Quiz Nine (9:30-9:35 AM)
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1 Quiz Nine (9:30-9:35 AM)
2 UNIVERSITY OF SOUTH ALAAMA GY 112: Earth History Lecture 25: Paleozoic 2: More Laurentia! Instructor: Dr. Douglas W. Haywick
3 Last Time The Paleozoic of North America 1) Laurentian passive continental margin sedimentation 2) Central North America 3) The Grand Canyon (geology) (web notes 24)
4 Consider: Equator: 1) passive continental margin 2) shallow marine water (shelf) 3) tropical climate All the way from Labrador to Alabama 1+2+3= Fossil. Limestone, oolite, quartz arenite etc.
5 The Humber zone is a region of undeformed, passive continental margin rocks
6 Classic Paleozoic reef rocks (stromatolites, rugose and tabulate corals), quartz arenite sandstone, shallow marine dolostone, even some evaporites
7 A sudden (localized) deepening occurred (transgression) and above that.
8 Thrust faulting A Thrust Faulting A
9 Cratonic Sequences Ignoring tectonics for a moment and you ll see that sea water covers much of the craton in these 2 paleogeographic images, but not always to the same extent Middle Ordovician Early Devonian
10 Cratonic Sequences When continents flood during transgressions, sediment is deposited. When regressions occur, erosion takes place producing unconformities (disconformities) Thick sedimentary packages between disconformities are called cratonic (depositional) sequences.
11 Cratonic Sequences When continents flood during transgressions, sediment is deposited. When regressions occur, erosion takes place producing unconformities (disconformities) Thick sedimentary packages between disconformities are called cratonic (depositional sequences). asins have thick sequences (shorter disconformities) Arches/domes have thin sequences (longer disconformities)
12 Cratonic Sequences
13 Today s Agenda The Paleozoic Part 2 1) ack to Newfoundland 2) Eastern Laurentian Orogenies (Appalachians) 3) Other Laurentian Orogenies (Antler, Ouachita) (web notes 25)
14 The Humber zone is a region of undeformed, passive continental margin rocks
15 Thrust faulting
16 A Even though this coastline of Laurentia was a passive continental margin, a plate tectonic boundary was rapidly approaching A
17 Laurentia A Island arc altica A The resulting Taconic Orogeny first depressed the seafloor (localized transgression) and then pushed previously deposited passive continental margin sediments up into thrust fault mountains. There was only minimal metamorphism and igneous intrusions. Middle Ordovician
18 Laurentia altica Middle Ordovician
19 Laurentia altica Middle Ordovician
20 Laurentia A The next tectonic event (the Acadian Orogeny) was caused by the approach of altica altica A altica altica Late Ordovician
21 A The Acadian Orogeny was more extensive and more intense (metamorphism and lots of igneous intrusions) A Early Devonian
22 The Acadian Orogeny was more extensive and more intense (metamorphism and lots of igneous intrusions) Early Devonian
23 Lastly, along comes Gondwanna and. A well you get the idea. A Mississippian
24 Lastly, along comes Gondwanna and. A well you get the idea. A Pennsylvannian Suture zone
25 Lastly, along comes Gondwanna and. well you get the idea. Pennsylvanian
26 Other Laurentian Orogenies Period Permian Pensylvannian Mississippian Devonian Silurian North America Alleghenian Orogeny* (SE) Ouachita Orogeny (S) Acadian Orogeny* (E) Antler Orogeny (W) Ordovician Cambrian Taconic Orogeny* (NE)
27 Other Laurentian Orogenies Period Permian Pensylvannian Mississippian Devonian Silurian North America Alleghenian Orogeny* (SE) Ouachita Orogeny (S) Acadian Orogeny* (E) Antler Orogeny (W) Ordovician Cambrian Taconic Orogeny* (NE) Antler Orogeny
28 Other Laurentian Orogenies Period Permian Pensylvannian Mississippian Devonian Silurian North America Alleghenian Orogeny* (SE) Ouachita Orogeny (S) Acadian Orogeny* (E) Antler Orogeny (W) Ordovician Cambrian Taconic Orogeny* (NE)
29 Other Laurentian Orogenies Period Permian Pensylvannian Mississippian Devonian Silurian North America Alleghenian Orogeny* (SE) Ouachita Orogeny (S) Acadian Orogeny* (E) Antler Orogeny (W) Ordovician Cambrian Taconic Orogeny* (NE)
30 Other Laurentian Orogenies Period Permian Pensylvannian Mississippian Devonian Silurian North America Alleghenian Orogeny* (SE) Ouachita Orogeny (S) Acadian Orogeny* (E) Antler Orogeny (W) Ordovician Cambrian Taconic Orogeny* (NE) Ouachita Orogeny
31 Today s Homework 1. Catch up on your sleep! Next Time 1. Paleozoic Geology of Alabama
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UNIVERSITY OF SOUTH ALABAMA. GY 112: Earth History. Lecture 36: Plio-Pleistocene Geology. Instructor: Dr. Douglas W. Haywick
UNIVERSITY OF SOUTH ALABAMA GY 112: Earth History Lecture 36: Plio-Pleistocene Geology Instructor: Dr. Douglas W. Haywick Last Time A) Cenozoic Overview and Tectonics Western North American tectonic provinces
3. Bedrock from which entire geologic time period is missing between rock units 5 and 6? The fault most likely occurred after
Homework # 4 Relative Dating Name: Section: Date: 1. The cross section below represents a portion of Earth s crust. Letters through D are locations within the rock units. 5. The sequence of rock types