a Globigerinoides trilobus trilobus I Globigerinoides altiaperturus.

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Annales de la Societe Geologique de Belgique, T. 103-1980, pp. 55-61 decembre 1980 NOTE ON THE STRATIGRAPHIC POSITION OF THE ZONDERSCHOT SANDS MEMBER OF THE BERCHEM FORMATION (MIOCENE, BELGIUM) 1 by H.J.F. HOOYBERGHS 2 ( 1 table and 1 plate) RESUME.- Trois echantillons de la localite type des Sables de Zonderschot, Formation de Berchem, contiennent 15 especes de foraminiferes planctoniques. L'association des foraminiferes planctoniques indique une Biozone provinciale a Globigerinoides trilobus trilobus I Globigerinoides altiaperturus. ABSTRACT.- Planktonic foraminifera are recorded from three samples of the Zonderschot Sands Member of the Berchem Formation in the type locality at Zonderschot. Altogether 15 taa are described. The association of planktonic foraminifera indicates a provincial Globigerinoides trilobus trilobus / Globigerinoides altiaperturus Biozone. 1.- INTRODUCTION In a temporary ecavation for a new pipe line at Zonderschot (Heist-op-den-Berg; X = 176,50, Y = 194,60) a 60 cm thick layer of glauconiferous and very fossiliferous sand was visible in 1972 between the underlying eroded Boom Clay and 3,5 m Quaternary sand. The dark green clayey and micaceous sand has been defined as the Zonderschot Sands Member of the Berchem Formation (DE MEUTER & LAGA, 1976). This contribution deals with the planktonic foraminifera recorded from three samples of these Zonderschot Sands in the type locality (B 327, B 328, B 329), taken every 20 cm from the base to the top of the 20 cm thick deposit. II.- STRATIGRAPHY The distribution of the planktonic foraminif era in the Zonderschot Sands samples is represented in table 1. The populations are dominated by Globigerina angustiumbilicata and by taa of the Globigerina praebulloides group. Some less frequently occuring taa however are more important in a biostratigraphical point of view. Especially the presence of Globorotalia zealandica incognita, Globigerinoides trilobus trilobus and Globigerinoides altiaperturus are interesting. The association of planktonic foraminifera within the Zonderschot Sands can be considered as a Globigerinoides trilobus trilobus / Globigerinoides altiaperturus Concurrent Range Zone. Some other important taa as f.i. Globigerinatella insueta and Globigerinita dissimilis have not yet been observerd in the Zonderschot Sands. The association of planktonic foraminifera within the Zonderschot Sands resembles this of the higher part of the Houthalen Sands (HOOYBERGHS & DE MEUTER, 1972). Globigerinoides trilobus trilobus and Globigerinoides altiaperturus also occur together in this part. Globorotalia zealandica incognita however is recorded first from the Zonderschot Sands. The stratigraphic gap between the Zonderschot Sands and the older Houthalen Sands (Burdigalian) appears to be very restricted. The correlation of the planktonic foraminiferal association in the Zonderschot Sands with those of the Antwerpen Sands still has to be worked out in detail. Globorotalia zealandica incognita also occurs in the Antwerpen Sands. It has been described as Globorotalia sp. by HOOYBERGHS & DE MEUTER (1972). I Communication re~ue et presentee le 8 juillet 1980. 2 Afdeling Historische Geologie, Lab. micropaleontologie, KUL, Redingenstraat, 16 b, B-3000 LEUVEN.

