How can we help?

You can also find more resources in our Help Center.

38 terms

Fossils/Ancient Life Vocab

STUDY
PLAY
Fossils
remains/imprints of prehistoric life
Paleontology
study of fossils, ancient life forms,
Hard parts
parts of the organism most likely to become a fossil (bones, teeth, shells)
Sedimentary Rocks
only rocks to contain fossils
Coprolite
fossilized waste
Gastrolith
dinosaur stomach stones
Mold
imprint in rock or sediment
Cast
results when sediment fills in mold
Stromatolites
earliest known fossils
Index fossils
used to estimate age of rocks
Trilobite
common index fossil
Arthropods
insects, spiders, scorpions, etc.
Eurypterids
extinct marine arthropods (sea scorpions)
Original remains
can be preserved by ice, amber, or tar.
Trace fossil
imprints, trails, or burrows
Carbon Films
imprint of plant/ insect on shale
Petrified Wood
forms when silicarich wood turns into rock
Relative age
"oldest rock layer is on bottom"
Absolute Age
exact age of rock layer in years
Mass extinction
seperates geologic eras
Cambrian/Ordvocian
the age of marine invertebres (all life in the ocean)
Cambrian Explosion
sudden appearence of diverse life
Silurian Period
the Age of corals (first plants and animals on land)
Devonian Period
the Age of fishes (first amphibians)
Carboniferous Period
the Age of coal (first reptiles)
Permian Period
the Age of amphibians and reptiles )largest mass extinsion in earths history)
Triassic Period
first dinosaurs (pangea starts to break up)
Jurassic Period
the Age of dinosaurs (first mammals, first birds)
Cretaceous Period
named after chalk (first flowering plants)
Tertiary Period
the age of mammals
Quaternary Period
the Age of humans (mega mammals die)
Pleistocene Epoch
mega mammals die off at the end of the pleistocene epoch
Holocene Epoch
today epoch
Dinosaur Foot Shape
first or original classification
Dinosaur Hip Shape
todays classification
Theropods
5 toed meat eaters
Sauropods
large plant eaters, large necks, large tail
Ceratopsians
horned dinosaurs