A Trip Through Geologic Time

A type of fossil that gives evidence of the ACTIVITIES of ancient organisms(what they eat or how they socialize).

Which rock layer is youngest?

A fossil that is a solid copy of an organism's shape, formed when minerals seep into a mold.

A type of fossil that is a hollow area in sediment in the shape of an organism or part.

An igneous rock layer formed when magma pushes up and hardens beneath Earth's surface.

One of the three long units of geologic time between the Precambrian and the present.

The preserved remains or traces of an organism that lived in the past.

The law that says that the older layers or rock are below the younger layers.

A record of the geologic events and life forms in Earth's history - divided into chunks of time.

Originally, the geologic time scale placed Earth’s rocks in order by

A scientist who studies fossils to learn about organisms that lived long ago.

Which period do we currently live in?

An igneous intrusion is ________________ than the rock it cuts through.

A crack in Earth's crust that usually moves rock layers it cracks through.

Change over time; the process by which modern organisms have descended from ancient organisms.

Which type of fossil is shown in the picture?

Which era do we currently live in?

Term used to refer to a group of related organisms that has died out and has no living members.

When did the oceans and atmosphere form?

A smaller unit of geologic time that geologists divide eras into.

Which type of fossil (preserved in amber) is shown in the picture?

Which rock layer is oldest?

Comparing rock layers based on the layers around them to determine age.