Law of Superposition
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
I would say that you would need to see what the environment around the area is. and what kinds of animals would be out of homes.<span />
Cholesterol is a waxy substance found in blood.
Probably if there are not enough plants in that area