SITE 069 HOLE A CORE R CORED 78.8-78. mbsf 069A-R ACCEORIES NANNOFOIL CLAYSTONE, CLAYSTONE, and CALEOUS SANDY SILTSTONE CC AGE: middle Eocene Major Lithologies: Greenish gray (G 6/) to moderate yellowish brown (0YR /) NANNOFOIL CLAYSTONE forms ~0% of the core, and moderate brown (YR /) CLAYSTONE and very light gray (N8) CALEOUS SANDY SILTSTONE each form ~0%. Minor Lithology: Very light gray (N8) to white (N9) FORAMINIFERAL SANDSTONE forms <% of the core. The core dominantly consists of upward darkening sequences ( to cm thick) of moderate brown CLAYSTONE overlying light colored NANNOFOIL CLAYSTONE. Very light gray CALEOUS SANDY SILTSTONE commonly occurs at the base of these sequences and is massive, wavy or planar laminated. Laminated FORAMINIFERAL SANDSTONE containing black lithic fragments occurs at the base of upward darkening sequences in Section, 0- cm, 67-70 cm, 88-9 cm, and 0- cm. The thickness of individual sandstone intervals is highly variable, ranging from very thin laminae, often disturbed by burrowing, to beds ~6 cm thick. An upward fining sequence occurs in Section, 00-0 cm. Within individual sequences the contact between the NANNOFOIL CLAYSTONE and the overlying CLAYSTONE is obscured due to bioturbation. Distinct burrow fills of CLAYSTONE occur in the upper part of the NANNOFOIL CLAYSTONE. Black laminae occur in Section, 0 cm and cm. SITE 069
6 SITE 069 HOLE A CORE R ACCEORIES CORED 78.-78. mbsf 069A-R SITE 069 CC IW CALEOUS CLAYSTONE and NANNOFOIL CLAYSTONE AGE: middle to early Eocene Major Lithologies: Greenish gray (GY 6/) CALEOUS CLAYSTONE and NANNOFOIL CLAYSTONE form ~60% of the core. Minor Lithologies: Moderate brown (YR /) CLAYSTONE forms ~0% of the core, light gray (N7) CALEOUS SANDY SILTSTONE forms ~%, and CALEOUS FORAMINIFERAL SANDSTONE forms <%. The core dominantly consists of thin bedded CLAYSTONE and CALEOUS CLAYSTONE and NANNOFOIL CLAYSTONE which is moderately bioturbated. Relatively undisturbed upward darkening sequences ( to cm thick) of CLAYSTONE overlying CALEOUS CLAYSTONE or NANNOFOIL CLAYSTONE and containing a CALEOUS SANDY SILTSTONE base occur in increasing frequency downcore. Parallel laminations sometimes occur in the CALEOUS SANDY SILTSTONE and in the overlying CALEOUS CLAYSTONE or NANNOFOIL CLAYSTONE. A cm thick CALEOUS FORAMINIFERAL SANDSTONE occurs at the base of an upwards darkening sequence in Section, 80 to 8 cm. Within individual sequences the contact between the CALEOUS CLAYSTONE or NANNOFOIL CLAYSTONE and the overlying CLAYSTONE is obscured due to bioturbation. Distinct burrow fills of CLAYSTONE occur in the upper part of the calcareous lithologies.
SITE 069 HOLE A CORE R CORED 78.-77.7 mbsf 069A-R ACCEORIES CC NANNOFOIL CLAYSTONE and CALEOUS SILTY SANDSTONE WITH NANNOFOILS AGE: middle to early Eocene Major Lithologies: Greenish gray (G 6/) to pale yellowish brown (0YR 6/) NANNOFOIL CLAYSTONE forms 60% of the core, and light gray (N7) to very light gray (N8) CALEOUS SILTY SANDSTONE WITH NANNOFOILS forms ~%. Minor Lithologies: Moderate brown (YR /) CLAYSTONE forms ~% of the core, and white (N9) NANNOFOIL SILTSTONE WITH FORAMINIFERS forms <%. The core is dominated by upward darkening sequences, - cm thick, of dark CLAYSTONE overlying NANNOFOIL CLAYSTONE, and a light colored base of CALEOUS SILTY SANDSTONE WITH NANNOFOILS. In Section, 00-0 cm, and Section, 8-0 cm, these sequences are relatively thin (< cm) and moderately bioturbated. In these intervals, sandstone bases are typically limited to thin bioturbated laminae or are absent. In the remainder of the core, upward darkening sequences have thicker ( to ~6 cm) sandstone bases, which are typically parallel, wavy or cross laminated. In Section, 6-7 cm, a climbing ripple structure is present in CALEOUS SILTY SANDSTONE WITH NANNOFOILS. Distinct CLAYSTONE caps are sometimes absent in individual sequences, occurring only as burrow fills near the top of the underlying NANNOFOIL CLAYSTONE. At the base of Section CC (0- cm), white NANNOFOIL SILTSTONE WITH FORAMINIFERS occurs, containing greenish gray laminae of NANNOFOIL CLAYSTONE. SITE 069 7
