26 
right-hand side of the main road, is a very favourite 
quarry of mine, some beds of which are very pro¬ 
ductive, especially the bottom of the bed, overlying 
the cornstone. From this place I have procured one 
nearly entire specimen of the old fish, Cephalaspis 
Lyellii, several fine heads of the same species, and a 
few shields of Pteraspis in a good state of preservation. 
On the opposite side of the valley is another quarry, 
from whence a spiny stem of a plant has been procured 
by It. Lightbody, Esq., and several of the strata are 
full of large fucoidal impressions. In the drive leading 
to Downton Hall, by Targrove, the lower cornstones 
are exposed in a deep cutting, and contain Pteraspis 
rostratus , Cephalaspis Lyellii , egg packets of Pterygotus , 
and fucoidal remains. About a mile and a half to the 
north-east of this place, near to the Birches farm, is 
another most productive quarry for Pteraspis Crouchii jj 
and Lloydii. Near Hay ton’s Bent I found a small 
portion of Cephalaspis asterolepis , the largest of the 
Cephalaspides , and near Hopton’s Gate, Dr. J. Harley 
procured several portions of Pterygotus. 
At the village of Bouldon, about three miles to the 
north of Hayton, the cornstone is again well exposed ; 
the most productive section is just .above the Old 
Furnace. Pteraspis and Cephalaspis are here most 
abundant, and many of the quarried stones are covered 
with impressions of carbonaceous remains, probably 
fucoidal, and I have generally observed that fish 
remains are most numerous where these most abound. 
At the bottom of the grey micaceous flaggy stones, 
which lie just above the lowest band of cornstone here 
exposed, casts of fish or crustacean tracts are found 
covering all the under surface of a smooth argillaceous 
bed, overlying a thin bed of clay, on which the 
impressions were made. They look like parallel rows 
of short elevated lines, sharp at one end, and in the 
