. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Nerita conoidea, Lam. Syn. JV Schmidelliana, Chemnitz. it accompanies the nummulitic formation from Europe to India, hav- ing been found in Cutch, near the mouths of the Indus, associated with Nummulites scabra. No less than 33 shells of this group are said to be identical with shells of the London clay proper, yet, after visiting Cuisse-Lamotte and other localities of the "Sables inferieurs" of Archiac, I agree with Mr. Prestwich, that the latter are proba
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Nerita conoidea, Lam. Syn. JV Schmidelliana, Chemnitz. it accompanies the nummulitic formation from Europe to India, hav- ing been found in Cutch, near the mouths of the Indus, associated with Nummulites scabra. No less than 33 shells of this group are said to be identical with shells of the London clay proper, yet, after visiting Cuisse-Lamotte and other localities of the "Sables inferieurs" of Archiac, I agree with Mr. Prestwich, that the latter are probably newer than the London clay, and perhaps older than the Bracldesham beds of England. The London clay seems to be unrepresented in the Paris basin, unless partially so, by these sands.* One of the shells of the sandy beds of the Soissonnais is adduced by M. Deshayes as an example of the changes which certain species underwent in the successive stages of their existence. It seems that different varieties of the Cardium porulosum are characteristic of different formations. Ear. Cardium porulosum. Paris and London basins. In the Soissonnais this shell acquires but a small volume, and has many peculiarities, which disappear in the lowest beds of the calcaire grossier. In these the shell attains its full size, with many distinctive characters, which are again modified in the uppermost beds of the calcaire grossier; and these last modifications of form are preserved throughout the " upper marine " (or Lower Miocene) LOWER EOCEXE FORMATIOXS OF FRANCE. Argile plastique (C. 2, p. 298).—At the base of the tertiary system in France are extensive deposits of sands, with occasional beds of clay * D'Archiac, Bulletin, torn. x.; and Prestwick, Geol. Quart. Journ., 1847, p. 377. \ Coquilles caracteristiques des Terrains, 1831. 20. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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