J 56 HJ.F. HOOYBERGHS Table 1.- Distribution of planktonic foraminifera in the Zonderschot Sands samples. ( X = less than 1 o /o of the population) B237 60 l 6 9 18 2 4 B238 B 239 l l 69 68 2 4 5 2 4 6 12 17 3 2 3 l Globorotalia obesa BOLLI, 1957 Globorotalia praescitula BLOW, 1959 Globorotalia zealandica incognita WALTHERS, 1965 Globigerina angustiumbilicata BOLLI, 1957 Globigerina bulloides D'ORBIGNY, 1826 Globigerina ouachitaensis HOWE & WALLACE, 1932 Globigerina praebulloides leroyi BLOW & BANNER, 1962 Globigerina praebulloides occlusa BLOW & BANNER, 1962 Globigerina praebulloides praebulloides BLOW, 1959 Globigerina woodi JENKINS, 1962 Globigerinoides altiaperturus BOLLI, 1957 Globigerinoides quadrilobatus (D'ORBIGNY, 1846) Globigerinoides trilobus trilobus (REUSS, 1850) Globigerinoides trilobus immaturus LEROY, 1939 Globigerinita unicava unicava (BOLLI, LOEBLICH & TAPPAN, 1957) III.- SYSTEMATICS Family Globorotaliidae CUSHMAN, 1927 Subfamily Globorotaliinae CUSHMAN, 1927 Genus Globorotalia CUSHMAN, 1927 Globorotalia obesa BOLLI, 1957 + 1957 Globorotalia obesa Bolli, new species - BOLLI, p. 119, pl. 29: 2a - 3. v 1972 Globorotalia obesa BOLLI - HOOYBERGHS & DE MEUTER, p. 13, pl. 1 : Sa - c. A few specimens have an aperture etending over the dorsal peripheral margin of the preceeding whorl. They show a transition to Hastigerina siphonifera praesiphonifera BLOW, 1969, with at least three consecutive planispiral chambers. Globorotalia praescitula BLOW, 1959 + 1959 Globorotalia scitula praescitula Blow, subsp. nov. -BLOW, p. 221, pl. 19 : 128a - c. Besides typical specimens, individuals with a more rounded aial periphery occur. Globorotalia zealandica incognita WALTERS, 1965 Pl. l : 3 + 1958 Globorotalia zealandica Hornibrook subsp. incognita Walters - WALTHERS, p. 120, tf. 6a -j (Fide ELLIS & MESSINA). Globorotalia zealandica incognita is characterized by the small compact and thick-walled test. Some of our specimens have a finely perforated last chamberlet. Family Globigerinidae CARPENTER, PARKER & JONES, 1862 Subfamily Globogerininae CARPENTER, PARKER & JONES, 1862 Genus Globigerina D'ORBIGNY, 1826 Globigerina angustiumbilicata BOLLI, 1957 Pl. 1 : 5 + 1957 Globigerina ciperoensis angustiumbilicata Bolli, new subspecies - BOLLI, p. 109, pl. 22: 12a Bc. v 1972 Globigerina angustiumbilicata Bolli - HOOY BERGHS & DE MEUTER, p. 17, pl. 3: 4a - c.

NOTE ON THE STRATIGRAPHIC POSITION OF THE ZONDERSCHOT SANDS MEMBER OF THE BERCHEM FORMATION 57 Some specimens have an asymmetrical aperture etending from the umbilicus to the peripheral margin. Globigerlna bulloides D'ORBIGNY, 1826 Pl.I: 4 + 1826 Globigerina bulloides d'orbigny - d'orbigny, p. 277. v 1972 Globigerina bulloides D'Orbigny - HOOY- BERGHS & DE MEUTER, p. 18, pl. 4 : 2a-c. A few individuals, having a larger aperture, resemble Globigerina apertura CUSHMAN, 1918. Globigerina ouachitaensis HOWE & WALLACE, 1932 Pl.I : 6 + 1932 Globigerina ouachitaensis Howe & Wallace - HOWE & WALLA CE - HOOYBERGHS & DE MEUTER, p. 23, pl. 6: 3a - c. Rarely occuring smaller individuals resemble Globigerina of[icinalis SUBBOTINA, 1953. Globigerina praebulloides leroyi BLOW & BANNER, 1972 Pl.I: 9 + 1962 Globigerina praebulloides leroyi Blow & Banner subsp. nov. - p. 93, pl. IX R -T : 9(v). v 1972 Globigerina praebulloides leroyi Blow & Banner - HOOYBERGHS & DE MEUTER, p. 24, pl. 7 : 2a - c. The typical specimens have a symmetrical semicircular aperture bordered by a small lip. Globigerina praebulloides occlusa BLOW & BANNER, 1962 + 1962 Globigerina praebulloides occlusa Blow & Banner subsp. nov. -:- BLOW & BANNER, p.93,pl.ixv-w: 14i-ii. v 1972 Globigerina praebulloides occlusa Blow & Banner - HOOYBERGHS & DE MEUTER, p. 25, pl. 7 : 3a - c. The asymmetrical aperture lacks a lip. Globigerina praebulloides praebulloides BLOW, 1959 Pl. 1 : 8 + 1959 Globigerina praebulloides Blow, sp. nov. - BLOW, p. 180, pl. 8 : 47a-c, pl. 9 : 48. v 1972 Globigerina praebulloides praebulloides Blow HOOYBERGHS & DE MEUTER, p. 25, Pl. 7 4a-c. Typical individuals with a relative large asymmetrical aperture occur rarely in our samples. Globigerina woodi JENKINS, 1960 Pl. 1 : 7 + 1960 Globigerina woodi Jenkins, new species - JENKINS, p. 352, pl. 2 : 2a - c. v 1972 Globigerina woodi Jenkins -HOOYBERGHS & DE MEUTER, p. 27, Pl. 8: 4a - c. The size of the aperture varies considerably. Genus Globigerinoides CUSHMAN, 1927 G/obigerinoides altiaperturus BOLLI, 1957 Pl. 1 : 10, 11 + 1957 Globigerinoides triloba altiapertura Bolli, new subspecies - pl. 25 : 7a - 8, tet-fig. 21, nr 3. v 1972 Globigerinoides quadrilobatus altiaperturus Bolli - HOOYBERGHS & DE MEUTER, p. 28, pl. 9 : 2a - c. The rarely occurring specimens have typically highly arched primary and secondary apertures.

