70 
CLARE: OX THE TEIASSIC BOULDER, &c. 
at the faults. Very rarely these were slightly open, the 
interspace being filled with a vein of Calc-spar. This is 
remarkable, as we did not come across Limestone pebbles. 
In the first number of the Midland Naturalist, Mr. J. Ship- 
man speaks of Geodes of Calc-spar, very limited in number 
and distribution, in a Lower Keuper section at Nottingham, 
but considers the case unique. 
The succeeding cutting displayed similar beds, but the 
faults were less frequent, or at any rate less obvious. This 
ended about one and a half miles from Sutton, and afterwards 
beds of soft sandstones and marls predominated, rising, 
slowly, the dip of 3° or 4° being easterly. The surface was 
now cultivated, the heath ending about the same time as the 
gravels ceased to preponderate. Finally, about three miles 
from Walsall, and four from Sutton, just east of the bridge 
by Aldridge, an exposure on the south side displayed marls 
at a much higher angle, the dip being about 30°, composed 
of green and red layers, very fissile. Suddenly they were fol- 
lowed by a bed, about 40 feet thick, composed of pebbles and 
boulders, some quite large, in a clayey matrix (PL IV., Fig. 3). 
This, in its turn, appeared to rest upon sand, but the strata were 
here very much obscured, the cutting having been finished 
and sloped off. Then red and grey shales seemed to alter- 
nate ; but their character and age appeared uncertain, the 
dip being the same as at the bridge. Soon, however, the red 
disappeared, and a specimen of Atrypa reticularis made it 
likely that we had crossed the fault and entered upon the 
Silurian area. Just to the south rose the Great Ban-, a well- 
known landmark of Lower Llandovery. More fossils appeared 
upon the newly-planed slopes, especially enormous numbers 
of Atrypa, many of them most strangely crushed. Thin beds 
of Limestone appear, and it is soon evident that we are on 
the Barr Limestone, a synonym for Wenlock Limestone, in 
the Wenlock shales. A little further on we entered upon a 
splendid section in a cutting about 30 feet deep, yielding 
