Geologic Time
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sediment
Solid particles such as weathered rock fragments, materials from organisms, or minerals that settle out of a solution that are deposited at or near Earth’s surface
fossil
the trace of an organism from the past
geologic timescale
the standard method used to divide Earth’s long natural history into manageable parts
tectonic plates
blocks of lithosphere that consist of the crust and the rigid outermost part of the mantle
strata
a layer or a series of layers of rock in the ground.
faunal succession
the combination of fossils changes vertically from layer to layer and the groupings of fossils as well as the order of combinations are mostly consistent from place to place.
index fossil
a fossil that is useful for dating and correlating the strata in which it is found.
Cambrian explosion
the time about 540 million years ago when revolutionary changes in life forms in Earth’s history started