290 PEOF. T. G. BONNET ON THE [May I9OO, 



Of these (A) is a fairly flat slab (with a small portion broken off at 

 one end) coming from a smooth ellipsoidal pebble of a lig'ht-coloured, 

 slightly micaceous quartzite. It measures rather more than 5- 

 by a little less than 3| inches, the average thickness being nearly 

 1 inch. Lithologically it resembles those already found with this 

 species of Orthis in the Midlands, and, as Mr. Newton remarks,, 

 * is a typical Budleigh-Salterton pebble, 1 with the little Orthis, 

 specimens of which (more than a dozen in all) are seen on each 

 surface.' At that place, as the late Dr. Davidson remarked, this' 

 Orthis is the most abundant fossil : i occurs also in situ ... at Gorran 

 Haven in Cornwall . . . has been found by Mr. Perceval at Sparkbrook, 

 near Moseley, Birmingham ; by Mr. W. J. Harrison at Counter- 

 thorpe, about 5 miles south of Leicester; by Mr. Jennings near 

 Nottingham ; and by the Rev. P. B. Brodie in the Drift near 

 Warwick.' 2 I have found it, prior to 1880, on Cannock Chase. 3 

 It is abundant in Normandy at localities mentioned by Davidson,, 

 in beds of the age of the Gres de May (Bala). 



(B) is a fragment, measuring roughly 3| by 2| inches and \ inch 

 thick, from a flat pebble with a fairly smooth surface. It is a hard 

 gritty mudstone or fine-grained felspathic grit, of a reddish-brown 

 colour, reminding me of certain Upper Llandovery rocks. Mr. Newton 

 remarks : ' there can be little question as to this specimen being of 

 Upper Silurian age, and most probably Llandovery or Wenlock.' 



(C) Two small fragments from a rounded pebble of a rather 

 similar rock. The fossils are badly preserved, though apparently 

 rather abundant. Mr. Newton remarks : ' most likely Upper 

 Silurian.' 



A number of other sedimentary rocks, such as hard mud- 

 stones, may be mentioned here. They usually vary in colour 

 from olive-grey to brown, are sometimes slightly micaceous, occa- 

 sionally banded, and resemble sundry rocks of Ordovician or Silurian 

 age. Crinoidal chert occurs, but is rare ; also fragments of g r e y 

 limestone, this being, I think, more frequent near the base of the 

 conglomerate, where somewhat angular fragments are more common, 

 and the matrix is occasionally cemented by carbonate of lime. 

 One certainly, the other probably, represents the Carboniferous 

 Limestone. Traces of galena (rarely) and of malachite (more often) 

 may be detected. 



Feist ones. — Some varieties of the felstone-pebbles were de- 

 scribed in 1883, but I have collected many since that date. Alto- 

 gether I have found at least three dozen varieties or species, but 

 cannot speak more precisely, as I have mislaid the specimens from 

 which slices were cut prior to 1883. 4 Those subsequently collected 



1 The remark does not refer to the deposit as a whole, but to the fossiliferous 

 pebbles. 



2 T. Davidson, Palaeont. Soc. Monogr. 'Brit. Foss. Brachiop.' vol. iv (1874-82) 

 p. 360. 



3 Geol. Mag. 1880, p. 406. 4 Ibid. 1883, p. 199. 