8 SITE 069 HOLE A CORE R ACCEORIES CORED 77.7-77. mbsf 069A-R SITE 069 CC NANNOFOIL CLAYSTONE and CALEOUS SANDY SILTSTONE WITH NANNOFOILS AGE: early Eocene Major Lithologies: Greenish gray (G 6/) to light brown (YR 6/) NANNOFOIL CLAYSTONE forms 60% of the core, and greenish gray (GY 6/) to light gray (N7) CALEOUS SANDY SILTSTONE WITH NANNOFOILS forms 0%. Minor Lithologies: Moderate brown (YR /) CLAYSTONE forms 0% of the core, and mottled gray CALEOUS SILTY SANDSTONE forms <%. A cm thick mottled white, brown, and black CONGLOMERATE occurs in Section, -6 cm. The core is dominated by thin bioturbated beds (-6 cm thick) of NANNOFOIL CLAYSTONE, CALEOUS SANDY SILTSTONE WITH NANNOFOILS and CLAYSTONE. Most lithological contacts between the calcareous lithologies are disturbed by drilling. Upward darkening sequences of these lithologies occur infrequently. Bioturbation typically obscures the contact between the NANNOFOIL CLAYSTONE and overlying CLAYSTONE, and sometimes CLAYSTONE is limited to burrow fills near the top of the NANNOFOIL CLAYSTONE. CALEOUS SANDY SILTSTONE WITH NANNOFOILS typically contains parallel laminations. In Section, - cm, fine to coarse-grained laminated CALEOUS SILTY SANDSTONE occurs.
SITE 069 HOLE A CORE R CORED 77.-767. mbsf 069A-R ACCEORIES CC NANNOFOIL CLAYSTONE and CALEOUS SANDY SILTSTONE AGE: early Eocene Major Lithologies: Greenish gray (GY 6/ to G 6/) NANNOFOIL CLAYSTONE forms 70% of the core, and light gray (N7) to greenish gray (G 6/) CALEOUS SANDY SILTSTONE forms 0%. Minor Lithologies: Moderate brown (YR /) CLAYSTONE forms <0% of the core. Because of the extreme drilling disturbance of the core, most of the lithologic contacts are disturbed. Upward-darkening sequences of CLAYSTONE, NANNOFOIL CLAYSTONE and massive or laminated CALEOUS SANDY SILTSTONE occur in Section, -6 cm, and 7-8 cm. Thinly bedded disturbed sequences of CLAYSTONE and NANNOFOIL CLAYSTONE form the majority of the core. Bioturbation is common in the CLAYSTONE and NANNOFOIL CLAYSTONE. Some burrows of Planolites(?) occur in Section at 6 cm and cm. SITE 069 9
0 SITE 069 HOLE A CORE 6R ACCEORIES CORED 767.-776.8 mbsf 069A-6R SITE 069 6 IW lt BR CLAYSTONE, CALEOUS CLAYSTONE, and NANNOFOIL CLAYSTONE AGE: early Eocene Major Lithologies: Moderate brown (YR /), light brown (YR /6), pale brown (YR /), and greenish gray (G 6/) CLAYSTONE forms ~60% of the core, and light greenish gray (G 8/) to light brown (YR /6) CALEOUS CLAYSTONE and NANNOFOIL CLAYSTONE form ~0%. Minor Lithologies: Light gray (N7) and medium gray (N) CALEOUS SANDY SILTSTONE forms <% of the core, and white (N9) and dark gray (N) CALEOUS SANDY SILTSTONE WITH FORAMINIFERS forms <%. 6 7 CC lt Section through Section, 7 cm, is dominated by bioturbated couplets (- cm) of moderate brown CLAYSTONE and lighter colored CALEOUS CLAYSTONE or NANNOFOIL CLAYSTONE. Thin laminae, lenses, or rarely thin beds, of CALEOUS SANDY SILTSTONE occur at the base of some of the couplets. Some upward darkening sequences (-9 cm thick) of these lithologies are distinguishable among the couplets. A thin bioturbated bed of pale brown CLAYSTONE occurs in Section, -7 cm. In Section, -7 cm, parallel laminated and sometimes inter-laminated CALEOUS SANDY SILTSTONE, CALEOUS SILTSTONE WITH FORAMINIFERS, and greenish gray CALEOUS CLAYSTONE occur. Possible flute casts occur at the base of a very thin CALEOUS SANDY SILTSTONE bed at cm. From Section, 7 cm through Section CC, 6 cm, moderate brown CLAYSTONE occurs, containing rare CLAEOUS SANDY SILTSTONE as laminae and bioturbated lenses. The laminae and lenses are typically rimmed by greenish gray CLAYSTONE.
