232 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL.83 



bank), the second at Ehringsdorf (left bank), and the third at Tau- 

 bach (right bank). They are evidently intercalates formed during the 

 latter half of the diluvial times in so many depressions. 



The Ehringsdorf unit is about 1,260 m. (over | mile) long by. 

 at maximum. 400 m. (437 yards) broad, and from approximately 

 40 to over 60 feet thick. It reposes on meadow marl (i^ to over 3 

 ft. thick), beneath which is found a bed of river gravel (3 to 10 ft.) ; 

 and its surface was covered by a substantial layer of humus. 



The rock shows in general a considerable horizontal stratification ; 

 this, in Kaempfer's quarry, showed according to Pfeiflfer (1917) the 

 following : 



' I m. (39.37 in.). 



The origin of travertin units at and near Weimar has been ascribed 

 since the time of Voigt (1781) to precipitation of lime from waters 



