GEOLOGY OF SOMERSET. 135 
at the base, and bringing down large masses, from 
time to time, at no great intervals. The strata 
of the beach are much contorted; Mr. Horner 
in his geological survey before alluded to, says, 
“It would be impossible by any description of 
particular instances of disturbance, to give an in- 
telligible representation of the extraordinary ap- 
pearance of the coast, in walking over it at low 
water. I cannot better convey an idea of it, than 
by comparing it to the great waves of the sea 
suddenly consolidated. These waves now broken 
in many directions exhibit various sections of their 
internal structure.” 
The lias of our district is not so rich in organic 
remains, I believe, as the same formation at Lyme 
Regis. However, ichthyosauri and plesiosauri have 
been found as nearly perfect skeletons, those from the 
vicinity of Street and of Watchet being probably the 
most perfect. Bones of pterodactylus have also occur- 
red. Pentacrinites, echini, ammonites, and nautili, 
and numerous species of bivalve and univalve shells 
are abundant. On the beach near Blue Anchor are 
multitudes of compressed ammonites, having the 
beautiful irridescent nacre. The bone or coprolite 
bed has been found, I believe, wherever the lower 
strata of the lias have been reached. 
The different members of the oolite formation 
extend across the eastern part of the county, from 
the neighbourhood of Castle Cary to that of Bath. 
Inferior oolite caps the lias hills of Dundry, Glas- 
