Geologic Time Scale

Age of bacteria

• relative age

• Permian extinction

• precambrian era

• Paleozoic era

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

method used to determine the age of rocks by comparing rocks with younger and older rock layers

• extinction

• fossil record

• relative age

• geologic time scale

Tags

NGSS.MS-ESS1-4

Each rock layer is newer than the one below it

• law of superposition

• geologic time scale

• Permian extinction

• Paleozoic era

Tags

NGSS.MS-ESS1-4

a fossil that is used to establish the age of a rock layer because the fossil is distinct, abundant, and widespread and the species that formed that fossil existed for only a short span of geologic time

• index fossil

• fossil record

• fossil

• relative age

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

A particular period in geologic history (for example Paleozoic, Mesozoic, Cenozoic)

• Cenozoic Era

• Period

• Epoch

• Era

Tags

NGSS.MS-ESS1-4

age of mammals that lasted from 65 million years ago to the present; the era of modern life

• Cenozoic Era

• Mesozoic Era

• epoch

• period

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

The Death of every member of a species

• extinction

• Paleozoic era

• relative age

• Permian extinction

Tags

NGSS.MS-LS4-1

the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock

• fossil record

• geologic time scale

• species

• fossil

Tags

NGSS.MS-LS4-1

a particular period in geologic history (for example, Cambrian, Devonian, Jurassic, Tertiary)

• epoch

• era

• period

• Cenozoic era

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Age of reptiles (dinosaurs) Scientists believe that it ended due to a meteorite hitting the Earth, causing a thick layer of dust/dirt cloud (causing an ice age) due to the sun not being able to reach Earth's surface

• Cenozoic Era

• Paleozoic Era

• Precambrian Time

• Mesozoic Era

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1