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21 Cards in this Set
- Front
- Back
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Ediacaran fossils |
Soft bodied Pre-Cambrian organisms |
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5 major extinction events |
Ordovician, Devonian, Permian, Triassic, Cretaceous |
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Most devastating extinction event |
Permian: If you were more than a meter in any dimension, you did not survive. |
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The Alvarez Team |
Researched the K-Pg Extinction: Helen Michaels, Luis Alvarez, Walkter Alvarez, Frank Asaro |
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Helen Michaels |
Paleontologist |
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Luis Alvarez |
Geologist |
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Walter Alvarez |
Geologist |
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Frank Asaro |
Nuclear Chemist |
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Iridium |
Found on earth, spiked after the extraterrestrial impact of the K-Pg boundary. |
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Chicxulub crater |
Off the coast of Yucatan, Mexico, 200 km in diameter |
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K-Pg (K-T) Extinction was when? |
65 MYA |
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Shiva Crater |
Discovered in India; don't know when it hit; 40km in diameter; could have broken off from the Yucatan crater |
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Permian extinction event |
Oxygen levels plummet; 94% of marine species disappear; could have been caused by volcanic activity that decreased photosynthesis; takes a long time to recover (at least 1/2 million years) |
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Pangaea |
The one large continent that existed during the Permian period |
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Siberian Traps |
An area in Siberian that had massive volcanoes; could have caused the Permian extinction via acidification of the oceans; created a positive feedback loop |
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Cladogenesis |
The formation of a new group of organisms or higher taxon by evolutionary divergence from an ancestral form (a branch forms) |
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Anagenesis |
Species formation without branching of the evolutionary line of descent. |
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Pseudoextinction |
The apparent extinction of a group of organisms with the survival of modified descendant forms (the original anagenesis organism) |
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Phyletic gradualist models |
The hypothesis that phylogenetic trees experience change that is slow, gradual, and constant. |
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Punctuated equilibrium theory |
Stasis (represented by long, verticle lines on phylogenetic trees) is the status quo. When change occurs, it is rapid and associated with branching speciation. |
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Batrachochytrium dendrobatidis (Bd) |
Nasty fungus that is contributing to the amphibian decline; infects the skin of frogs |
