Lethaea rossica ou paléontologie de la Russie. Second by Eichwald E. PDF

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Additional info for Lethaea rossica ou paléontologie de la Russie. Second volume. Période moyenne. Texte

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12. Les feuilles fossiles courtes sont élargies à leur base et pointues à * Comparez les figures 14 de la Pl. 18 du Thuja occidentalis, fig. 2 ; Pl. 22 du Taxodites europaeus, et la fig. 6. Pl. 36 du Pinites Thomasianus dans la Monographie des Conifères fossiles de M. GOEPPERT. **• Voy. les Mémoires de la Soc. géograph. de St. Pétersb. 1856, vol. XI. 5i leur extrémité ; elles sont épaisses et convexes, à carène médiane dorsale et à deux nervures latérales de chaque côté de la carène. Hab. dans le grès néocomien de Kline (ou Klenowka) et de Lytkarino près de Moscou, ainsi que dans le gault de Louschitz en Bohème.

La surface de la tige est pourvue de côtes épaisses, comme celle des Calamités ordinaires, mais elle est finement striée au jeune âge, et par là les petits individus ressemblent aux Equisétacées. La tige silicifiée des grands individus, dont l'un, figuré en grandeur naturelle sur la Pl. V, fig. 6 , se trouve dans la collection de M, AUERBACH à Moscou, se compose de l'écorce d'une épaisseur de trois lignes, et de la moelle centrale beaucoup plus large. L'écorce présente deux couches, * VERNEUIL, Paléontol.

Il a observé, comme M. GOEPPERT, de doubles rangées de pores et jusqu'à 2 5 et plus de rayons médullaires dans le bois fossile, qui est presque partout rongé par des Fistulanes; le bois de Koursk est silicifié et les Fistulanes changées en calcédoine; il a souvent l'épaisseur 1 de 1 /2 pouce et au delà ; sa longueur est très considérable. Le con- glomérat néocomien qui le contient, rappelle beaucoup le Hils-conglomerat. En d'autres endroits le bois est pénétré par une roche, calcaire ou argileuse, et modifié dans sa forme extérieure.

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Lethaea rossica ou paléontologie de la Russie. Second volume. Période moyenne. Texte by Eichwald E.


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