Exam 24: Geologic Time

The Holocene epoch began when

Eons are subdivided first into ______________.

Breaks, or gaps, in the rock record at a given locality are called

The earliest evidence of ancient life, blue-green algae, are

We live in the ______________ eon.

The fundamental concept of geology that was developed by James Hutton is

Primordial lead contains the isotope lead-______________, whereas radiogenic lead does not.

The study of fossils is called ______________.

The oldest evidence of life on Earth dates back to about how many years ago?

Carbon dating was used to establish the age of the Shroud of ______________.

The Miocene is a(n)

The largest units of geologic time are called ______________.

Which of the following eons is the oldest?

We live in the epoch called the

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?

Atomic nuclei that decay of their own accord are said to be ______________.

The finding of an abnormally high concentration of the element named ______________ was the first clue to the probable cause of the K-T event.

The Jurassic period is part of the ______________ era.

The Quarternary is a(n)

The Cenozoic era began about how many million years ago?