222 REPORT— 1902. 



(a) From top shales N. of Mam Tor to top black limestone . 150 feet (see p. 217) 

 (h) Estimated thickness from base of (a) to top of (c). . 40 „ 



(c) Thickness of section (3) 140 „ (see p. 218) 



330 



(d) Section (4) shows 74 feet, which is believed to be below (o) 



(e) Section (G) shows 36 feet 



110 feet 

 Total thickness open to investigation, 440 feet. 



A List qf the Fish Fauna of the Pendleside Limestones, With Remarks on 

 the Evidence u^hich may he adduced from such List in support of the 

 Systematic Position of the Eocks. By Edgar D. Wellburn, F.G.S., (be. 



Remarks on the List. 



On glancing through a list of the fossil fishes of the Pendleside Lime- 

 stones, one is at once struck with the great similarity of the fauna to that 

 of the Millstone Grits, and through them, to a great extent, to tliat of the 

 Lower Coal Measures above. On the other hand, when we compare the 

 list with that of the true Yoredales (Phillips) and the Mountain Lime- 

 stones below, the great dissimilarity is at once apparent, there being a 

 decided and great break in the fauna of the two groups of rocks, the 

 dividing line being at the base of the Pendleside Limestones ; and this 

 being so, in my opinion, the division of the Carboniferous rocks should be 

 at the base of the Pendlesides, they being classed along with the Millstone 

 Grits and Coal Measures in the Upper Carboniferous, whereas the true 

 Yoredales and Mountain Limestones should constitute the lower division.^ 



If we go into the matter more closely, and take the genera in the list 

 and compare them with those found in the rocks above, we find that the 

 following pass up into these rocks, but are not found in the true Yoredales 

 and Mountain Limestones below, viz., Acanthodes, Marsdenius, Strepsodus, 

 Rhizodopsis, Ccelacanthus, Rhadinichthys, Elonichthys, Acrolepis, and 

 Platysomus. 



Again, the genera Cladodus and Orodus are very rare in the Pendle- 

 sides and Millstone Grits, but very plentiful in the rocks below, and they 

 appear to have rapidly died out and become extinct in the Upper 

 Carboniferous rocks ; and yet again, although I have found the Lower 

 Carboniferous genera Psephodus, Pristodus, and Pcecilodus in the Millstone 

 Grits (but not in the Pendlesides), still they (the teeth) are extremely rare 

 when compared with the other genera, as I have only found a single 

 specimen of each. They are also of small size — when compared with 

 those found in the Lower Carboniferous rocks, where they are very 

 abundant — and the fishes appear to have become extinct in the Millstone 

 Grits ; as far as I know they have not been found in the Coal Measures 

 above. 



Many of the fossils have been too fragmentary to be worth preserva- 

 tion. A complete series has been sent to the Geological Museum, 



It is the writer's intention to deal more fully with this subject later. 



