The youngest sedimentary rocks are at the top of a cross-section, with the oldest at the bottom

Sedimentary rock layers are in jumbles and in no particular order

The youngest sedimentary rocks are at the bottom of a cross-section, with the oldest on the top

Igneous rocks are in layers organized by color

States that rock layers are younger than the intrusions that pass through them

States that intrusions are the same age as the layers they pass through

States that rock layers and intrusions have random age and do not contain geologic information

States that rock layers are older than the intrusions that pass through them

Places where rock layers change color

Places where rock layers are missing

Places where rock layers change their chemical makeup

Places where the angle of rock layers changes

sediments are always deposited horizontally

strata that is no longer horizontal, must have been moved

sediments are deposited in vertical formations by wind

the deformation is younger than the layers

1,5,3,6,4,2

1,2,3,4,5,6

4,5,2,6,1,3

2,5,4,3,6,1

Absolute age is the actual age of the object, not an estimation based on the things around it, like relative age.

Relative age only deals with fossils

Absolute age only deals with rocks

Relative age is the actual age of the object performed by chemical tests.

Atoms of different elements with the same atomic mass

Atoms of metallic elements

Atoms of the same element with different atomic mass

Atoms of inert gasses

The time it takes for 1/4 of the isotope (parent material) to break down (decay) into its stable daughter material

Time it takes for ½ of the isotope (parent material) to break down (decay) into its stable daughter material

The time it takes for all of the isotope (parent material) to break down (decay) into its stable daughter material

The time it takes for 1/10 of the isotope (parent material) to break down (decay) into its stable daughter material

The remains of a once living thing that must be over 10,000 years old.

Rocks that are shaped like animals

Plant remains that have been molded by rock intrusions

Bones and teeth of ancient mammals

A fossil formed when the hard part of an organism decayed and the soft part dissolves by chemical means, leaving an empty space in the surrounding wood.

A fossil formed when rocks dissolve, leaving empty spaces in mud.

A fossil formed when the soft part of an organism decayed and the hard part dissolves by chemical means, leaving an empty space in the surrounding rock.

A fossil formed when mud and sediment enter the cavity created by footprints.

Occurs when footprints are left in sediment, eventually becoming rock.

Occurs when hard parts of an organism remain nondecayed

Occurs when dying organisms fall into sediment and get preserved.

Occur when minerals fill the empty space of the mold to produce a copy of the original organism

Fossil organisms may be found in no particular order

Fossil organisms succeed (come after) one another in a definite order

Fossil organisms only succeed one another when sediment is involved in their formation

Only casts and molds can be used when dating fossils.

Fossils that relate to the other organisms that lived in their era

Fossils that remain intact most of the time

Fossil that lived in a particular geologic age that are used to identify or date the rock or rock layer in which it is found

Fossils that lived in a particular era that do not correlate to the rock layers in which they are found

Lived for a long time range across several geologic eras

Distinctive or easily recognizable

Abundant

Wide geographic distribution

Precambrian

Jurassic

Triassic

Phanerozoic

Trilobites

Ammonites

Reptiles

Mammals

Paleozoic

Ordovician

Cambrian

Permian

Mesozoic

Cenozoic

Paleozoic

Precambrian

Jurassic

Triassic

Cretaceous

Ordovician