Memoirs of the Geological Survey of India . sometimes conglomerates containing clay-nodules from the Ootatoor this they assume the form of fine sandy silts, and these continue up to the point where,in a little nullah, I found them resting on the Ootatoor beds, which exactly resembled them P 114 CRETACEOUS ROCKS OF S. INDIA. [pART II. § 1. lithologicalljs except that in the latter AVere intercalated thin plates of Gypsum which wereabsent in the former. This explanation once clearly established, was of much importance, asImportance of the indicai ion it proved how unreliable is the m
Memoirs of the Geological Survey of India . sometimes conglomerates containing clay-nodules from the Ootatoor this they assume the form of fine sandy silts, and these continue up to the point where,in a little nullah, I found them resting on the Ootatoor beds, which exactly resembled them P 114 CRETACEOUS ROCKS OF S. INDIA. [pART II. § 1. lithologicalljs except that in the latter AVere intercalated thin plates of Gypsum which wereabsent in the former. This explanation once clearly established, was of much importance, asImportance of the indicai ion it proved how unreliable is the most regular and persistent apparentDiereby afforded. stratification in these beds, and gave me a clue which proved of much service in elucidating similar anomalies in the mass of the group to the Eastward. Thesection will be rendered more clear by the accompanying diagram, which represents an imagi-naiy section across the Trichinopoly group, a little to the West of Paroovalapoor. Fig. 12. Sketch Section of the TKiCHiNoroLY Group. JL mile-. Beds East of Paroovalapoor. g. Gneiss; o. Ootatoor beds,- t. Trichinopoly the nvdlah to the East of Paroovalapoor, the Trichinopoly beds spread out inall dii-ections. To the South and East they fill a bay-shapeddepression in the gneiss, (4 miles across) and the same distancem depth; the beds resting on gneiss on the Western boundary and on the coral-limestone ofCullygoody to the Eastward, while their Southern exti-emity is concealed beneath the alluvialdeposits of the Cauvery vallej^, which lap roxmd the extremity of the Thutchuncoorchygranite ridge. The beds exposed between Paroovalapoor and Seeroovoyalore are sands and sandy shales, „ with conglomerate, omewhat irregularly stratified, but with a Beds around Thapaye. o > o j o ?? general low dip to the North-east, or away from the gneiss. South of this village little is seen of the lowest beds, owing to the increasiag thickness of the super-ficial alluvium : the ?\dllage
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