SITE 069 HOLE A CORE 7R CORED 776.8-786. mbsf 069A-7R ACCEORIES 6 7 7 6 CC dk lt GY ol GY lt ol GY CLAYSTONE AGE: late Paleocene Major Lithology: Moderate brown (YR /) to greenish gray (G 6/) and olive gray (Y /) CLAYSTONE forms 7% of the core. Minor Lithologies: Light gray (N7) to white (N9) CALEOUS SANDY SILTSTONE forms ~0% of the core, and light brown (YR /6) to greenish gray (GY 6/) CALEOUS CLAYSTONE and light greenish gray NANNOFOIL CLAYSTONE form ~%. Sections - are dominated by bioturbated moderate brown CLAYSTONE, containing rare CALEOUS SILTSTONE and NANNOFOIL CLAYSTONE as laminae and bioturbated lenses. The laminae and lenses are typically rimmed by greenish gray CLAYSTONE. Thicker (- cm) CALEOUS SILTSTONE intervals occur in Section, 9- cm; Section, -8 cm, 0- cm, and 7-0 cm; and Section, 89-9 cm, -6 cm, and 8-0 cm. A series of bioturbated thin black laminae and lenses in Section, 0-0 cm, are correlated with high magnetic susceptibility measurements. Sections through CC are dominated by upward darkening sequences, some of which are also upward fining, of dark colored CLAYSTONE overlying lighter CALEOUS CLAYSTONE or NANNOFOIL CLAYSTONE. Light gray CALEOUS SILTSTONE bases are variable in thickness and are frequently absent. Sandstone lithologies throughout the core can be massive, bioturbated, wavy, parallel, or cross laminated, and sometimes contain laminae of greenish gray CLAYSTONE or CALEOUS CLAYSTONE. SITE 069
SITE 069 HOLE A CORE 8R ACCEORIES CORED 786.-796.0 mbsf 069A-8R SITE 069 6 8 CC dk dsk bl GN gy BR ye GY CLAYSTONE AGE: barren Major Lithology: Dusky blue green (BG /), dark greenish gray (GY /), grayish brown (YR /) and moderate brown (YR /) CLAYSTONE forms ~8% of the core. Minor Lithologies: Dark greenish gray (GY /) to light greenish gray (G 8/) CALEOUS CLAYSTONE forms <0% of the core. Yellowish gray (Y 8/) CALEOUS SANDSTONE forms ~% of the core. Thin to medium bedded CLAYSTONE dominates the core. Only rare sequences of CLAYSTONE underlain by CALEOUS CLAYSTONE are discernible in Section, 0-9 cm, because of bioturbation and also because the different lithologies are similar in color in this interval. The color changes from dominantly green-gray to dominantly brown below Section, cm. In Section, 9-9 cm, four beds, -9 cm thick, of CALEOUS SANDSTONE occur, intercalated by millmeter-thick dark greenish gray CLAYSTONE or CLAEOUS CLAYSTONE. The lowermost CALEOUS SANDSTONE bed consists of fine to medium sand with clayey, silty laminae. Four massive coarse grained CALEOUS SANDSTONE beds occur in Section, 9-0 cm, which are separated by thin claystone laminae. Elongated grains in these sandstones are subparallel to bedding.
