geologic time- barker

preserved remains or traces of living things

• fossil

• index fossil

• intrusion

• extrusion

• extinct

fossils of widely distributed organisms that lived during a geologically short period of time

• fossil

• index fossil

• intrusion

• extrusion

• extinct

when magma pushes into rock below the surface cools and hardens into a mass of igneous rock

• fossil

• index fossil

• intrusion

• extrusion

• extinct

lava that erupted onto the surface to form into igneous rock

• fossil

• index fossil

• intrusion

• extrusion

• extinct

condition of no longer existing or ever being able to live again on earth

• fossil

• index fossil

• intrusion

• extrusion

• extinct

rock's age compared to the ages of other rock layers or event that occurred in that area

• relative age

• absolute age

• principle of superposition

• eras

• periods

rock's actual number age, representing how many years that have passed since that rock formed

• relative age

• absolute age

• principle of superposition

• eras

• periods

undisturbed rock layers, the oldest layer is at the bottom

• relative age

• absolute age

• principle of superposition

• eras

• periods

three long units of time dividing the time between the Precambrian time and the present

• relative age

• absolute age

• principle of superposition

• eras

• periods

units of geologic time that serve as subdivisions of eras

• relative age

• absolute age

• principle of superposition

• eras

• periods