GEOL 102 Lecture Notes - Lecture 16: Cambrian Explosion, Mesozoic, Phanerozoic

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31 Mar 2017
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Geology 102 Lecture 16 notes
The Cambrian
Phanerozoic Eon
Contains 3 eras
Paleozoic: 542-251 mya
Mesozoic: 251 mya- 65.5 mya
Cenozoic: 65.5 mya- present
Paleozoic Era
542-251 mya
Contains 6 (or 7) periods
Cambrian 542-488
Ordovician 488-444
Silurian 444-416
Devonian 416-359
Carboniferous 359-299
Permian 299-251
Mesozoic Era
Contains 3 periods
Triassic 251-200
Jurassic 200- 145
Cretaceous 145-65.5
Cenozoic Era
65.5 mya-present
Contains 3 (or 4)
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Paleogene 65.5-23
Neogene 23-1.8
Quaternary 1.8- present
Cambrian Period
542-485 mya
Plate Tectonics
Laurentia, Siberia, and Baltica split away from Gondwana
Gondwana- Africa, South America, Antarctica, Australia, Eurasia, India
Paleoclimate
Melting of the great glaciers from the Proterozoic meant that sea levels had risen
(transgression)
Cambrian characterized by flooding of continents- shallow seas
The Cambrian Explosion
A massive evolutionary radiation occurred at the beginning of the Cambrian
While the roots of many modern groups stretch into the Proterozoic, they
diversified ad thrived in the Cambrian
Chengjiang Fauna
525- 520 bya
Yunnan Province, China
Lagerstatten preserving some of the earliest Metazoans known from the
Cambrian
Discovered in the 1990s
Groups Present in Chengjiang
Arthropda
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Document Summary

Laurentia, siberia, and baltica split away from gondwana. Gondwana- africa, south america, antarctica, australia, eurasia, india. Melting of the great glaciers from the proterozoic meant that sea levels had risen (transgression) Cambrian characterized by flooding of continents- shallow seas. A massive evolutionary radiation occurred at the beginning of the cambrian. While the roots of many modern groups stretch into the proterozoic, they diversified ad thrived in the cambrian. Lagerstatten preserving some of the earliest metazoans known from the. Two valves (shells), lophophore(cilia for filter feeding), bilateral symmetry through hinge. Specialized stinging cells, radial symmetry, a single orifice. Undifferentiated cells (lack organs, different tissues) sessile, choanocytes. Notochord, dorsal hollow nerve chord, pharyngeal slits, tail. We don"t know where these things belong in the tree of life. Most groups found in chengjiang are present here as well- more diverse. Index assemblage for burgess shale type fauna . >10 lagerstatten, ranging from 525 mya (chengjiang) to 500 mya (kinekulle,

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