Tracks of Animals in Variegated Sandstone. 



257 



The net-formed pads had first led me, as already observed, to 

 search for tracks ; I was, therefore, quite surprised to find them 

 so rarely in connection with the foot-tracks, although occurring 

 very abundantly in the same quarry. The clayey underlayer of 

 the track-strata happens to be so thin here ordinarily, (|-^ an 

 inch,) that it perhaps on this account did not crack in drying. I 

 would remark farther on one striking peculiarity of the track-slabs 

 of this place ; they are generally very undulatory upon the side 

 opposite the impressions, that is, the upper, and more even on the 

 under. The water evidently has had more effect on the sand 

 than on the tough clay. 



New Red Sandstone formation. 



At Klein-Porthen 



Sandplatten. 



Rotlier Schutt. 



Schalstein 

 Biinke. 



Schieferschutt. SS^Bia 

 Eisenstein. 



Obere Werk- 

 bank. 



Untere Werk- 

 bank. 



Irucks 



'- Fe.et 



Approximate scale of the thickness of the strata. 



The track-reliefs occur at Polzig and Klein-Porthen, it is prob- 

 ably only in two layers, whose particular position is indicated on 

 the plate (B) by small arrows. These layers belong in general to 

 the middle region of the variegated sandstone formation. They 

 are characterized throughout the whole district by gray, yellow, 

 and even white colors ; at Crossen, on the Elster, we see them 



Vol. XXXVIII, No. 2.— Jan .-March, 1840. 33 