SITE 069 HOLE A CORE 9R CORED 796.0-80.6 mbsf 069A-9R ACCEORIES IW CLAYSTONE AGE: middle Paleocene Major lithology: Dark reddish brown (0R /), moderate reddish brown (0R /6) and dark greenish gray (GY /) CLAYSTONE forms ~8% of the core. 9 CC lt dk rd BR Minor Lithologies: Dark greenish gray (GY /) to greenish gray (GY 6/) CALEOUS CLAYSTONE and light gray (N7) to greenish gray (GY 6/) CALEOUS CLAYEY SILTSTONE to SANDY SILTSTONE each form <0% of the core. CALEOUS SANDSTONE forms ~ % 0f the core. The core is dominated by upward-darkening sequences (typically -0 cm thick, and exceptionally cm) consisting of lighter colored CLAYSTONE or CALEOUS CLAYSTONE overlain by darker colored CLAYSTONE. In Section, Section, 0-0 cm, and Section, 0-0 cm the upper CLAYSTONE in individual sequences is greenish gray in color; elsewhere it is reddish brown. Many of the upward-darkening sequences contain thin (< mm) parallel laminated intervals of CALEOUS CLAYEY SILTSTONE to SANDY SILTSTONE. These laminae are sometimes disrupted or lenticular. A few thicker (- cm) intervals of CALEOUS SANDY SILTSTONE also occur, containing burrows and/or disrupted laminae, and become more common downhole. In Section two beds of well cemented CALEOUS SANDSTONE occur at 0- cm and -6 cm. Both show parallel lamination, and the upper one contains a normal fault confined to the middle part of the bed. In Section, 76-90 cm, an interval of heterogeneous CALEOUS SANDSTONE occurs. Slightly concave-up parallel laminae occur near its base, above which occurs a curved erosional surface. This is overlain by a coarse to fine grained, normally graded lithic CALEOUS SANDSTONE. A mm zone of microfaulting occurs at the top of the lithic CLAEOUS SANDSTONE and can be traced upwards into the overlying CALEOUS CLAYSTONE. SITE 069
SITE 069 HOLE A CORE 0R ACCEORIES CORED 80.6-8. mbsf 069A-0R SITE 069 6 7 8 9 0 8 7 6 CC med rd BR med rd BR CALEOUS CLAYSTONE, CLAYSTONE, and CALEOUS SANDSTONE AGE: early Paleocene Major Lithologies: Moderate brown (YR /) to greenish gray (GY 6/) CALEOUS CLAYSTONE forms ~0% of the core, moderate reddish brown (0R /6) CLAYSTONE forms ~0%, and very light gray (N8) to yellowish gray (Y 8/) CALEOUS SANDSTONE forms ~%. Minor Lithology: Greenish gray (G 6/) to light gray (N7) CALEOUS SILTSTONE forms ~% of the core. Four distinct lithologic associations are present in the core: () ~ 0 cm thick sequences of CALEOUS SANDSTONE at the base, followed by CALEOUS SILTSTONE, CALEOUS CLAYSTONE and CLAYSTONE; () medium to thin bedded sequences of laminae or thin layers of CALEOUS SILTSTONE as the basal layer, followed by CALEOUS CLAYSTONE and CLAYSTONE; () thin bedded CALEOUS CLAYSTONE and CLAYSTONE sequences; () CLAYSTONE separated by CALEOUS SILTSTONE laminae. Bioturbation occurs dominantly in the CLAYSTONE and CALEOUS CLAYSTONE and CALEOUS SILTSTONE beds, but in some cases thin CALEOUS SANDSTONE beds are disrupted by Planolites(?) burrows. CALEOUS SANDSTONE in Section, 69-7 cm, Section 7, -6 cm, and Section 8, - cm, show nearly vertical stylolite planes. CALEOUS SANDSTONE in Section, -7 cm, and 8-9 cm, form the base of complete upward darkening sequences and show features typical of Bouma Sequence units Ta (massive bedding), Tb (parallel lamination), and Tc (cross bedding). The overlying CALEOUS SILTSTONE or CALEOUS CLAYSTONE and CLAYSTONE correspond to Bouma units Td and Te. Sections 7 and 8 were recovered in a separate core barrel from Sections -. As a result part of Sections 7 and 8 may overlap with Sections and 6.
SITE 069 HOLE A CORE R CORED 8.-8.0 mbsf 069A-R ACCEORIES CC vlt GY vlt GY CLAYSTONE AGE: early Paleocene Major Lithology: Moderate brown (YR /) CLAYSTONE forms 80% of the core. Minor Lithologies: Very light gray (N8) to white (N9) CALEOUS SANDSTONE forms 0% of the core. Greenish gray (GY 6/) and moderate brown (YR /) to light brown (YR 6/) CALEOUS CLAYSTONE to CALEOUS CHALK, and dark greenish gray (GY /) CALEOUS SILTY CLAYSTONE each form ~% of the core. Three lithological associations are present in the core: () thin upward-darkening sequences (- cm) in which either CALEOUS SILTY CLAYSTONE or CALEOUS CLAYSTONE to CALEOUS CHALK is capped by CLAYSTONE; () thick intervals (as much as m) of CLAYSTONE containing thin (< cm) beds of either CALEOUS CLAYSTONE or CALEOUS SILTY CLAYSTONE; and () to cm thick beds of CALEOUS SANDSTONE. Many of the CALEOUS SANDSTONE beds are normally graded, and most show parallel, planar and trough cross laminae of alternating SANDSTONE and greenish gray SILTY or CLAYEY SANDSTONE. Parallel, interlaminated and slightly bioturbated intervals (< cm thick) of CALEOUS SILTY CLAYSTONE and CALEOUS SANDSTONE occassionally occur above the CALEOUS SANDSTONE beds. These interlaminated intervals are sometimes overlain by bioturbated CALEOUS CLAYSTONE up to cm thick. Thin bioturbated CALEOUS CLAYSTONE may also occur directly above some CALEOUS SANDSTONE beds. SITE 069
