THE DEVONIAN ROCKS OF ILFRACOMBE. 
105 
Beds, E.S.E, After a little search, ray companion found a specimen 
of the disputed fossil, which I now exhibit, and it will be seen that 
in its general outline and the number of its coils, it agrees with the 
Clymenia figured in Sowerby. But owing to its compressed state, 
and the absence of lines marking the sutures, it is impossible to 
give its specific name. Here I was fortunate enough to discover 
remains of Crinoids, a cast of a Sponge, which had not been before 
seen in this quarry, as well as a couple of specimens of a small 
Euomphalus. Attention is invited to the structure of the rock, 
which I think you will all agree with me is altered sandstone, 
having been evidently subjected to intense heat, perhaps, by the 
intrusion of the granite of Dartmoor, which is not so very far 
distant. 
To the east of this hill is a large quarry of limestone, now 
filled with water—the Venn Quarry. This place is noted for the 
specimens of Posidonomya, a Lamellibranch fossil, or, as it is 
called in Ramsay’s “ Physical Geology,” Anodonta Jukesii , of 
which I was fortunate in being able to obtain a few specimens. 
The rock in which these fossils occur, I am inclined to think, 
belongs to the upper series of the Carboniferous formation, com¬ 
monly called the Yoredale Rocks ; but it is impossible to speak at 
present with any certainty upon this point, as I was not able 
to obtain a good section at this place, the quarry being full of 
water, and the time at my command did not allow of a thorough 
examination of the neighbourhood. 
Proceeding to the south-west of this spot, at a distance of three 
miles from Bideford, I was shown the sandstone of the Coal Measures 
in a quarry at Abbotsham, in which various fossil plant remains 
are to be found. Here I obtained specimens of Sigillaria, Dadoxylun, 
&c. The rocks in which these fossils occur have been very much 
tilted up, so much so that the strata are quite perpendicular. These 
rocks stretch across the country in a perfectly straight line from east 
to west, and they have been examined at various points by my 
friend, Mr. Hambling, who found in more than one place anthracite 
coal. One of these he discovered by asking a labourer where he 
got the black stuff from, which he used for paint ? 
May, 1893. 
