Unit5 Key Terms

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Trace Fossil
Preserves the activity of an organism (e.g. tracks and trails)
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Fossil Life Assemblages
A collection of organisms found within sediments in the same positions they would have been when they were alive (e.g. a bivalve in a burrow)
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Fossil Death Assemblages
A collection of organisms found in a different place and position than they occupied in life (e.g. dissarticulated shells)
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Derived Fossils
Fossils found in one rock, weathered out and re-deposited in another rock. The different fossils may provide conflicting dates.
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Diplodocus
A sauropod herbivore common in the Jurassic and Cretaceous
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Tyrannosaurus
A therapod carnivore common in the late Cretaceous
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Iguanodon
An ornithopod herbivore common in the late Jurassic (could be quadrupedal and bipedal)
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Archaeopteryx
First known bird-like fossil, believed to be intermediate between birds and reptiles
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Mass Extinction
When there is a massive decrease in the number of different species, over a relatively short period of time (could be over a few million years)
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Other cards in this set

Card 2

Front

A collection of organisms found within sediments in the same positions they would have been when they were alive (e.g. a bivalve in a burrow)

Back

Fossil Life Assemblages

Card 3

Front

A collection of organisms found in a different place and position than they occupied in life (e.g. dissarticulated shells)

Back

Preview of the back of card 3

Card 4

Front

Fossils found in one rock, weathered out and re-deposited in another rock. The different fossils may provide conflicting dates.

Back

Preview of the back of card 4

Card 5

Front

A sauropod herbivore common in the Jurassic and Cretaceous

Back

Preview of the back of card 5
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