﻿Vol. 64.] IN THE CAKBONIFEROTJS ROCKS AT LOTJGHSHINNY. 441 



In the 

 South- 

 Western 

 Province. 



K 



C-S,. 



Abundance of Z. Omaliusi} 



('(1) Micheliniact mega- 

 Entrance and J stoma. 

 abundance of (2) Oyathophyllids. 

 [(3) Lithostrotion. 

 Entrance (and rarity) of (4)Clisiophyllids 

 of Lithostrofion-ty]ie. 



Absence of (1), (2), (3), (4). 



At 



EusH. 



Abundance of Z. Omaliusi, 

 var. densa and Z. Oma- 

 liusi, var. amhigua. 



Absence of (a), (h). (c) (not- 

 withstanding the great 

 thickness of the series). 



(a) Michelinia onegastoma (common). 

 (/;) Lithostrotion cyathophylloides 



(abundant). 

 (c) Clisiophyllids of Lithosirotion-tjT^& 



(rare). 



Rush Slates 

 {Zaphrentis-Beds). 



Eush Conglomerate 

 {Michelinia cf. megastoma-Beds). 



The following newly-discovered facts throw considerable doubt 

 upon the foregoing correlation : — 



(a) Zaphrentes, identical with those of the Rush Slates, occur in 

 equal abundance near Colne and in the Lane Limestone, and in 

 both cases the horizon is probably D. The similar forms which 

 abound in Z^ exhibit obvious differences.^ 



Nevertheless, Z. Omaliusi, var. densa is the prevalent Zaplirentis 

 in C, and Z. Omaliusi, var. amhigua occurs in D^ (no Zaphrentes 

 being yet known from the S beds of the South-Western Province). 



(6) A specimen of Michelinia tenuisepta, found loose near the top 

 of the Rush Conglomerate (near R 12 b), is identical with the form 

 common in the Oi/athaxonia-Beds here assigned to Ds^,, and is not 

 known from the C-S^ level. 



(c) Clisiophyllum cf. ohlongum bears a much closer resemblance 

 to the highly-developed Clisiophyllids of D than to the Lithostrotion- 

 like Clisiophyllids of S^. 



(d) Michelinia megastoma (Phill.) is probably a D species ; the 

 megastomatids of C-S,, both in the South-Western Province and at 

 Arnside, belong rather to M. grandis, M'Coy. 



(e) The new Productus — Productus cf. Jimbriatus, Rush paper, 

 pi. XXX, fig. 6 — from the top of the megastoma-heds, occurs 

 commonly in P (L 5). 



On the other hand : — 



(a) The dominant coral of the megastoma-heds and of the 

 Carlyan Limestone — Lithostrotion cyathophylloides — is markedly 

 more Cyathophylloid than Lithostrotion cf. afflne of the DP phase, 



^ See Quart. Journ. Geol. Soc. vol. Ixii (1906) p. 314. 



