Explanatory Memoir to Accompany Sheets 104 and 113 with the Adjoining Portions of Sheets 103 and 122 (Kilkieran and Aran Sheets); Of the Geological Survey of Ireland, Illustrating a Portion of the County of Galway

Explanatory Memoir to Accompany Sheets 104 and 113 with the Adjoining Portions of Sheets 103 and 122 (Kilkieran and Aran Sheets); Of the Geological Survey of Ireland, Illustrating a Portion of the County of Galway

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 edition. Excerpt: ...to draw a line so as to exclude all pieces of the metamorphic sedimentary rocks. This irregularity apparently is due to Intrusive granite breaking up in the vicinity of the boundary, and sending veins in all directions, but more especially into the adjoining metamorphic sedimentary rocks." On Croghnut, the island a little east of Illaungorm south, there is also some granite, forming the stack or rick-bike peak in the centre of the island, and extending in a rib to the northward. This to the north is a hornblendic granite of the Galway type, while to the south, forming the summit, it partakes of the nature of the coarse hornblendic gneiss or foliated porphyritic granite. Bounding this foliated granite on the south-west and northeast, are green dyke-like masses, full of quartz strings, that if continued would join a little east of the east shore. These apparently are wild lodes, more especially as to the southward in their strike on the mainland, a similar dyke-like mass was observed cutting across the gneiss and schist. The other rocks on this island are hornblendic gneiss and schist, and very coarse gneiss, with near the S. W. point a bed of fine hornblendic rock, schistose in places; the rocks in the last-mentioned place dip eastward at from 30 to 50, while at the north-east of the island they are dipping S.E., N.E., and S., respectively, at 35, 20, and 60. Metamorphic rock country, east and south-east of Bertragliboy bay.--On the mainland, from a mile to two miles S.S.W. of Croghnut, in the neighbourhood of Lough Clugacomeen, the metamorphic rocks are very much broken up by faults and veins of granite, with other intrusive rocks. In the creek leading to Glinsk-bridge, and from that inland for some distance towards the southward, ...show more

Product details

  • Paperback
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123657088X
  • 9781236570888