20 terms

Fossils

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fossil
The remains, imprints or traces of prehistoric organisms
Paleontologist
Scientist who study fossils
Natural Selection
A process by which organisms with characteristics that are suited to a certain environment
Mold Fossil
A cavity in the rock when the hard part decayed or dissolved
Cast Fossil
When sediments fill the cavity and produce a copy of a regional object
Petrified/permineralized fossil
fossil in which the spaces inside are filled with minerals from ground water
Preserved fossil/ original remains
When originals of parts of organisms are preserved
Carbonized fossil/ Carbon film
a thin film of carbon residue if left, forming a silhouette of the original
Trace fossil
fossilized tracks and other evidence of activity organisms
Era
Longest subdivisions which are marked by major, striking and ww changes
Period
Units of geologic times characterized by the types
Epoch
Particular time marked by fossils certain features
precambrian
noting to the earliest era of earths history
paleozoic
of or belonging to or designating the era of geologic time that includes camb. (?)
Mesozoic
era of middle life, pangea began to break apart, dinos and reptiles evolved
Cenozoic
era of reent life climate became cooler and ice ages occured
principle/law of superposition
in undisturbed layers of rock, the oldest layers are on the bottom and young on top
relative age/dating
age in comparrison to age of other things
Index fossil
remains of species that existed on earth for relatively short time periods
trilobites
small, hard-shelled organisms that crawled on the seafloor