Earth Science Chapter 8

Who first formulated the principle of uniformitarianism?

An unconformity is a buried ________.

"This rock is fifteen million years old," is an example of...

"John is older than Susan" is an example of a relative date. T? F?

A worm would stand a poor chance of being fossilized because ________.

Since the Moenkopi Formation was deposited at the end of the Permian period and the very beginning of the Triassic, and the Navajo Sandstone was deposited at the end of the Triassic and into the Jurassic, what is the age of the Chinle Formation?

Which of the following is an essential characteristic of an index fossil?

Sedimentary layers can be important indicators of past environmental conditions that existed when the sediments were deposited. T? F?

A datable mineral crystal contains 40% parent isotope. How many half-lives have passed since the crystal formed?

Why isn't the Precambrian more finely divided into sub-divisions like periods and epochs?

Which describes radioactive decay by beta particle emission?

Alpha emission, beta emission, and electron capture are three different kinds of radioactive decay. T? F?

The earliest 88 percent of geologic time is represented by the time span informally called the ________.

The Phanerozoic, Proterozoic, and Archean are all eons. T? F?

The four basic units that make up the geologic time scale are the eon, the aria, the episode, and the period. T? F?

The geologic time scale was devised before the techniques for numerical dating using radioactivity were developed. T or F