THK RII.KTIC KOCKS AT PYLLK II ILL. 549 



The occurrence of plant-remains in the '* Tea-«j:reen Marls *' is a 

 matter of somo interest ; unfortunately the state of their ])reserva- 

 tion is too imperfect to admit of their affinities heing determined 

 with precision. 



I am indehted to the (ireat Western Hail way Company for per- 

 mission to examine the railway-cuttinp: at I'ylle Kill, and to j\Jr. 

 W. K. Lawrence, Engineer to the Bristol Relief liailway, for the 

 section from which the diagram illustrating this communication 

 has been constructed. 



Discissiox. • 



Mr. Ethekidge congratulated Mr. Wilson on the careful way in 

 ■which he had worked out the new section or the Ehaetic beds at 

 Pylle Hill, ne[ir Jiristol, which forms a continuation of the bed 

 exposed nearly forty years ago. The Author had added several 

 new species to the fauna of these shales and limestones, and discussed 

 the question of the Tea-Green Shales, so named by the Geological 

 Survey, and their relation to the Eed Marls below and the Black 

 Shales above. The vertical section prepared by the Author was 

 mainly the same as those well known at Westbury, Penarth, and the 

 exposures in Somersetshire and Gloucestershire long ago published 

 by the Survey, and also others in ^Nottinghamshire and Leicestershire 

 carefully worked out by the Author himself. 



Mr. H. B. WooDWAKD remarked that the Gotham Marble occurred 

 at the base of the White Lias near Bath, and it was not clear that 

 the bed marked as its equivalent in the Author's section was 

 really on the same horizon. Several layers of similar texture 

 occurred in the White Lias. However, he was prepared to believe 

 in a certain amount of overlap of the White Lias by the Lower Lias 

 in parts of Gloucestershire and Warwickshire. In the latter county 

 the " Guinea-bed " appeared to be a remanie layer at the base of the 

 Lower Lias, containing as it does E-ha^tic as well as Lower-Lias 

 fossils. \\'ith regard to the Grey or Tea-Green Marls he admitted 

 that it was mainly a matter of convenience that they were mapped 

 by the Geological Survey with the Rhcetic beds ; in some localities 

 they are more closely connected with the variegated Keuper Claris, 

 but in other localities they are quite as iutimatelj' connected with 

 the overlying Rhsetic shales. 



The llev. H. WixwooD alluded to the difficulties attending the 

 examination of these beds, and the industry show^n by the writer in 

 working out their contents. Whatever might be the position of the 

 Gotham Marble in this section (which must be admitted to be 

 abnormal), in most, if not all, of the typical sections in the Bath 

 district it invariably came in at the base of the White-Lias rubbly 

 beds, and overlying the shales. He was glad to find corroborated 

 Charles Moore's view that the White Lias belonged to the Bhietic 

 formation. 



Prof. T. BuPERT Jones mentioned that the llhgetic ostracoda from 

 Pylle Hill, which the Author had sent to him for examination, 

 probably represented two species belonging to the genus Daricinida, 

 of brackish-water habitat. 



2(i2 



