Exam 24: Geologic Time

The Holocene is a(n)

Eons are divided first into

Sea lilies are more scientifically called ______________.

The Miocene is a(n)

Sedimentary layer A lies above sedimentary layer B, and both are cut by an igneous dike, C. Therefore, the order from oldest to youngest is

Fossilized tree resin is called ______________.

Geology's best tool for establishing absolute geologic time is

Eras are divided first into smaller time units called ______________.

Fossilized tree resin is known as

______________ fossils are those typical of a particular limited time segment of Earth's history.

The Triassic period is part of which era?

The Tertiary is a(n)

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

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.

The Triassic 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.

New material filling a mold forms a ______________ of the original shell or bone.

The Paleocene is a(n)

Which of the following were marine invertebrates that looked like plants and left fossil segments sometimes called "Indian money"?