The book The Geology of the Goldfields of British Guiana was written by author John Burchmore Harrison Here you can read free online of The Geology of the Goldfields of British Guiana book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Geology of the Goldfields of British Guiana a good or bad book?
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The dark-coloured hornblende-schist contains many thin veins of quartz with grains of arsenical pyrites. In places narrow bands of amphibolite are seen with but little foliation, while here and there narrow, lighter- coloured bands of schist occur. Through the hornblende-schist and the amphibolite many intrusive tongues of pinkish granitite and of white muscovite-granite are noticeable. At the head of the cataracts are exposures of epidote-granitite-gneiss, followed by a narrow belt of hornblen...de-schist. The fact that the granitite of the district is more recent than the hornblende-schist and gneiss is very clearly shown at these cataracts. From Tupeku Cataracts to Makari Rapids the country is agne&sose one. The gneiss is well seen near Poke Island and at Mary Rapids, while in the channel above these rapids a narrow tongue of quartz- mica-diorite traverses it. At and above Itaballi Rapids the gneiss exposed is very contorted, and consists of bands of light-coloured granitite-gneiss with dark, almost black, glistening ones of diorite- gneiss.
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