58 HJ.F. HOOYBERGHS Globigerinoides quadrilobatus BANNER & BLOW, 1960 Pl. 1 : 12. + 1960 Globigerinoides quadrilobatus (d'orbigny) - BANNER & BLOW, p. 17, pl. 4 : 3a - b. v 1972 Globigerinoides quadrilobatus quadrilobatus Banner & Blow - HOOYBERGHS & DE MEUTER, p. 29, pl. 9: 4a - c. The typical specimens have 3 1/2 chambers in the last whorl. Globigerinoides trilobus immaturus (LE ROY, 1939) Pl. 1 : 14 + 1939 Globigerinoides sacculiferus (Brady), var. immatura Le Roy - LE ROY, p. 263, pl. 3 19-21 (Fide ELLIS & MESSINA). wall. Some specimens have a very coarsely cancellated Globigerinoides trilobus trilobus (REUSS, 1850) Pl. 1 : 13 + 1850 Globigerina triloba Reuss - REUSS, p. 374, pl. 47 : l la - b. v 1972 Globigerinoides trilobus (Reuss) - HOOY BERGHS & DE MEUTER, p. 30, pl. 10 2a - c. Typical specimens have 3 chambers in the last whorl, but the embracing character of the chambers varies slightly. Globigerinita unicava unicava (BOLLI, LOEBLICH & TAPPAN, 1957) Pl. 1 : 15 + 1957 Catapsydra unicavus Bolli, Loeblich & Tappan, new species - BOLLI, LOEBLICH & TAPPAN, p. 37, pl. 7: 9a - c. v 1972 Globigerinita unicava unicava Bolli, Loeblich & Tappan - HOOYBERGHS & DE MEUTER, p. 33, pl. 11 : 4a - c. The size of the umbilical bulla varies but is mostly rather small. IV.- ACKNOWLEDGEMENTS Sincere thanks are due to Professor BULTYNCK, Professor BOUCKAERT, Professor GULLENTOPS and to Dr. DE MEUTER for their critical and instructive advise and for their permissing to study the samples of the Zonderschot Sands. Thanks are also due to Professor KING for the reading of the manuscript. The author thanks Dr. WO UTE RS (Koninklijk Belgisch Instituut voor Natuurwetenschappen) for making the photographs of the specimens. BIBLIOGRAPHY BANNER, F.T. & BLOW, W.H., 1960. Some primary types of species belonging to the Superfamily Globigerinacea. Contrib. Cushm. Found. Foram. Res., II (1): 1-41, 8 pl. Ithaca, New York. BLOW, W.H., 1959. Age, Correlation and Biostratigraphy of the Upper Tocuyo (San Lorenzo) and Pozon Formations, Eastern Falcon, Venezuela. Bull. Am. Pal., 39 (178) : 1-251, 5 tet-figs., 19 pl., 3 charts. Ithaca, New York. BLOW, W.H. & BANNER, F.T., 1962. The Mid-Tertiary Upper Eocene to Aquitanian Globigerinacea. In: EAMES et al. : Fundamentals of Mid-Tertiary strati.graphical correlation : 61-151, 9 pl. Cambridge. BOLLI, H.M., 1957. Planktonic Foraminifera from the Oligo Miocene Cipero and Lengua Formations of Trinidad, B.W.I. U.S. Nat. Mus., Bull. 215 : 97-123, 8 pis., 5 figs. Washington. BOLLI, H.W., LOEBLICH, A.R. & TAPPAN, H., 1957. Planktonic foraminiferal Families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. U.S. Nat. Mus., Bull. 215 : 3-50, 9 figs., 11 pls., Washington. ELLIS & MESSINA. Catalogue of Foraminifera. Am. Mus. Nat. History. HOOYBERGHS, H.J.F. & DE MEUTER, F.J.C., 1972. Bi0:. stratigraphy and interregional correlation of the " Miocene " deposits of Northern Belgium based on planktonic foraminifera. The Oligocene Miocene boundary on the southern edge of the North Sea Basin. Meded. Kon. Acad. Wet., Let. & Schone Kunsten van Be]gie. Klasse der Wetenschappen, Jg. XXXIV (3) : 1-47, 5 figs., 1 tab., 11 pis. Brussel. HOWE, H.V. & WALLACE, W.E., 1932. Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catajoula Parish, Louisiana. Geol. Bull., New Orleans, 2 : 18-79, 15 pls. (Fide ELLIS &MESSINA).

