High Quality Content by WIKIPEDIA articles! Abraham Gottlob Werner (September 25, 1749 – June 30, 1817), was a German geologist who set out an early theory about the stratification of the Earth`s crust and coined the word Neptunism. Though much of Werner`s theoretical work was erroneous, science is indebted to him for clearly demonstrating the chronological succession of rocks, for the zeal which he infused into his pupils, and for the impulse which he thereby gave to the study of geology. He has been called the “father of German geology.”