Exam 24: Geologic Time

Paleontology is the study of

Stromatolites are structures created by

The Eocene is a geologic______________.

Archaeopteryx fossils are those of a prehistoric

The Paleozoic era ended with an event called the

The Cenozoic is a(n)

Which of the following is the era sometimes called the age of reptiles?

A number of epochs is called a(n)

The Triassic period is part of which era?

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

The Cenozoic era consists of only two periods: the ______________ and the Quaternary.

The Quarternary is a(n)

The oldest algal fossils are found on the continent of ______________.

The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n)______________.

We live in the ______________ eon.

The Cambrian is a(n)

The ______________ states that an igneous rock is younger than the rock layers it has disturbed.

The Mesozoic era began about how many million years ago?

The span of time required for the radioactive decay of half the parent nuclei in a sample is known as the ______________.

The Jurassic period is part of the ______________ era.