Published online by Cambridge University Press: 21 July 2017
One of the basic tenets of geology is the present is the key to the past. In the present context, this simply means that if we document the distribution of organisms today and have some degree of understanding of what combination of environmental variables controls those distributions, then we can use this information to reconstruct past environments by using the fossilized representatives of the modern organisms as paleoenvironmental indicators. This classic use of microfossils, along with biostratigraphy, is of great significance in the search for oil and gas.