Fossils & the Age of Rock

What measurement of time is larger than periods?

The region of sedimentary rock between the man's thumb & index finger indicates ___ year(s)?

The exact number of years since a rock was formed is it's

Which letter represents the most recent?

The Age of the Reptiles is:

The gradual development of new organisms from preexisting organisms is called:

Which is the oldest layer in the picture?

The fossil record has shown that life has evolved over time. Older rocks contain fossils of

This was formed during the Paleozoic era:

What marked the end of the Paleozoic Era?

The geologic time scale is a record of

The Precambrian time covers ______% of the Earth's history.

Which of the following describes an intrusion through a layer of sedimentary rock?

What do the fossils in layer A represent?

Radioactive dating enables geologists to determine

The development of warm, shallow seas may have caused:

Amber found in rocks is:

A magma intrusion is always

The quantification of radioactive isotopes is used in:

footprints and evidence of organisms activities are known as

Does the brightness of light has an effect on the # of moths it attracts? Dependent variable?

What is the oldest evidence of the modern human?

The principle that states the oldest rock layer is at the bottom of the geologic column. 

This type of fossil occurs when a hollowed area is filled with minerals

This fossil forms when minerals replace all or part of an organism

Fossils of organisms that were widely distributed but only lived during a short period of time 

An Intrusion is always older than the rocks it cuts through.

Which layer at site 1 might have occurred at the same time as layer W at site 2?

What era did Pangea form?

The trilobite is considered to be the most famous: