Geological Society. 511 



of this place, but he was presented by M. Millet with an extensive 

 suite of shells and corals, collected by that gentleman. Of fifty- 

 seven species of Testacea, all but thirteen occur in the Faluns near 

 Tours, Savigne and Pontlevoy ; but the fact of there being thirteen 

 peculiar to the Angers district induces Mr. Lyell to suspect that the 

 fossils depart more than those of other localities from the common 

 type. The collection contains also only nine species which can be 

 positively identified with known recent shells, and one which is 

 doubtful, giving about seventeen per cent, of existing species, a much 

 smaller proportion than was obtained by the author in other localities. 

 Doue. — At this town are extensive quarries of a calcareous build- 

 ing-stone, composed of comminuted shells and corals, and exposed 

 to the depth of forty feet. The beds are horizontal, but exhibit 

 highly inclined cross- stratification. From the marl-beds at La Gre- 

 zille, and the calcareous sand and limestone of Renaudan and Illet, 

 villages situated six or seven miles north of Doue, Mr. Lyell pro- 

 cured twenty-four species of corals, four of Echinodermata and three 

 of fishes ; also a few Species of shells, the most conspicuous being the 

 large Pecten solarium. In the great abundance of corals and Echi- 

 noderms, and the small number of IMollusks, Mr. Lyell states that 

 this deposit presents a perfect analogy to the white or coralline crag 

 of Suffolk ; but that its fauna is as distinct, with respect to species, 

 from the fauna of the coralline crag, as the other localities of the 

 Faluns of the Loire generally. 



Savigne. — Between Doue and Savigne the country consists partly 

 of the Eocene freshwater formation, which extends thence almost 

 continuously to Paris, and partly of Craie titfeau. Near Savigne the 

 Falun is composed of limestone, containing most of the Doue fossils. 

 The result of Mr. Lyell's labours in this neighbourhood gave the 

 following amount of organic remains, obtained chiefly from a pit 

 which he had made near the point where the road from Savigne to 

 Channay divides from that leading to Courcelles. The total number 

 of species of corals which have been determined amounts to eighteen, 

 of Echinodermata to two, of Testacea to seventy-six, and of fishes to 

 four. Mr. Lyell also obtained an upper molar of a deer, and a molar 

 of the Chceropotamus Cuvieri. Of the shells, only ten species were 

 not found by the author at other Falun localities near the Loire ; and 

 twenty-three species, or about thirty per cent., have been identified 

 with recent shells. Among the fishes is Lamna contortidens, a spe- 

 cies which occurs in the Suffolk crag. The tooth ascertained by 

 Mr. Owen to belong to the C. Cuvieri, affords, Mr. Lyell states, an- 

 other instance of a mammifer common to Eocene and Miocene jie- 

 riods. 



District south of Tours. — The immediate neighbourhood of Tours 

 consists of cretaceous valleys, with intervening platforms of Eocene 

 freshwater strata. The Faluns occur from twelve to sixteen miles 

 to the south, at Louans, Manthilan and Bossee. At Louans the de- 

 posit is exposed in pits from four to five yards deep, and consists of 

 white and yellow marl, formed, to a great extent, of comminuted 

 shells and corals. From this bed Mr. Lyell obtained 180 species of 



