534 PKOCEEDIN-GS OF THE GEOLOGICAL SOCIETY. 



should be recognized as the '^ Ehsetic Series/' the propriety of which, 

 when the vertebrate remains from the latter beds are described, will 

 be more clearly seen. 



M. Jules Martin, in his ' Paleontologie Stratigraphique de 1' Infra - 

 lias de la Cote-d'Or, recognizes the above term, and also M. Terquem 

 for beds in Luxembourg and Hettange, and M. Deslongchamps for 

 those of the " calcaire de Yalogne." 



Dr. Duncan follows them when he notices the Corals and other 

 remains with which I have supplied him in his '^ Madreporaria of 

 the Infralias of South Wales." Commencing the Lower Lias with 

 the beds containing Ammonites BucMandi and Gryphoia incurva, 

 between these and the Keuper three zones are proposed for the 

 Infralias, — the upper including the coralliferous deposits of Brocastle 

 &;c., in South "Wales, and also the horizon of Ammonites angulatus. 

 The second includes the zone of Ammonites jolanorhis and the " White 

 Lias " in part (Wright) ; whilst in the lower zone he gives the '' White 

 Lias " in part (Moore), and the other beds to the Keuper, — all of 

 which I propose to include in the Ehsetic series. My proposal 

 always was to include the whole of the " White Lias " with the 

 latter. They are a compact mass of limestones, as a reference to 

 my sections will show, with the same lithological and paleeontological 

 conditions throughout ; and as there is no possibility of separating 

 them into horizons, they must all be classed together ; and I think 

 I have shown suf&cient reason, when describing the Camel and 

 other sections, why my classification is to be preferred. I do not 

 agree with Dr. Duncan's horizons for the South Wales coralliferous 

 deposits, since those of Laleston, Cowbridge, and Llanbethian are 

 in the Ostrea-beds and below the Ammonites-planorhis zone, whilst 

 that of Brocastle, from its containing an abundance of Gryplu^a in- 

 curva, must, I think, be placed above the horizon to which he has 

 assigned it. 



It is very certain, from the descriptions given by the above authors 

 of the several continental " Infralias " deposits, that the beds are 

 very feebly represented when compared with the Lower Lias of this 

 country. In the district of the Cote-d'Or, they are deposited un- 

 conformably upon, or within the influence of, a granitic coast-line, 

 and not only is there much unconformability, but the beds are much 

 mineralized and metamorphosed, those of I^olay and Thorte being 

 sufficiently ferruginous for the manufacture of iron, whilst galena, 

 manganese, and other minerals are at times present. The greatest 

 thickness described by M. Martin at Pouillery for the " Infrahas," 

 including the Rhsetic beds, is but 10 feet, many of the sections being 

 still thinner. 



M. Terquem, in his description of the beds of Hettange and Luxem- 

 bourg, also points out the presence of much unconformabihty. In 

 the direction of Loevelage to d'Arlon, the " Infralias " beds are 

 wanting, and the Griiplicea incurva or Ammomtes-BiicMandi beds 

 repose upon the Keuper ; and he also states that in the Moselle, though 

 not in Luxembourg, the " Infralias " begins with the bone-bed, from 

 which it appears that, though so persistent in this country, the Ehsetic 



