258 Tracks of Animals in Variegated Sandstone. 
distinctly embedded upon the lower red sandstone, and in the 
Saal valley, between Weissenfels and Diirrenberg, they are cov- 
ered by the upper red clay. We find traces of track-casts also at 
Crossen, at Weissenfels, and at Gross-Aga not far from Zeitz ; 
however, only here and there, and perhaps less distinctly than at 
Pélzig. At the latter place, the animals seem to have congrega- 
in s. But however rare they appear in the other places, 
the wide extent of the region in circumstances favorable to their 
hardening, is worthy of attention. 
The quarries of Pélzig and Klein-Pérthen are situated in paral- 
lel level vallies, and are separated from one another by a mountain 
ridge about an hundred feet high and one mile broad. The at- 
rangement of the individual strata in them is represented on the 
plate, (B,) and needs only a few explanations in addition. 
In both places, the sequence of the strata is tolerably uniform, 
although some variations exist with -respect to thickness and in- 
ternal composition. The track-strata, indicated by arrows, may 
be regarded as parallel, since their position in general corresponds 
so exactly, that they might be held as actually identical. 
The lowest track-layer in both places occurs in a minutely gran- 
ular gray-yellow sandstone, whose strata, from one to two feet 
thick, and séparated by a thin layer of clay, are preferably em 
ployed for the getting out of the larger building-stones, and on 
this account, they are called’ by the workmen, “ Werkbank.”* 
Upon this follows, at Pérthen, a firm, dark gray oolite, passing 
beneath into gray sandstone with traces of copper-gree, but at 
Polzig on the contrary, a firm, gray sandstone, which only rarely 
contains oolite. At both of these places these strata are. called, 
on account of their hardness, “ Eisenstein,” and are used especi- 
ally for road making. Z 
Next, at Porthen, greenish-gray slate clay, called “ Schiefer- 
schutt,” and the same at Pélzig, but alternating above and below 
with sandstone strata. 
On this follows, at both places, the upper track-layer, 0? © 
under surface of the sandstone strata, which, at Porthen, are thio, 
and frequently alternating with slate-clay, on which account they 
Te cg (ee ema 
on the 
* The local terms employed-by the workmen I have not thought it igo 
to translate in the text or plate. I give their literal signification Werkbank, s sa! 
board or work-bench ; eisenstein, ironstone ; schieferschutt, slate earth ; schalste 
_ binke, shale-banks ; rother schutt, red earth ; sandplatten, sandplates.— Tr. 
