Determining the order rocks form is an example of

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

Sedimentary rock layers left undisturbed will remain horizontal

A break in the geologic record

Numeric age of a rock

Sedimentary deposits showing definite annual layers

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

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

Fossilization the happens in very dry places

Stones in dinosaurs digestive tracks

Ordered arrangement of rocks layers by relative age

Our current era

The longest era of geologic time

Peak of dinosaurs