THE GEOLOGIST. 



17 



Lloydii, and the seed vessels Parkia decipiens, so well known 

 in the Old Red of Scotland. We have not done with the 

 Euiyptenis yet ! At the very summit of the Comstones, high up 

 on Rowlestone Hill, near Abergavenny, the Eurypterus has again 

 been found, and these beds are two thousand feet or more above 

 the Kington Tilestones.* 



Let us now turn to the evidence afforded by the fishes of this 

 remote epoch. We have already seen that the Onchus Murchisoni 

 was contemporaneous with the Crustaceans that existed with the 

 Comstone fishes, and we know that the lowest Old Red strata of 

 Scotland, contain their wing-finned fishes, the Ptericthys, and that 

 these beds are considerably lower than Scotch strata, which envelope 

 the Cephalaspis Lyellii, &c., so that we may very fairly argue, that 

 the Ptericthys was contemporaneous with the fishes of the 

 Tilestones, and with the Onchus Murchisoni. 



Now in Scotland, the Ptericthys has been found in the Yellow 

 sandstones, at the summit of the Old Red, and the base of the 

 Coal measures ; and near the Clee Hills, in Shropshire, Mr. Baxter, 

 of Worcester detected a specimen in good preservation, in yellow 

 sandstone, below the Mountain limestone, and the equivalent 

 as regards age, of the Dura Den beds of Scotland, and the 

 Cyclopteris sandstones of Ireland. Immediately above the 

 Ptericthys beds of the Clees, the Mountain limestone is crammed 

 with the palates and scales of Carboniferous fishes, and the yellow 

 equivalent sandstones of Ireland and Scotland supply us with the 

 Carboniferous fish, Holoptychius, and even the remains of 

 Megalicthys. Indeed the Geologists of the Irish survey, with Mr. 

 Jukes at their head, argue, and most fairly, that these yellow 

 Cyclopteris sandstones are Carboniferous rather than Old Red 

 deposits, nay, even that the so-called Old Red conglomerate is a 

 Carboniferous conglomerate, forming the base of the Carboniferous 

 deposits. 



Here arise two interesting questions ; where can the Geologist 

 point out a section in all our English district, where the " brown 

 stones " (Upper Comstones) are to be seen passing conformably 

 into the Old Red conglomerate ? and where, as regards Palseon- 



* See Edinburgli New Phil. Journal, October, 1857, p. 257. 

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