Exam 24: Geologic Time

The Pleistocene is a(n)

The oldest era in the Phanerozoic eon is the ______________ era.

The Eocene is a geologic_______________.

A dike that intrudes a bed of sedimentary rock is ______________ than the sedimentary rock.

Lack of knowledge of the phenomenon called ______________ led Lord Kelvin to an incorrect estimate of the age of Earth.

Paleontology is the study of

The Triassic period is part of which era?

The Holocene is a(n)

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

Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after two half-lives have elapsed?

Reasonable values for the absolute ages of sedimentary rocks are frequently determined by relating them to ______________ rocks whose absolute ages have been determined.

The smallest units of geologic time are the

The Mesozoic is a(n)

The process of matching up rock layers in different localities by the use of index fossils or other means is called ______________.

We live in the ______________ epoch.

Geologists have principally used which class of rocks for radiometric dating?

Geology's best tool for establishing absolute (numerical) geologic time is called ______________ dating.

The Paleocene is a(n)

A(n) ______________ is any indication of prehistoric life preserved in rock.

The term age of mammals is sometimes used to refer to the ______________ era.