6 SITE 069 HOLE A CORE R ACCEORIES CORED 8.0-8.7 mbsf 069A-R SITE 069 CALEOUS SANDSTONE, CALEOUS CLAYSTONE and CALEOUS CHALK Age: barren 6 7 8 6 CC IW lt GY lt GY lt BR Major Lithologies: Light gray (N7) to white (N9) CALEOUS SANDSTONE forms 0% of the core and moderate brown (YR /) to light brown (YR 6/) CALEOUS CLAYSTONE to CALEOUS CHALK forms ~0%. Minor Lithologies: Moderate brown (YR /) CLAYSTONE forms ~% of the core, light gray (N7) to greenish gray (GY 6/) CALEOUS SILTSTONE forms ~%, and light brown (YR 6/) to very pale orange (0YR 8/) NANNOFOIL CHALK forms ~%. Mottled white (N9), dark greenish gray (GY /), and dark gray (N) CONGLOMERATE forms <% of the core. The following changes in lithological assemblages occur in the core (starting at the base): From Section CC, 7 cm to Section, 7 cm, poorly developed thin upward-darkening sequences occur in which either CALEOUS SILTSTONE or CALEOUS CLAYSTONE to CALEOUS CHALK is capped by CLAYSTONE. Within this interval, and also in Section, 78-90 cm, and Section, -8 cm, CLAYSTONE dominated successions up to 0 cm thick occur. NANNOFOIL CHALK occurs at the bases of three upward-darkening sequences between Section, cm, and Section, cm. Two types of CALEOUS SANDSTONE are present above Section, 69 cm in the core. One is white, and the other has a salt and pepper appearance due to the presence of dark green clasts. Both types occur in beds between and cm thick. Some of them are normally graded, and most show parallel, planar and trough cross laminae of alternating sandstone and greenish gray silty or clayey sandstone. Thin upward-darkening sequences occur above some of the CALEOUS SANDSTONES. They consist of bioturbated CALEOUS CLAYSTONE capped by CLAYSTONE. A lithic CONGLOMERATE containing dark green meta-basic and light colored limestone clasts up to 0. cm across occurs in Section 6, - cm.
SITE 069 HOLE A CORE R CORED 8.7-8. mbsf 069A-R ACCEORIES 6 7 CC mlt GY mlt GY CLAYSTONE and SILTY CLAYSTONE AGE: Cretaceous Major Lithology: Moderate reddish brown (YR 6/) and rarely greenish gray (GY 6/) CLAYSTONE and SILTY CLAYSTONE form ~60% of the core. Minor Lithologies: Moderate brown (YR /) to light brown (YR 6/) and rarely greenish gray (GY 6/) CALEOUS CLAYSTONE forms ~0% of the core, light gray (N7) to white (N9) CALEOUS SILTSTONE forms ~%, and yellowish gray (Y 8/) CONGLOMERATE and very light gray (N8) to white (N9) SANDSTONE each form <%. The core is dominated by thin bedded, moderate reddish brown CLAYSTONE to SILTY CLAYSTONE containing very thin bioturbated beds (< cm) or laminae of greenish gray CLAYSTONE or CALEOUS CLAYSTONE and light gray laminae of CALEOUS SILTSTONE. CALEOUS SILTSTONE beds, -0 cm thick, occur interbedded with the CLAYSTONE in Sections through CC. These siltstone beds are parallel or cross laminated, and sometimes contain greenish gray CLAYSTONE or CALEOUS CLAYSTONE laminae. Bioturbation is common at the top of individual SILTSTONE beds. Poorly developed, thin (-0 cm) upward darkening sequences of either CALEOUS SILTSTONE or CALEOUS CLAYSTONE overlain by CLAYSTONE occur from Section, 7 cm, to Section, 0 cm. Throughout the core CLAYSTONE and CALEOUS CLAYSTONE lithologies are well mixed by bioturbation. In Section, 7- cm, a CONGLOMERATE containing shallow water limestone and dark colored basement(?) clasts occurs. At the base of Section CC, a SANDSTONE of similar composition occurs. SITE 069 7
8 SITE 069 HOLE A CORE R ACCEORIES CORED 8.-8.0 mbsf 069A-R SITE 069 CLAYSTONE 6 7 6 CC mlt GY AGE: barren Major Lithology: Moderate brown (YR /) to moderate reddish brown (YR 6/) and rarely greenish gray (GY 6/) CLAYSTONE forms 6% of the core. Minor Lithologies: Moderate brown (YR /), light brown (YR 6/) and rarely greenish gray (GY 6/) CALEOUS CLAYSTONE forms % of the core. Moderate brown (YR /), dark yellowish brown (0YR /), and light gray (N7) to greenish gray (GY 6/) CALEOUS CLAYEY SANDSTONE, and very light gray (N8) to light gray (N7) CALEOUS SILTSTONE each form 0% of the core. A mottled white (N9) and dark gray (N) CONGLOMERATE forms <% of the core. The core is dominated by thinly bedded brown CLAYSTONE, containing very thin bioturbated beds (< cm) or laminae of greenish gray CLAYSTONE or CALEOUS CLAYSTONE and light gray laminae of CALEOUS SILTSTONE. CALEOUS CLAYEY SANDSTONE beds, - cm thick, occur interbedded with the CLAYSTONE in all sections, but are thickest in Sections and. These sandstone beds are typically massive, but occasionally parallel, wavy or cross laminated, and bioturbated. They sometimes contain greenish gray CLAYSTONE or CALEOUS CLAYSTONE laminae. Poorly developed, thin (-0 cm) upward darkening sequences with a base of CALEOUS SILTSTONE or CALEOUS CLAYEY SANDSTONE, overlain by CALEOUS CLAYSTONE, and capped by CLAYSTONE occasionally occur in Sections through. CLAYSTONE and CALEOUS CLAYSTONE lithologies are often well mixed by bioturbation. In Section, -7 cm, an upward fining and darkening sequence occurs with CONGLOMERATE at the base.
