Exam 23: Geologic Time - Reading the Rock Record

Paleozoic sedimentary rocks derived from marine deposits are widely distributed in all of the continents.What does this indicate about the height of the continents relative to sea level during the Paleozoic?

The theory that different forms of animals throughout Earth's past occurred in a definite order is called the principle of

In a sequence of sedimentary rocks,the bottom layer is the youngest and the top layer is the oldest.This type of sequence suggests that the

Which relative dating principle states that in an undeformed sequence of sedimentary rocks,each layer is older than the one above and younger than the one below?

The rather simple idea that,unless disturbed,younger sedimentary layers overlie older layers,is referred to as the principle of

Sea level fluctuated several times during the Paleozoic.Which of the following is not a representative factor for sea level rise in the Paleozoic?

An unconformity is

An assumption that Earth processes occurring today have always occurred is called

The most important highlight of Precambrian Time was the

The break-up of Pangaea had worldwide consequences with the exception of

The principle of superposition states that the top layer of rock is

The most important event during the Cambrian period was the

The oldest known fossils of single-celled organisms are

The "Cambrian explosion" refers to the

The principle of faunal succession states that

Dinosaurs were abundant during the

The San Andreas Fault was created

To date the age of Earth,we look for rocks with a high percentage of

The Andes and the Sierra Nevada Mountains began to form during the Mesozoic due to

Similar reptiles were present on all continents during the Mesozoic era,but mammals of the Cenozoic era are often different on the different continents.Explain.