The ideas of continental drift and the supercontinent of Pangaea were presented by A. Wegener in 1915. An example of convergence is the wings of Pterodactyls and bats. Cooksonia fosils have been found in the USA, Canada and Czechoslovakia. The dinosaur Drinker was named by Robert Bakker in 1990 as a tribute to Cope. They are the biggest source of protein in the oceans and are found in all of the oceans and in many bodies of fresh water.
Coprolites record the diet and habitat of prehistoric animals.
Recently, a huge T. rex coprolite was found in Canada. The term coprolite was coined around 1830-1830. The type species is C. casuarius . There is a new and very controversial theory that there are comets composed of frozen water that are constantly bombarding the Earth. These frozen comets vaporize in the atmosphere, adding water vapor to the environment.