SITE 069 HOLE A CORE R CORED 8.0-86.6 mbsf 069A-R ACCEORIES CC IW mlt GY lt ye GY mlt GY CALEOUS SILTY SANDSTONE, CALEOUS SANDSTONE, CALEOUS CLAYSTONE, NANNOFOIL CHALK, and CLAYSTONE AGE: late Campanian Major Lithology: Light gray (N7), pale yellowish brown (0YR 6/) and mottled white (N9) and medium gray (N) CALEOUS SILTY SANDSTONE and CALEOUS SANDSTONE form ~% of the core. Moderate brown (YR /) to light brown (YR 6/) and greenish gray (GY 6/) CALEOUS CLAYSTONE and NANNOFOIL CHALK form ~% of the core, and moderate brown (YR /) CLAYSTONE forms 0%. The core is dominated by upward darkening sequences (-0 cm thick) of CALEOUS SANDSTONE or CALEOUS SILTY SANDSTONE overlain by CALEOUS CLAYSTONE or NANNOFOIL CHALK, and capped by CLAYSTONE. CLAYSTONE and the underlying calcareous lithologies are often well mixed by bioturbation in thinner sequences. The basal sandstone lithology is variable in thickness, often limited to thin bioturbated laminae, or is absent. However, medium to coarse-grained CALEOUS SILTY SANDSTONE and CALEOUS SANDSTONE beds, - cm thick increasingly occur downcore, some of which are part of upward darkening and upward fining sequences. These sandstone beds are typically massive, but occasionally parallel, wavy or cross laminated, and bioturbated. Interbedded with thick sandstone lithologies in Section are intervals dominated by thin bedded CLAYSTONE, containing very thin bioturbated beds (< cm) or laminae of greenish gray CLAYSTONE or CALEOUS CLAYSTONE and rare light gray laminae of CALEOUS SILTSTONE. SITE 069 9
0 SITE 069 HOLE A CORE 6R ACCEORIES CORED 86.6-87. mbsf 069A-6R SITE 069 6 CC pal BR pal ye BR med ye BR dsk YE NANNOFOIL CHALK and SANDSTONE AGE: Late Jurassic Major Lithologies: Mottled dusky yellow (Y 6/) to light olive brown (YR /6) NANNOFOIL CHALK forms ~60% of the core, and pale brown (YR /) and pale yellowish brown (0YR 6/) CALEOUS SANDSTONE forms ~%. Minor Lithologies: Moderate reddish brown (0R /6) to moderate brown (YR /) CLAYSTONE form ~0%, and greenish gray (GY 6/) CALEOUS CLAYSTONE, light gray (N7) CALEOUS SILTSTONE, light gray (N7) BOUNDSTONE, medium dark gray (N) CLAY, and grayish brown (YR /) CLAYSTONE form the remainder of the core. CLAYSTONE, CALEOUS CLAYSTONE, and CALEOUS SILTSTONE occur in Section, 0-0 cm, 0-6 cm, 76-78 cm, -0 cm, 8-0 cm, and Section, 0- cm. Complete upward-darkening sequences do not occur. Section, 0-0 cm, 0-76 cm, 78- cm, and 0-8 cm are dominated by massive, sometimes fining-upward CALEOUS SANDSTONE. Mud clasts (possibly burrows?) of CLAYSTONE and CALEOUS CLAYSTONE occur in these sandstones. From Section, cm to Section, 6 cm, a massive NANNOFOIL CHALK occurs. Rare irregular and disrupted bedding structures dip ~0-0 and are sometimes crosscut by faint sub-horizontal color bands. Shell fragments occur in Section, - cm, 9 cm, and 06-07 cm. Faults occur in Section, 9-6 cm. In Section, 6- cm, the NANNOFOIL CHALK is darker and more mottled in color, and disturbed by slumping. Sand and gravel-sized basement(?) clasts are mixed with the nannofossil chalk in the slumped interval. In Section, - cm a dark gray CLAY occurs which is strongly disturbed. At the top of this CLAY a carbonate clast occurs. In the core catcher an ~8 x cm piece of BOUNDSTONE occurs. The BOUNDSTONE contains a spirit level structure fill within a indicting that the limestone piece is a large clast, or part of bivalve, in which the sparite/micrite boundary is vertical, a clast.
