remains/imprints of prehistoric life
study of fossils, ancient life forms,
parts of the organism most likely to become a fossil (bones, teeth, shells)
only rocks to contain fossils
dinosaur stomach stones
imprint in rock or sediment
results when sediment fills in mold
earliest known fossils
used to estimate age of rocks
common index fossil
insects, spiders, scorpions, etc.
extinct marine arthropods (sea scorpions)
can be preserved by ice, amber, or tar.
imprints, trails, or burrows
imprint of plant/ insect on shale
forms when silicarich wood turns into rock
"oldest rock layer is on bottom"
exact age of rock layer in years
seperates geologic eras
the age of marine invertebres (all life in the ocean)
sudden appearence of diverse life
the Age of corals (first plants and animals on land)
the Age of fishes (first amphibians)
the Age of coal (first reptiles)
the Age of amphibians and reptiles )largest mass extinsion in earths history)
first dinosaurs (pangea starts to break up)
the Age of dinosaurs (first mammals, first birds)
named after chalk (first flowering plants)
the age of mammals
the Age of humans (mega mammals die)
mega mammals die off at the end of the pleistocene epoch
Dinosaur Foot Shape
first or original classification
Dinosaur Hip Shape
5 toed meat eaters
large plant eaters, large necks, large tail
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