W. Pengelly— Cavern Exploration in Devonshire. 801 
The conclusion I arrived at, after studying so much of the 
roof of the cavern of 1858 as remained intact, was that Dr. 
Buckland’s opinion was fully borne out by the facts; that, in 
short, the Oreston Caverns were Fissure Caverns, not Tunnel 
averns. 
Thecavern of 1858 was an almost vertical fissure, extending a 
length of about ninty feet from N.N.E. to S.S.W. 
menced at about eight feet below the surface of the plateau, 
continued thence to the base of the cliff, but how much farther 
was not known, and its ascertained height was about fifty-two 
feet. It was two feet wide at top, whence it gradually widened 
to ten feet at bottom. The roof, judging from that part which 
had not been destroyed, was a mass of limestone-breccia, made up 
of large angular fragments cemented with carbonate of lime, 
and requiring to be blasted as much as ordinary limestone. 
The cavern was completely filled with deposits of various 
lar stones, but otherwise perfectly homogeneous, and known to 
eae much more was undetermined. 
€ osseous remains found at Oreston prior to 1858 have 
been described by Sir E. Home, Mr. Clift, Dr. Buckland, nee 
ig en 
hippopotamus, I can only say that I have never met with satis- 
factory evidence of its occurrence in Devonshire; but the 
