Exam 24: Geologic Time

The Devonian is a(n)

Eras are divided first into

Fossilized tree resin is called ______________.

Starting with a sample of pure parent radionuclide,what would be the ratio of the parent radionuclide to its daughter after one half-life has elapsed?

Lead that comes from radioactive decay is called ______________ lead.

Trilobites lived during which era?

The study of fossils is called ______________.

Which epoch is also called the Ice Ages?

The Shroud of Turin,the Iceman,and the Dead Sea Scrolls were dated by use of

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

The smallest units of geologic time are the

In which of the following eons do we live?

Which of the following is not a feature of a good index fossil?

The K-T impact is thought to have occurred at what site?

The largest units of geologic time are the

The Eocene is a(n)

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 Pleistocene epoch is also referred to as the ______________.

Which of the following radionuclides is used to date once-living material?

A group of periods is called a(n)