NOTE ON THE STRATIGRA~HIC POSITION OF THE ZONDERSCHOT SANDS MEMBER OF THE BERCHEM FORMATION 59 JENKINS, D.G., 1960. Planktonic foraminifera from the Lake Entrance oil shaft, Victoria, Australia. Micropal., 6 (4) : 345-371, 10 figs., 5 pls. New York. LEROY, L.W., 1939. Some small foraminifera, ostracoda and otoliths from the Neogene ('Miocene") of the Rokan-Tapanoeki area~ Central Sumatra. Natuurk. Tijdschr. Nederl. Indie, 99 (6) : 39-40, 2 figs., 3 pis. Batavia, Java. ORBIGNY, A. D', 1826. Tableau methodique de la Classe des Cephalopodes. Ann. Sc. Nat. sfa. 1, 7 : 96-514, 8 pis. Paris. REUSS, A.E., 1850. Neue Foraminiferen aus den Schichten des Oesterreichischen Tertiilbeckens. K. Akad. Wiss. Wien, Math.-Naturw. Cl. Denkschr., 79(2) : 119-128. Brussel. WALTHERS, R., 1965. The Globorotalia zealandica and Globorotalia miozea lineages. New Zealand Jour. Geol. Geophys. Wellington, 8 (1) : 120. (Fide ELLIS & MESSINA).

60 H.J.F. HOOYBERGHS PLATE I 1. Globorotalia obesa BOLLI, 1957 Sample B 237. Br. 1/2. X 70 2. Globorotalia obesa BOLLI, 1957. Sample B 238. Br. 1/17. X 75 3. Globorotalia zealandica incognita WALTHERS, 1965. Sample B 238. Br. 1/25 X 90 4. Globigerina bulloides D'ORBIGNY, 1826. Sample B 238. Br. 1/16 X 70 5. Globigerina angu,stiumbilicata BOLLI, 1957. Sample B 237. Br. 1/8 X 130 6. Globigerina ouachitaensis HOWE & WALLACE, 1932. Sample B 239. Br. 1/6 X 110 7. Globigerina woodi JENKINS, 1960. Sample B 239. Br. 1/22 X 80 8. Globigerina praebulloides praebulloides BLOW, 1959. Sample B 238. Br. 1/26 X 135. 9. Globigerina praebulloides leroyi BLOW & BANNER, 1962. Sample B 238. Br. 1/5 X 120. 10. Globigerinoides altiaperturus BOLL!, 1957. Sample B 238. Br. 1/15 X 80. Ventral side. 11. Globigerinoides altiaperturus BOLL!, 1957. Sample B 239. Br. 1/10 X 95. Dorsal side. 12. Globigerinoides quadrilobatus BANNER & BLOW, 1962. Sample B 237. Br. 1/1 X 65. 13. Globigerinoides trilobus trilobus (REUSS, 1850). Sample B 238. Br. 1/4 X 80. 14. Globigerinoides trilobus immaturus LEROY, 1939. Sample B 238. Br. 1/7 X 135 15. Globigerinita unicava unicava (BOLL!, LOEBLICH & TAPPAN, 1957). Sample B 239. Br. 1/19 X 90.

NOTE ON THE STRATIGRAPHIC POSITION OF THE ZONDERSCHOT SANDS MEMBER OF THE BERCHEM FORMATION 61

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