Geological Society. ^7 



The green-sand is succeeded by a lower formation, which the authour 

 lefers to the Jura-limestone or oolite. In this he has found, occasionally, 

 TerehratulfjR ; in addition to which, Mr. Allan states that it contains am- 

 monites, pectens, an echinus, and, near the lighthouse at St. Hospice, 

 numerous corals. In mineralogical character, this stratum is very unlike 

 the English rocks which it is supposed to represent ; its principal mem- 

 bers being compact limestone, with, occasionally, flint, dolomite, and 

 gypsum. 



Dec. 5. — A paper was read, On the Excavation of Valley s^ as illus^ 

 trated by the Volcanic Rocks of Central France^ by Charles Lyell, Esq., 

 V.P.G.S., F.R.S., &c. and R. I. Murchison, Esq., For. Sec. G.S., F.R.S., 

 ■ &c., wherein was included a detailed account of the deposits at Mont- 

 Perrier or Boulade ; where the fossil remains of various extinct quadru- 

 peds are found, alternating with beds of transported materials of different 

 kinds, which rest against the sloping side of a hill to the height of be- 

 tween 200 and 300 feet. This hill itself is essentially composed of ter- 

 tiary marls, capped with basalt ; but the basalt does not here overlie the 

 alluvions, as has been asserted. Since the sand and gravel containing the 

 fossil bones, found on two different sides of the mountain, are overlaid by 

 a vast mass of trachytic breccia, it is concluded, that the Elephant, Rhi- 

 noceros, Hippopotamus, Hysena, Tiger, Wild Cat and other quadrupeds, 

 whose remains have been recently disinterred, must have been inhabitants 

 of this district, before the most recent cones and lavas of Auvergne had 

 appeared, or the valleys had been excavated to their present depth; and 

 even before the fires of Mont Dor were extinguished. 



Jan, 2, 1829. — A letter was read, addressed to R. I. Murchison, Esq., 

 For. Sec. G.S. &c. by G. W. Featherstonhaugh, Esq., F.G.S., On the 

 Series of Rocks in the United States, in the course of which the authour 

 remarks, that no regular search for bones has yet been made in the caves 

 of the United States. The only fossil bones hitherto found in any cave in 

 that country, are those of the Megalonyx ; although the bones of the 

 Megatherium, Elephant, Mastodon, Ox and Horse, have been discovered 

 in other situations. But so Httle attention has been paid to the circum- 

 stances under which these remains occurred, that it is impossible to decide 

 whether they were lodged in alluvial or diluvial deposits. In the authour's 

 opinion, no fossil remains of the Hysena, Rhinoceros, Hippopotamus, 

 Bear, or Tiger, have ever yet been found in the United States. 



