Dinosaurs, small mammals, and birds are found in this time period.

What is the importance of studying fossils?

6. A branch of geology dealing with the arrangement of sedimentary rock layers or strata?

Geologists assume the newest rock layers are on top of the older ones, unless some type of disturbance occurs, in known as …

Determines the “relative” order of past events but not the absolute age.

Uses the decay of radioactive elements to find the ___________________________ of a rock or fossil.

These specialized fossils indicate to geologists the boundaries in geological time and determine the age of rocks.

This chronological time chart is broken into different time chunks, the largest being the Eon, then Era, Period, and Epoch.

Approximately how old is the Earth?

History of life as documented by all fossils, preserved in sedimentary rock strata is known as the _________________________.

Preserved remains of plant and animals from the remote past are called _______________.

The end of life for a group of organisms, usually a species, is called a(n) ________________.