SITE 069 HOLE A CORE 7R CORED 87.-88.9 mbsf 069A-7R ACCEORIES 7 vlt GY vlt gy GY gn BK GRAINSTONE, RUDSTONE, BOUNDSTONE AND METASEDIMENT AGE: barren Major Lithologies: The core consists of pieces of very light gray (N8) to very pale orange (0YR 8/) GRAINSTONE, RUDSTONE, and BOUNDSTONE, and pieces of dark greenish gray (G /) to greenish black (GY /) METASEDIMENT. Pieces -8 (Section, 0- cm) and 0 (which may be a small roller out of sequence in the core) all consist of the limestone lithologies which contain clasts that vary in size from medium sand to large pebbles. The clasts are predominantly allochems and carbonate lithoclasts (coated grains, oncoids, skeletal debris, cryptalgal fragments, Chaetitid sponges, coral and other frame building organisms, plus occasional clasts of peloid grainstone), with scattered metasediment clasts up to mm across. Piece 8 is a breccia containing subrounded to subangular clasts (up to. cm) of metasedimentary rocks and boundstone set in a carbonate (possibly calcite and dolomite) matrix which contains fine sand to granule-sized angular metasediment clasts and pyrite grains. Pieces 9- (with the exception of 0 and 8 described above), and similar ones in Cores 069A-8R through -R, are metasiltstone, meta-arkose wacke amd dolomitic meta-arkose, showing lower greenschist facies metamorphism. Bedding (including cross bedding) is defined by darker and lighter gray layers. Foliation is oblique to the layers, and pyrite grains are aligned parallel to the foliation. The rocks contain quartz, plagioclase, muscovite and chlorite, and some are carbonate-rich. Pieces and look like pebble sized clasts. They have rounded outer smooth surfaces that do not show any percussion marks, which would suggest that the smooth surfaces were not created by drilling. SITE 069
SITE 069 HOLE A CORE 6G ACCEORIES CORED 767.0-99. mbsf 069A-6G SITE 069 6 dk LITHIC SAND AGE: not applicable Major Lithology: Dark greenish gray (G /) to grayish yellow (Y 8/) LITHIC SAND Minor Lithology: Yellowish gray (Y 8/)NANNOFOIL OOZE The medium to coarse grained LITHIC SAND consists of poorly sorted subangular to subrounded clasts of quartz and dark greenish gray meta-sediment basement clasts. The sand grains are mixed with a yellowish gray NANNOFOIL OOZE.
