Argiles de Speeton et leurs équivalents by Pavlow A., Lamplugh G.

By Pavlow A., Lamplugh G.

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V (III, Bg. 8. 1837. BelemnÎfes absolufl/s Fischer. Oryctogr. p. 173. Pl. 49, fig. 2. 1845. Belemnifes t'olgensis d'Orb. Gélliogic de la Russie, p. 419. Pl. 28, fig. 1-14. -:::0 1 i: t age s. Es p (' ces. ~ cf. " Fisch. (Speeton), Fisch. (Russie). Coprolite Bt>d E. Portlandien inf. B. jll/t/lS Couches F. Kimméridgien. B. , B. lS B. , B. l'Un·felu ... OIfordien et callovien supérieur. B. , B. Pllzo... , B. <'r-us Phil. Callovien mOlen et inf~riellr·. B. , B. B. ~I/," ~ik. n. , Pbil. lues entre elles comlllè suit: B.

Terr. , p. 117. Pl. 16, fig. 1-6. 1845. lJelemnites borealis d'Orbigny. Géologie de la Russie, p. 420, Pl. 28, fig. 15-20. 1870. ~tensus Sintzow. Aperçu géologi(IUe du gouv. de Saratow. Bull. Soc. -Pétersboug, 2 série, Yol. 5. Pl. VI, fig. 2, 3, 4. Rostre allongé, très distinctement comprimé dans sa longueur, surtout dans sa moitié supérieure; s'atténuant peu à peu dans sa ') G. W. Lamplugh. On the snbdhisiolls orthe Speetoll Clay. Q. J. :\i 180. G~ol. Soe. - 39moitié inférieure, et se terminant par une pointe ridée en long dans les échantillons bien conservés.

44, Pl. IV, fig. 1 et 2. Rostro gros et court, déprimé, ('onsidéraùlement aplati sur le ...... >bruse, recourbée un peu vers le côté ventral ct ridée en long ~ans les échantillons très bien eonservés; à sillon ventral large et peu profond, qui, par l'exfoliation des lames, se prolonge le long -cie toute la région ventrale, ou ne présente qu'un petit enfonceme nt 4· - 52- au-dt'ssus de la pointe (il est à peine marqué chez les jeunes) .. Ouverture plus large que haute, aplatie /'n dessous et un peu sur les lIanc~, arrolll:ie en dessus.

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