Geologic Time Scale

The layers in sedimentary rock are also called

• strata
• fossils
• eras
• epochs

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

Which of the following represents the longest time period

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

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

Radiometric age is often referred to as __________ age.

• total
• absolute
• historic
• geological

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

Which fossil is an impression left by the original organism?

• cast
• mold
• trace
• preserved remains