Original: The fine-grained texture of the mud silt forming the limestone from the Solnhofen area ( which is composed mainly of the towns of Solnhofen and Eichstätt ) is ideal for making lithographic plates , and extensive quarrying in the 19th century revealed many fossil finds , as commemorated in the name Archaeopteryx lithographica , all the specimens of which come from these deposits .
Simplified: Extensive quarrying in the 19th century revealed many fossil finds , as commemorated in the name Archaeopteryx lithographica , all the specimens of which come from these deposits .