<span>Faunal succession recognized in the sequence of fossils in stratified sedimentary rocks was a key concept that led to the concept of evolution of life on Earth</span>. T<span>his principle is from Willian Smith, an English geologist. It used to determine the age of the rocks and strata.</span>
Proximity means close to you. For example A few yards. Its proximity to the sun in its passage near that body.
Mountain chains and river systems generally run North-South throughout the continent thus making for formidable barriers to East-West expansion.
