Records of the Geological Survey of India Volume 27-28 - Tapa blanda

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...with corundum. Foliation of the above varieties seems to be genuine, consisting of (1) layers of different width, often contorted, composed of different minerals, and combinations of minerals, (2) layers of different degrees of coarseness of grain. The rocks are not as a rule fissile to any extent along the foliation. Intrusive rocks--(A). Purple granites are non-foliated massire rocks, occurring sparsely and are in truded along foliation of gneissic rocks. They often include large pieces of hornblendic rocks. (B). Dark traps, doleritic, composition augite and plagioclase, non-foliated, toogh, massire dyke rocks, crossing the foliation of the gneissic rocks at right angles; fairly numerous, but difficult to trace far, except locally. It was desirable to study the cretaceous beds of Pondicherry in greater detail, The cretaceous rockt ana" collect therefrom good material for description; Dr. of Pondicherry; Dr. H. Warth was deputed to do so, and he devoted the field-season Warth. of 1893-94 to this task. The fossils which were collected by Dr. Warth are somewhat dissappointing, both as regards numbers and preservation, but they have been sent to Dr. Kossmat of the Vienna University, who is also engaged on the determination of the collection of cretaceous fossils from Trichinopoly belonging to the Madras Museum. From a preliminary note which this gentleman has sent it appears that the entire series of Pondicherry beds belongs to the Ariyalur group of Southern India. It will be remembered that a landslip occurred early in September 1893 and dammed up the Birahi Ganga which drained 90 square Mr T'HHoiland. miles above Gohna. The locality was examined by Mr. Holland early in March 1894, when the lake was nearly 3 miles long with a maximum width of 1 mile. Mr...