Memoirs of the Geological Survey of India . ^^?, ^iif aeli HJ.,FrazerUtli: Chap. IV. 1.] METAMORPiriC UOCKS. 81 former place. Seen from the east or west sides, this splendid tor has arudely j)yramidal shape, but when looked at from the north or south, itrises up like a fine tall tower, and may be seen 3 or 4 miles off standingup boldly from the surrounding jungle. In height it cannot be less than50 or 55 feet. The lower sketch shows it as seen from the north fourth sketch (Fig. 4) represents another fine tor perched on thetop of a hillock hing between the village of Tirppeir and
Memoirs of the Geological Survey of India . ^^?, ^iif aeli HJ.,FrazerUtli: Chap. IV. 1.] METAMORPiriC UOCKS. 81 former place. Seen from the east or west sides, this splendid tor has arudely j)yramidal shape, but when looked at from the north or south, itrises up like a fine tall tower, and may be seen 3 or 4 miles off standingup boldly from the surrounding jungle. In height it cannot be less than50 or 55 feet. The lower sketch shows it as seen from the north fourth sketch (Fig. 4) represents another fine tor perched on thetop of a hillock hing between the village of Tirppeir and the Yeddacul FlO. 4.—TOU OF GRANITOID GNEISS NEAR rock, before alluded to. The uppermost block is probably about 12 feethigh, and appears to stand on a base so small as to suggest its beingin an extremely unsafe position. Many of the tors around tliehillock evidently owe their origin to the preva-lence of a great north and south system of joints,and that figured seems also due to fissures of jointing. As seen from belowL ( -303 ) Jointing. 82 GEOLOGY or TRTCIITxVOPOLYj &C, [ClIAP. IV. 1. (for a profusion of thorny shrubs rendered the hillock inaccessible whenvisited in 1861) the illuminated face of the tor appeared to coincide withthe north-south system of joint planes. In the Mallayanur tor this was unequivocally the case; indeed,the north and south system of joints is strongly developed in many partsof the granitoid gneiss region. Of very common occmrence in this series of rocks are little veins and strings, and sometimes incrustations of a brightEpidote. ^ \ _ _ * green mineral^ apparently Pistacite, a variety ofEpidote. The
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