454 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 22, 



intervals on the coast all the way from the mouth of the Fowey river 

 to the towns of Looe, and thence along the shores of Whitesand Bay 

 to the Rame Head, and up the river Towey to as far as Cliff and 

 the parish of St. Yeep. I have found it in the slaty limestone of 

 Milladon near St. Germans ; and Mr. Pengelly has met with it in Mud- 

 stone Bay, and at Bedruthen Steps near Padstow. It ranges, there- 

 fore, through the whole of the beds from the calcareous rocks of St. 

 Germans to the base of the Plymouth and Torbay limestones. The 

 genus, therefore, although more particularly characteristic of the 

 Lower Old Red, appears to pass up*. In the fine series of fish-re- 

 mains in the collection of Mr. PengeUy, I noticed at least four or 

 five other species, exclusive of the Philhlepis coiicentricus, all from 

 the Looe-river group of beds ; and these remains appear to indicate 

 an epoch during which, from their frequent occurrence, fish must 

 have been abundant. 



I leave the coordination of these rocks with the typical groupings 

 of North Devon to those who are better acquainted with the latter, 

 the chief object of this communication being rather to endeavour to 

 establish the relations of the beds, or groups of beds, south of the 

 Culm-measure trough among thgmselves; and as regards the re- 

 sults, stated generally, they accord pretty nearly with those of the 

 authors of the Devonian system as enunciated in the first of their 

 memoirs f, although differing somewhat in details, — the whole of the 

 beds, from the St. Germans and Ashburton range of limestones to 

 the top of those of Plymouth and Torbay inclusive, correspond- 

 ing with their group !N'o. 2, the red argillaceous and gritty beds 

 which are seen passing under the Triassic rocks of Painton, and 

 which occupy in force the whole of the Kingsbridge promontory, ex- 

 clusive of the metamorphic rocks, being represented by their groups 

 3 and 4. 



But, assuming that the rocks included between the base of the 

 Ashburton and the top of the Torbay limestones (the group l^o. 2 of 

 Sedgwick and Murchison) represent the calcareous portion of the 

 nfracombe group of I^orth Devon J, then the red rocks of Blagdon 

 Cross and the Kingsbridge promontory would in all probability cor- 

 respond in position, as they do to some extent in lithological cha- 

 racter, with the Upper and Morthoe portions of the same series ; while 

 the rocks brought up around Kingston Down and in the vicinity of 

 Buckland Monachorum would represent the lowermost portion of 

 the Ilfracombe group, and the yet older rocks of St. Breock's Down 

 would find their analogues in the Hangman Grits. 



* Both Pteraspis and Cepkalaspis occur in the Old Red high up in the Great 

 Skirrid Mountain, and in the tow-n of Abergavenny, in beds which, unless some 

 great undiscovered fault exists, cannot be more than 1000 feet belov7 the base of 

 the Carboniferous slate of the South Welsh coalfield. 



t i. c. p. 668, et seq. 



l Tide Mr. Etheridge's Memoir, previously cited, pp. 604 & 605. 



