Geologic Time Scale Lesson 2

surfaces where rock has eroded away, producing a break, or gap, in the rock record

• unconformities

• correlation

• index fossils

• key bed

Tags

NGSS.MS-ESS1-4

a method used by geologists to fill in the missing gaps in an area's rock record by matching rocks and fossils from separate locations.

• correlation

• index fossils

• key bed

• geologic time scale

Tags

NGSS.MS-ESS2-3

a fossil representative of a species that existed on Earth for a short length of time, was abundant, and inhabited many locations

• index fossils

• key bed

• geologic time scale

• fossils

a rock or sediment layer with distinctive characteristics makes it easily identifiable in correlation.

• key bed

• geologic time scale

• inclusions

• superposition

Tags

NGSS.MS-ESS1-4

a chart that divides Earth's history into different time units based on changes in the rocks and fossils

• geologic time scale

• relative age

• absolute age

• uniformitarianism

Tags

NGSS.MS-ESS1-4

the principle stating that in a sequence of undisturbed sedimentary rocks, the oldest layers are at the bottom

• superposition

• uniformitarianism

• correlation

• key bed

Tags

NGSS.MS-ESS1-4

a method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock

• relative dating

• absolute dating

• index fossils

• unconformities

Tags

NGSS.MS-ESS1-4

the concept that the processes that have shaped Earth in the past are essentially the same as those operating today

• uniformitarianism

• superposition

• correlation

• key bed

Tags

NGSS.MS-ESS2-1

the process of determining the exact age of a rock or fossil through radiometric techniques

• absolute dating

• relative dating

• superposition

• correlation

the principle that states that layers of sediment are originally deposited horizontally under the action of gravity

• original horizontality

• superposition

• uniformitarianism

• correlation