Eras of Geologic Time Scale

The largest division of the geologic time scale is the

• eon
• era
• epoch
• period

The Mesozoic Era was the Age of Reptiles, and the current Cenozoic Era is the Age of

• Birds
• Ice
• Mammals
• Humans

The _________ was an era dominated by the dinosaurs

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

The boundaries between _______ seem to coincide with major changes in the life forms present on Earth.

• Precambrian
• Systems
• Eras 
• Epochs

Fossils are most common in which rock types?

• sedimentary
• igneous
• metamorphic
• all of these commonly contain fossils

Which of the following is used by geologists to determine the relative ages in a rock sequence?

• stratigraphy
• fossils
• cross-cutting relationships
• all of these

What is the definition of Geologic Time Scale ?

• A record of the geologic events and life forms in Earth’s history
• Fossils of widely distributed organisms that lived during only one short period.
• A fossil that is a copy of an organism’s shape, formed when minerals seep into a mold
• Fossils of widely distributed organisms that lived during only one short period.

Known as the age of the mammals?

• Mesozoic Era
• Holocene Epoch
• Cenozoic Era
• Cambrian

The disappearance of a species.

• Evolution
• Extinction
• Migration
• Mutation

Known as the age of the mammals?

• Mesozoic Era
• Holocene Epoch
• Cenozoic Era
• Cambrian