64 J. W. Jackson & W. E. Alkins — Quartzose Conglomerate. 



these beds. This may prove of some assistance in arriving at the 

 precise age of the limestones in question. The specimen, which is 

 unfortunately rather imperfect, was obtained from a large block of 

 limestone in a quarry worked for road-metal on the western side 

 of the Low, midway between the lied Lion Inn and Cauldon village. 

 Other blocks in this quarry contained numbers of Chonetes cf. 

 comoides, Bellerophon, and Productus humerosus (P. sublcevis) of two 

 forms — one strongly convex and narrow with a broad shallow 

 depression down the centre of the back; 1 the other broader and 

 flatter with a similar depression down the back, from which later on 

 a low central ridge bearing spine-bases arises : these spine-bases are 

 also visible on the umbonal portion of the depression, and on the 

 ears. 2 



The coral, which consists almost entirely of the calix, is distinctly 

 Caninoid in character, and measures about 32 mm. in diameter. It 

 is apparently closely related to Caninia cylindrica, mut. S 1; as 

 figured by Dr. Vaughan in 1905. 3 



Regarding Productus humerosus (= sublcevis) Dr. Vaughan states 4 

 that in the Franco-Belgian area an early smooth form occurs at the 

 top of C 2 - In the South- Western Province this form is very rare, 

 but is recorded from the C2-oolite of Burrington. In the Clitheroe 

 region this early form enters at the top of Cj and forms a persistent 

 band at the top of C 2 (as in Belgium). Productus cf. sublcevis is also 

 recorded from the Lane Limestone (co. Dublin) = Cj. This lime- 

 stone underlies the Lane Conglomerate = C 2 , and both were formerly 

 regarded as D. 6 Most of the Caldon examples we have seen agree 

 closely with Vaughan's figure of the early form from the Franco- 

 Belgian area, 6 and with a specimen from Twiston, Lanes, in the 

 collection of one of the writers (J. W. J.) ; but there is the broader 

 spinous form to be considered. 



It is unfortunate that more definite conclusions cannot be given as 

 to the age of the quartzose conglomerate and its relation to the 

 Mumerosus-beds of Caldon; but we are hoping that, in the near 

 future, quarrying operations will expose further sections which will 

 provide us with more conclusive evidence. 



The material dealt with in this paper will be deposited for future 

 reference in the Manchester Museum. 



1 Cf. Q.J.G.S., vol. lxxi, pi. vii, fig. 8, September, 1915. 



2 Cf. Davidson, Monograph, pi. li, figs. 1, 2. The original of fig. 2 is 

 stated by Davidson, p. 234, to have been found at Caldon Low. 



2 Q.J.G.S., vol. lxi, pi. xxiii, fig. la, 1905. 



4 Q.J.G.S., vol. lxxi, p. 47, 1915. 



5 L. B. Smyth, Scient. Proc. Roy. Dublin Soc, N.S., vol. xiv, No. 41, 

 August, 1915. 



6 Q.J.G.S., vol. lxxi, pi. vii, fig. 8, 1915. 



