Warm-up - Geologic Time Scale & Law of Superposition - 4/2/2019

The earliest part of Earth's history is called the

• Cenozoic

• Canbrian

• Holocene

• Precambrian

Which division of the geologic time scale is the longest?

• eon

• period

• era

• epoch

Which of these groups of animals appeared on Earth most recently?

• reptiles

• amphibians

• mammals

• fish

Determining the order of events and the relative age of rocks by examining the position of rocks in a sequence is called __________.

• absolute dating

• relative dating

• radiometric dating

• relative carbon dating

Geologic time is divided best into units based on ________.

• geologic changes

• fossils and rocks

• types of life-forms living during certain periods

• types of trilobites

Trilobites can be used to study the passage of geologic time because __________.

• they burrow into sediments

• they lived in the oceans

• they lived throughout the Paleozoic Era

• their physical features changed through time

Trilobite that lived for a short period of time and was abundant is an example of a(n) _________.

• index fossil

• trace fossil

• permineralized remain

• original remain

Which of the following list the divisions of the geologic time scale from the longest to shortest?

• epoch, eon, era, period

• period, epoch, eon, era

• eon, era, period, epoch

• era, eon, period, epoch

The principle of ________ states that in an undisturbed layer of rocks, the oldest rocks are at the bottom and they get progressively younger as the layers move upwards.

• unconformity

• fault

• superposition

• relative age

The diagram below shows layers of sedimentary rock. Assuming that this rock formation is undisturbed. What is the relative age of layer C?

• It is the youngest rock layer.

• It is the oldest rock layer.

• It is older than B and younger than D.

• It is younger than B and older than D.