Fossils & Geologic History

Which of the following most likely results in the formation of a fossil?

• A clam is eaten by a large predatory fish.

• A clam is washed up onto the beach.

• A clam lies exposed on the surface of the sea floor.

• A clam is buried by a mudslide.

From the diagram, which statement about crinoids, echinoids and blastoids is correct?

• They all existed in the Devonian Period.

• All have decreased in number over time.

• They came into existence during the same geologic period.

• All are now extinct.

Identify the geologic time in which humans appeared

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

• Phanerozoic Eon

Identify the geologic time which was the age of the dinosaurs

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

• Phanerozoic Eon

Identify the geologic time which was mostly ocean life

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

• Phanerozoic Eon

Identify the geologic time was first life

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

• Phanerozoic Eon

What was the major event that separated Precambrian Time from the Phanerozoic

• Extinction of dinosaurs and many other species

• Extenction of trilobites and mony other marine animals

• The transition from one-celled organisms to multi-celled organisms

• First birds

• First fish

What marked the end of the Paleozoic and the start of the Mesozoic

• Extinction of dinosaurs and many other species

• Extenction of trilobites and mony other marine animals

• The transition from one-celled organisms to multi-celled organisms

• First birds

• First fish

What marked the end of the Mesozoic and the start of the Cenozoic

• Extinction of dinosaurs and many other species

• Extenction of trilobites and mony other marine animals

• The transition from one-celled organisms to multi-celled organisms

• First birds

• First fish

First Fish

• Ordovician

• Jurassic

• Pennsylvanian

• Quaternary

• Devonian