144 
Millstone Grit and Coal-Measures being mixed together and all 
conformability destroyed. The beds have been displaced to the 
extent of 800 or 900 feet vertically, one side being upheaved 
the other depressed, while lateral pressure has completed the 
distortion. This fault may be easily traced on the opposite 
side of the river, past Stoneleigh Camp and Nightingale Valley. 
It is here that nearly all the best specimens of Corals have 
been obtained, especially several species of Lithostrotion and 
of the astreiform kinds of Cyathophyllide. The party now 
recommenced the massive mountain series, interrupted by the 
“Great Fault,” and visited the “great” quarry in which good 
cubes of green and purple Fluor-spar are to be found. At the 
western end of this quarry are abundant examples of Trilobites 
and of “‘Productus longispinosus.”” Immediately after this, the 
“Black Rock” quarry was reached. It is from this quarry 
that most of the richest collections in Europe have obtained 
their Icthyodorulites and other remains of placoid fishes, 
mollusea, corals and polyzoa. This, the lowest series of the 
massive “Mountain Limestone,” is terminated by a red bed of 
“encrinital” limestone. The Lower Limestone Shales are now 
reached which are excessively argillaceous and at “‘Cook’s Folly” 
are richly clothed with woods. The lower shales are about 500 
feet thick, every bed of which is very fossiliferous. Immediately 
above this deposit is a thin palate-bed from which have 
been obtained numerous examples of “ Helodus’’, “Conularia,” 
“ Tingula,” “ Bellerophon,” and other fossils. This is the locality 
referred to in the Report of the British Association of 1864, 
pp. 71 as containing undoubted Carboniferous Fossils which 
were formerly classed as Devonian, and found at Marwood, 
Pilton, &. About 90 feet below this, two beds of Quartzose 
Conglomerate were pointed out as the remains of two old 
Devonian rivers. Beyond this occurs no Limestone, every 
bed being entirely made up of a Micaceous Sandstone for a 
distance of nearly 800 feet, when the beds are seen to dip 
below horizontal beds of ‘‘Dolomitic Conglomerate” containing 
numerous geodes of Cale Spar, Chalcedony, and crystallised 
Quartz. 
