Geologic Time Fossil Formation Relative Dating Scientific Dating Geologic Blocks 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

This time division spans from the formation of Earth until the beginning of the Paleozoic Era 542 ma.

What is Precambrian Time?

This era began 542 ma and ended 250 ma.

What is the Paleozoic Era?

This period began 65 ma and continues today.

What is the Cenozoic Era? (The age of Mammals)

This era began 250 ma and ended 65 ma.

What is the Mesozoic Era? (the age of dinosaurs)

This is the list of the five divisions of time in order from largest to smallest.

What is: Eon Era Period Epoch Age

This is the fossil formation process that formed this fossil.

What is a carbonized imprint?

This is the fossil formation process that formed this fossil.

What is petrification or permineralization?

Almost all fossils are discovered in this type of rock.

What is sedimentary rock?

This is the fossil formation process that formed this fossil.

What is a mold?

This is the fossil formation process that formed this fossil.

What is a cast?

This is the principal that states that Earth’s history can be explained by current processes

What is uniformitarianism?

This is the age of an object in relation to the ages of other objects.

What is relative age?

Layers of rock above an erosion surface are younger than the erosion surface and rocks below are older than the erosion surface according to this law.

What is the law of unconformities?

This law sates that older layers are found beneath younger layers in undisturbed rock.

What is superposition?

This law states that a fault or inclusion is younger than the layers of rock it cuts across.

What is crosscutting relations?

This ____ is constant, the change from unstable parent to stable daughter isotopes is used to determine absolute age.

What is decay rate?

Index fossils, used to find absolute age of rocks, have these three characteristics.

What are wide distribution, easily recognized features, and lived for a short period?

This is how many parent isotopes remain after 2 half-lives.

What is 25%?

This is how many half lives have passed when there is 75% daughter isotopes.

What is 75%? What is 2 Half-lives?

This isotope is the unstable form.

What is the parent?

This is the order, from youngest to oldest, of the events which created this bedding layer.

What is: A E D B C?

This is the order, from youngest to oldest, of the events which created this bedding layer.

What is: E D A B C?

This is the order, from youngest to oldest, of the events which created this bedding layer

What is: E I D H B F A C G?

This is the order, from youngest to oldest, of the events which created this bedding layer

What is: B A C