Vol. 59.] AND LOWER LIAS OF SEDBUET CLTFE. 395 



EXPLANATION OF PLATE XXIV. 



Vertical section of Sedbury Cliff, on the scale of 20 feet to the inch. 



Discussion. 



Mr. Hudleston drew attention to Bed 15 of the Lower Khaetic in 

 the Author's section. It was important to notice that in this area 

 the sandstone (Bone-Bed) contained masses of ' Tea-green Marl.' 

 Since it was held by some that these ' Tea-green Marls ' actually 

 formed a portion of the Khaetic, the inclusion of derived masses of 

 the underlying bed helped to corroborate the late Edward Wilson's 

 view, which entirely dissociated these ' marls ' from the Khaetic 

 Series. Eecently a paper had been read before the Society, wherein 

 the author included the green marls, 1 as a matter of course, in the 

 Khaetic. Owing to criticisms made at the time, he (the speaker) 

 had been assured by Bristol geologists that additional evidence was 

 forthcoming in that district in conformity with Edward Wilson's 

 views, which he desired to emphasize. 



Mr. H. B. Woodward remarked that the previous speaker had 

 raised a controversial matter that had been pretty well thrashed-out. 

 The Tea-green Marls were no doubt passage-beds between the Keuper 

 and the Khaetic. If one went a little farther south, one would find a 

 bone-bed in these green marls, and in going westward to Bridgend, 

 in South Wales, one would find red marls on the horizon of the 

 Upper Khaetic, as noted by Tawney, and lately confirmed by the 

 officers of the Geological Survey. Ked marls also occur on a similar 

 horizon in Antrim, as observed by the late Ralph Tate. He agreed 

 with the Author in regard to the conglomerate at the base of the 

 Lias. In the Bristol district and northward there was evidence of 

 erosion of the White Lias. He regarded the Est7ieria-Be& of West- 

 bury-on- Severn as probably representing the Gotham Marble : it 

 contained arborescent markings. 



Mr. Whitakee said that, so far as the Bristol area was con- 

 cerned, he agreed with the late Edward Wilson that the Tea-green 

 Marls were perfectly distinct from the Khaetic, and belonged to the 

 Keuper. He cited in confirmation Hebert's opinion as to the 

 section at Aust Cliff, and remarked that he could not sufficiently 

 deprecate the differentiation of beds by colour alone. 



1 [A. J. Jukes-Browne, Quart. Journ. Geol. Soc. vol. lviii (1902) pp. 281-82.] 



