12 
REPORT OF 
casts of fossil fishes, in the collection of that Institution, found in 
the coal measures, near Bradford, and unlike any which have yet 
been discovered elsewhere. One of the Vice-Presidents of our 
own Society 1 has presented some minute specimens of delicate 
and unbroken fresh-water shells, (including cypris, cyclas, &c.) 
found by him in a white and light deposit which lies on the 
diluvial cliffs of Bridlington, locally known by the name of 
rotten-stone, and employed in cleansing the floors. The 
remnant of one of the collections of fossil bones from the cave 
of Kirkdale, which formed part of the first nucleus of the 
Museum, lias been contributed by Mrs. Thorpe, in addition to 
other donations of minerals and books ; and Mr. Smith 
has given to the Society a map of the hills of Hackness, ac¬ 
companied by a memoir in which the stratification of that 
district is minutely described. 
But the fact of greatest interest to Yorkshire geology, 
which the donations of the past year have illustrated, is 
one connected with some fossils from the vicinity of Halifax, 
presented by Mr. Christopher Bawson. It has been long 
known to the geologists of this county that there exists in 
the lower part of the coal series of Yorkshire, in connection 
with a particular bed of coal, one layer of shale which encloses 
the remains of shells belonging to the marine genera pecten and 
ammonites, strongly analogous to, if not identical, with fossils 
of the mountain limestone series beneath. This shelly layer 
has been observed, with the same characters, at several points 
in the vicinity of Leeds, Bradford, Halifax, and Sheffield. In 
the vicinity of Halifax, it contains argillo-calcareous connections 
of a spheroidal figure, in the interior of which Mr. Rawson 
has discovered the same ammonites {a. Listen ) in every stage 
from the youngest to the full-grown shell, with the same pecten, 
(p- papyraceus ,) and in addition, several specimens of ortho- 
1 The Rev. Wm. Vernon Harcourt. 