SITE 069 cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit Structure Measurement ID 7-069A-7R- UNIT V: META-ARKOSIC WACKE Pieces 9, -6, 0, and : Grayish black (N), medium dark gray (N) and dark greenish gray (GY /). METAMORIC STRUCTURES: Slightly foliated. 6 MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz -80 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite -0 <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic core photo 0 7 8 9 0 UNIT V Vc VEINS: <%, pyrite and quartz. ADDITIONAL COMMENTS: Piece very fine-grained with coarser grained cross beds. Piece void space (after pyrite?). Piece 6 is relatively coarse-grained. Piece contains (reduction?) rings around pyrite(?) 6 CL: 090/0 7 Paleo 00 8 9 Paleo 0 0 CORE/SECTION
SITE 069 7-069A-8R- core photo cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID UNIT V: META-ARKOSIC WACKE Pieces - : Dark gray (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 70-8 < anhedral detrital plagioclase - < anhedral detrital muscovite -0 <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic pyrite < <0. euhedral VEINS: <%, pyrite and quartz. Veins parallel to foliation. ADDITIONAL COMMENTS: Ovoid structures contain pyrite and/or quartz in pieces and. Pyrite appears oxidized in Piece. 0 00 0 CORE/SECTION
SITE 069 core photo cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID 7-069A-9R- UNIT V: METASILTSTONE AND META-ARKOSIC WACKE Pieces and : Grayish black (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. Foliation intersects relict bedding in Piece. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 70 < anhedral detrital plagioclase < anhedral detrital muscovite 0 <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic opaque mineral? <0. euhedral VEINS: 0 ADDITIONAL COMMENTS: Piece is a metasiltstone, and Piece is a very fine-grained meta-arkosic wacke. Pyrite absent? 00 0 CORE/SECTION
SITE 069 core photo cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID So,CL So,CL So,CL 7-069A-0R- UNIT V: META-ARKOSIC WACKE Pieces - : Grayish black (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. Foliation intersects relict bedding in Piece. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 60-70 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite - <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic VEINS: <%, pyrite and quartz. Veins cut foliation. Comments: Pyrite also occurs in isolated masses and with felsic minerals in ovoid pods (deformed burrows?). 0 ADDITIONAL COMMENTS: Relict bedding in Piece. Ovoid structures contain pyrite and/or quartz. Some hollow and lined with euhedral crystals. 00 0 CORE/SECTION 6
SITE 069 cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit Structure Measurement ID So,CL 7-069A-R- UNIT V: META-ARKOSIC WACKE Pieces -0 : Grayish black (N) to medium dark gray (N) METAMORIC STRUCTURES: Slightly foliated. Foliation intersects relict bedding in Pieces and. core photo 0 6 7 8 8 0 UNIT V CL CL CL CL Vc MINERALOGY: Orig. Mineral Mode Size Shape Commens Name (%) (mm) quartz 0-70 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic VEINS: <%, pyrite and quartz. Veins cut foliation. Comments: Pyrite also occurs with felsic minerals in ovoid pods (deformed burrows?). ADDITIONAL COMMENTS: Relict bedding in Piece. Drilling disturbance in Piece 8. Ovoid structures contain pyrite and/or quartz. Some ovoid structures are hollow and lined with euhedral crystals. Paleo 00 0 CORE/SECTION 7
SITE 069 core photo cm 0 Piece number A B 6 Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID So,CL So,CL Vc So,Vc 7-069A-R- UNIT V: META-ARKOSIC WACKE Pieces -6 : Grayish black (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 0-70 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic VEINS: <%, pyrite and quartz. Veins cut foliation. Comments: Pyrite more abundant than in Sections 0R- and R-. Pyrite also occurs with felsic minerals in ovoid pods (deformed burrows?). 0 ADDITIONAL COMMENTS: Ovoid structures contain pyrite and/or quartz. Some ovoid structures are hollow and lined with euhedral crystals. 00 0 CORE/SECTION 8
SITE 069 core photo cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID 7-069A-R- UNIT V: DOLOMITIC METASILTSTONE Pieces : Greenish black (G /). METAMORIC STRUCTURES: Slightly foliated. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 60 < anhedral detrital plagioclase 0 < anhedral detrital muscovite <0. anhedral platy, metamorphic dolomite 0 <0. euhedral small, elongate grains chlorite <0. anhedral platy, metamorphic VEINS: No veins. 0 ADDITIONAL COMMENTS: Pyrite occurs in a few isolated masses. Relict lamination. Ovoid structures absent. 00 0 CORE/SECTION 9
SITE 069 core photo cm 0 Piece number Graphic Representation Orientation UNIT V Shipboard studies Lithologic unit Structure Measurement ID CL 7-069A-R- UNIT V: META-ARKOSIC WACKE Pieces - : Grayish black (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 0-70 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic VEINS: <%, Pyrite and quartz veins. Comments: Pyrite also occurs in ovoid structures with felsic minerals (deformed burrows?). 0 ADDITIONAL COMMENTS: Relict lamination. Drilling disturbance in Piece. Ovoid structures contain pyrite and/or quartz. Some ovoid structures are hollow and lined with euhedral crystals. 00 0 CORE/SECTION 60
SITE 069 core photo cm 0 Piece number Graphic Representation Orientation Shipboard studies Lithologic unit UNIT V Structure Measurement ID CL So,CL 7-069A-R- UNIT V: META-ARKOSIC WACKE Pieces and : Grayish black (N) to medium dark gray (N). METAMORIC STRUCTURES: Slightly foliated. MINERALOGY: Orig. Mineral Mode Size Shape Comments Name (%) (mm) quartz 0-70 < anhedral detrital plagioclase 0-0 < anhedral detrital muscovite <0. anhedral platy, metamorphic chlorite <0. anhedral platy, metamorphic VEINS: No veins. 0 ADDITIONAL COMMENTS: Pyrite occurs in ovoid structures with felsic mineral(s). Some structures hollow and lined with euhedral pyrite and quartz. Relict bedding and cross-bedding in Piece. 00 0 CORE/SECTION 6