U1M1 Fast and Curious: Geologic Time

A principle stating that geologic processes that occur today are similar to those that occurred in the past

• uniformitarianism

• unconformities

• superposition

• correlation

The numerical age, in years, of a rock or object

• relative age

• absolute age

• geologic time scale

• key bed

the age of rocks and geologic features compared with other nearby rocks and features

• relative age

• absolute age

• geologic time scale

• key bed

Tags

NGSS.MS-ESS1-4

the principle that in undisturbed rock layers, the oldest rocks are on the bottom

• geologic time scale

• index fossils

• inclusions

• superposition

principle that most rock-forming materials are deposited in horizontal layers

• uniformitarianism

• lateral continuity

• original horizontality

• correlation

principle that sediments are deposited in large, continuous sheets in all lateral directions

• uniformitarianism

• lateral continuity

• original horizontality

• correlation

a piece of an older rock that becomes a part of a new rock

• fossil

• disturbances

• inclusions

• cross-cutting

the principle that if one geologic feature cuts across another feature, the feature that it cuts across is older

• correlation

• cross-cutting relationships

• inclusions

• lateral continuity

the preserved remains or evidence of past living organisms

• uniform

• key bed

• fossil

• index fossil

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

the extinction of many species on Earth within a short period of time

• mass extinctions

• index fossil

• superposition

• uniformitarianism

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-1