298 
HUGHES : INGLEBOROUGH. 
We may be prepared to find any part of the Carboniferous 
rocks let down there, and also to expect slight modifications 
of lithological character from oar knowledge that the conditions 
of sedimentation were contemporaneously changing south of 
the Craven Faults, but if the Taurus Limestone is not the Main 
Limestone it must be part of the Great Scar, in which case we 
should find a difficulty as to the horizon of the sandstones and 
shales below Scaleber Bridge. In these shales there are fish 
remains, and in the Sandstones calcareous nodules and plant 
remains, such as Lepidodendron, Stigmario,, and Calamites. 
Comparison of Top of Main Limestone and Top of Great 
Scar. 
The top of the Great Scar, it is true, greatly resembles the 
top of the Main Limestone. In both, grey limestone passes 
up into a fissile, irregularly-bedded bituminous rock, with finer 
textured black limestones on top. In both, encrinites are abund- 
ant, though at the lower horizon they do not make up the entire 
mass of the rock. In both, nodular flint and chert occur through- 
out. The general facies of the fossils is the same in both — masses 
of Lithostrotion, Syringopora, and single cup corals occur in 
both. But the most marked character is the occurrence in the 
top beds of the irregular bituminous limestone at both the 
Upper and Lower horizon of very large specimens of the normal 
form of Producta gigantea. The upper part of the grey encrinital 
limestone of the Upper Scar becomes darker, more bituminous, 
and shaley in places, and in these uppermost beds large speci- 
mens of the normal type of Producta gigantea occur abundantly. 
They are seen in situ along the south side of the wall that bounds 
the north-east brow of Simon Fell north of Lord's Seat, but 
better specimens can be procured from the adjoining walls. 
So exactly do these fossils resemble the specimens obtained 
from the top beds of the Great Scar below, that one very dis- 
tinguished palaeontologist, who had not seen them in situ, sug- 
gested that they must have been brought up from the lower 
horizon for walling, having no doubt that the species were 
identical. In the earlier stages of growth the shell generally 
