336 
HUGHES : INGLEBOROUGH. 
older beds of the series are brouglit up in the anticlinal arch, 
as seen between the two barns near Dam House Bridge (Fig. 12) 
and in Wharfe Mill Dam (Fig. 13). These older beds consist 
of mudstones which break into larger prism-shaped fragments 
and slabs than the overlying calcareous shales. There are also 
beds of fragmental felspathic and other rocks such as are usually 
called volcanic ash, but whether they are lapilli showered down into 
the sea directly from eruptions or only the waste of distant still un- 
consolidated beds of volcanic ash distributed over the sea bottom it is 
impossible now to tell. 
Fig. 13. 
a. Striped sandy shale not much cleaved. 
h. Conglomerate not well seen in the line of this section. 
c. Cleaved shale with subordinate calcareous band. 
d. Felspathic ash-like beds and yellow porcellanous rock with subordinate 
black bands, one very conspicuous. These are probably the beds 
seen under the bridge. 
e. Slate strongly cleaved 70° S.S.W. 
/. Felspathic, speckly, ash-like beds exposed at the gate for a horizontal 
distance of about 8 feet. 
g. Very tough, granular, crystalline rock, with small sago-like grains 
of transparent quartz, about 10 inches seen. 
h. Limestone, with a knobbly, irregular surface, about 2 feet seen. 
The strike of e, /, g, h is clear, but not the dip; indeed, it may be that 
between, this and the barn we have crossed the axis of the fold, and that we 
are already on the southern limb of the anticlinal. 
Fossils occur both in the mudstones and in the ash, and especially 
in the intermediate rock in which there is a mixture of the ash and 
mud. The fossils found here are Calymene blumenbachii Brongn., 
Illcenus davisii Salt, Trinudeus seticornis His., Leptoena trans- 
versalis Wahl., Strophomena. The large Strophomenas are so con- 
spicuously the most abundant form that, although they are not 
