Quiz Eight (9:30-9:35 AM)
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1 Quiz Eight (9:30-9:35 AM)
2 UNIVERSITY OF SOUTH ALABAMA GY 112: Earth History Lecture 24: Paleozoic 1: Laurentia Instructor: Dr. Douglas W. Haywick
3 Last Time The Cambrian Explosion A) Why a Cambrian explosion B) Introducing our ancestors (recap. kind of) (web notes 23)
4 The Cambrian Explosion Not so much an explosion more of a shift to hard body parts
5 The Cambrian Explosion
6 The Cambrian Explosion Burgess Shale Fauna Chengjiang Fauna What we know about the early development of all of the current phyla is limited to sites where we have lots of beasties preserved
7 The Burgess Shale s.jpg
8 Today s Agenda The Paleozoic of North America 1) Laurentian passive continental margin sedimentation 2) Central North America (web notes 24) The next few lectures includes several detailed diagrams that may require a bit more discussion than usual. If you don t understand a diagram, ASK QUESTIONS!
9
10 In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated.
11 In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated. Convergent boundary well to the north.
12 In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated. Convergent boundary well to the north. Divergent plate boundary well to the south
13 Consider:
14 Consider: 1) passive continental margin
15 Consider: 1) passive continental margin 2) shallow marine water (shelf)
16 Consider: Equator: 1) passive continental margin 2) shallow marine water (shelf) 3) tropical climate
17 Consider: Equator: 1) passive continental margin 2) shallow marine water (shelf) 3) tropical climate All the way from Labrador to Alabama
18 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.
19 Passive continental margins are sites where thick sequences of coastal and shallow marine sedimentary rocks are deposited Bahamas oolite shoals
20 Passive continental margins are sites where thick sequences of coastal and shallow marine sedimentary rocks are deposited And these rocks were deposited all the way from Labrador to Alabama Cahaba River near Montevallo, AL
21 Passive continental margins are sites where thick sequences of coastal and shallow marine sedimentary rocks are deposited And these rocks were deposited all the way from Labrador to Alabama Cahaba River near Montevallo, AL We could choose any site between them to discuss.
22 Passive continental margins are sites where thick sequences of coastal and shallow marine sedimentary rocks are deposited And these rocks were deposited all the way from Labrador to Alabama Northwestern Newfoundland We could choose any site between them to discuss. I choose Newfoundland
23 Newfoundland is at the northern end of the Appalachian Mountains and is an important geological location
24 The island is divisible into several geological zones
25 The Humber zone is a region of undeformed, passive continental margin rocks
26 This is a section of the Paleozoic stratigraphy of the Humber Zone in Newfoundland
27 Cambrian rocks contain shallow marine limestones, dolostones and quartz arenite sandstones Dolostone
28 Early Ordovician rocks contain dolostones and limestones, some with good reefs (stromatolites, rugose and tabulate corals). Stromatolite reef
29 All are mostly flat lying (nondeformed); they escaped the Paleozoic orogenies Stromatolite reef
30 But something happens as you go up sequence. Shallow marine rocks are overlain by deep marine shale
31 A sudden (localized) deepening occurred (transgression) and above that.
32 Thrust faulting
33 ?
34 A Even though this coastline of Laurentia was a passive continental margin, a plate tectonic boundary was rapidly approaching A B B
35 Laurentia A B Island arc Baltica 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. More on the Appalachians next time B Middle Ordovician
36 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
37 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
38 Cratonic Sequences When continents flood during transgressions, sediment is deposited. When regressions occur, erosion takes place producing unconformities (disconformities)
39 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.
40 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). Basins have thick sequences (shorter disconformities) Arches/domes have thin sequences (longer disconformities)
41 Cratonic Sequences And every depositional sequence is named (e.g., Sauk, Tippecanoe, Kaskaskia etc.)
42 Cratonic Sequences And every depositional sequence is named (e.g., Sauk, Tippecanoe, Kaskaskia etc.) Why the variation in thickness from the center of the craton to the edge?
43 Cratonic Sequences
44 Today s Homework 1. Time Chart 2 (due a week Today) Next Time 1. Paleozoic Geology 2
45 GY 112: Earth History Lecture 24: Laurentia Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposes. For personal use only.
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