geo time

Front

Current time era

Back

Cenozoic Era

Front

Dinosaurs, small mammals, and birds existed during this period.

Back

Mesozoic

Front

Preserved remains of ancient plants and animals.

Back

Fossils

Front

Law of Superposition:

Back

Younger rock layers are above older ones.

Front

Longest time frame 88% of geologic time:

Back

Precambrian

Front

Youngest rock layer?

Back

Mudstone

Front

Organizes geologic time from longest to shortest:

Back

eons, eras, periods, epochs

Front

Rock layer with a fossil older than the fish fossil?

Back

D

Front

Characteristics of Index fossils:

Back

Recognizable, short lifespans, wide distribution.

Front

Scientists studying fossils are called:

Back

Paleontologists