In most cases mountain ranges take 10's of millions of years to form, and depending on the climate, may last for 100's of millions of years.
Best rock for radiometric dating
Continental lithosphere, because it is less dense, is more bouyant and is not easily subducted, or recycled back into the Earth's interior.
As a result, continents are made-up of very old rocks, some dating back 3.8 billion years.
The similarity or dissimilarity of faunas and floras on different continents can be used to estimate their geographic proximity.
In addition, the evolutionary history of groups of plants and animals on different continents can reveal when these continents were connected or isolated from each other.
The study of paleogeography has two principle goals.
The first goal is to map the past positions of the continents.The past distribution of plants and animals can give important clues concerning the latitudinal position of the continents as well as their relative positions.Cold-water faunas can aften be distinguished from warm-water faunas, and ancient floras both reflect paleo-temperature and paleo-rainfall.Certain kinds of rocks form under specific climatic conditions.For example coals occur where it is wet, bauxite occurs where it is warm and wet, evaporites and calcretes occur where it is warm and dry, and tillites occur where it is wet and cool.Other paleogeographic features change very rapidly and, therefore, any map, at best, is an approximation.