The Geology of the Goldfields of British Guiana

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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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