Geologic Time and Rock Record

a principle that states current geologic processes are the same as the ones of the past

• Uniformitarianism

• Law of superposition

• evolution

Determining the order rocks form is an example of

• Relative Age

• Absolute Age

• Age

The oldest rock layer is on the bottom if it is undisturbed

• Evolution

• Uniformitarianism

• The Law of Superposition

Sedimentary rock layers left undisturbed will remain horizontal

• Law of Superposition

• Principle of original horizontality

• Uniformitarianism

A break in the geologic record

• unconformity

• conformity

• superposition

Numeric age of a rock

• relative age

• absolute age

• age

Sedimentary deposits showing definite annual layers

• cross beds

• ripple marks

• Varves

Method of determining absolute age by comparing ratios of parent isotopes to daughter isotopes

• Radiometric dating

• double life

• Radioactive material

Time required for half of a sample of radioactive material to break down

• One Life

• Double Life

• Half Life

Fossilization the happens in very dry places

• Amber

• Mummification

• Carbon Films