Exam 24: Geologic Time

A lava flow radiometrically dated at 300 million years lies just below sedimentary layer A and just above sedimentary layer B. What can be said of the ages of beds A and B?

The Eocene is a geologic______________.

Another name for cyanobacteria, the earliest evidence of ancient life, is

The ______________ states that in a sequence of undisturbed sedimentary rocks, lavas, or ash, each layer is younger than the layer beneath it.

A number of epochs is called a(n)

Tracks, borings, and burrows are examples of

Stromatolites are structures created by

The Great Dying occurred at the end of the ______________ era.