Memoirs of the Geological Survey of India . A. Gautama, Forbes., A. Mantelli, or an allied species,and Nautilus elegans, DOrbigny, which is one of the most characteristic species of the Trichi-nopoly group. Fossil woDd is tolerably abundant in the shales, but in small fragments shales are here succeeded by a mass of white granitic sands and gravels, the upperSands -with siUcifled wood. parts of which are of doubtful age, forming indeed the passage into^^ ^ ? the Arrialoor group ; and in these large logs of silicified wood are imbedded in a prostrate position, and quite untouched by th
Memoirs of the Geological Survey of India . A. Gautama, Forbes., A. Mantelli, or an allied species,and Nautilus elegans, DOrbigny, which is one of the most characteristic species of the Trichi-nopoly group. Fossil woDd is tolerably abundant in the shales, but in small fragments shales are here succeeded by a mass of white granitic sands and gravels, the upperSands -with siUcifled wood. parts of which are of doubtful age, forming indeed the passage into^^ ^ ? the Arrialoor group ; and in these large logs of silicified wood are imbedded in a prostrate position, and quite untouched by the Teredo, a fragment of one of * The names of these fossils are quoted from Forbess Monograph. t This species occurs also abundantly at the base of the Arrialoor group near have not met with it in the Arrialoor beds of Trichinopoly. 118 -^ CRETACEOUS ROCKS OF S. INDIA. [PaRT II. § 1. them measuring 85 feet in length, and having been originally, as is evidenced by its 13. Loo of Silicified Wood near of three times that length, is repressnted in the accompanying figure, imbedded in thesesemi-consolidated sands, and exhibiting at one end the basis of its roots or branches, whichmeasured altogether 3 feet in diameter, and resembled those of a Dicotyledonous tree. Thestructure was by no means clear. Another trunk that I measured by pacmg was not less thanabout 60 feet long. The sands frequently exhibit an internal false-bedded structure in great perfection; thelayers having on the whole a predominant dip to the Eastward. These granitic sands and gravels Fossil beds North of Serda- with silicified w ood extend about a mile to the North of Serdamun-mungaium. galum, where their lower beds are intercalated with shales aiid limestone beds of undoubted Trichinopoly age, as evidenced by numerous fossils, such as Nauti-lus elegans, DOrb., A. Tamulicus* n. s., Slrombus (allied to but distinct from S. contortus,Forbes), Fimis excavatus* n. s., Ghemnitz
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