147 



that "tlie Lower Lias is represented at Lussay by a greenish 

 micaceous Sandstone overlaid by a hard blue Limestone on which 

 rests a bed of Corals {Isastroea Murchisonoe, Wr.) wrapped up 

 in a dark Mudstone, the Coral very closely resembling a species 

 found in the Lower Lias of Warwickshire. The Coral bed, 

 three feet in thickness, is overlain by calcareous Sandstone 

 and blue compact Limestones. Unfortunately no Ammonite 

 has been found in these beds, so that their precise age cannot 

 be determined; still, however, the presence of Cardinia concinna, 

 Ziet., is, per se, good evidence that the greenish micaceous 

 Sandstones with Cardinia, belong to the Lower Lias, as that 

 shell is found only in the lower beds of France and Germany, 

 its true position in Wurtemberg having been ascertained to be 

 below the Bucklandi bed where it is associated with Ammonites 

 angulatus, Schloth." In the Lower Lias of Warwickshire I 

 have found several large masses of Septastra Haimei, Wr., the 

 precise position of which I could not accurately determine; but 

 in the A. planorhis beds at Street I extracted the same species 

 from the clay in situ. Lias Corals have long engaged the 

 attention of my friend the Rev. P. B. Beodie, whose cabinet 

 contains a very fine series from these beds, and his observations 

 thereon are recorded in a paper on that subject." Dr. Duncan^^ 

 has very recently made an important contribution on the 

 Madreporia of the Lower Lias ; from this we learn that Brocastle 

 and Ewenny are localities a short distance from Bridgend in 

 Glamorganshire, which have yielded fossiliferous Uassic deposits 

 resting on the mountain Limestone, and filling up depressions 

 on its STU'face. The Coral fauna consists of Isastroea glohosa, 

 Dune, and several species of Astroccenia, Thecosmilia, Montlivaltia, 

 Latomeandra, Cyathocxnia, and Septastrcea. The Sutton stone 

 and Southemdown beds have likewise yielded many Corals. 

 All these different formations (about the respective ages of 

 which opposing opinions prevail) Dr. Duncan co-relates with 

 the Calcaire de Valogne, the Foie de Veau, or the zone of 

 Ammonites Moreanus, and the Crres calca/rewi, which are the 



" Edinburgh New Philosophical Jour., April, 1857. 

 1- Quar. Jour. Geol. Soc, vol. xxfii, p. 12, 1867. 



