OF PLANORBIS AT STEINHEIM. 



33 



II. Geology op Steinheim. 



GEOLOGICAL MAP. 



The village of Steinheim in the kingdom of Wurtemburg, stands at the height of about 

 1867 Wg. feet above the level of the sea.^ It is not far from Heidenheim on the eastern 

 slope of the elevated plateau forming the Wurtemburger Alb. This village, from which 

 the formations described in the following pages acquire their name, and the village of 

 Sontheim, are situated in a valley which is circular in form, surrounding a central hill ; 

 Steinheim lying just to the north of this elevation, and Sontheim a short distance to the 

 south. The valley externally, is surrounded by a circle of ridges more or less discon- 

 tinuous where they have been cut through by the drainage of the surrounding highlands. 

 The underlying formations of these ridges is the White or Upper Jura. Those of the 

 central hill, where the overlying Tertiary lunestones and sands have been removed 

 by denudation, comprise representations of all the principal formations from the Lias to the 



1 Equal to about 1822.5 English feet, or about 555.5 metres. 



