. The geology of the goldfields of British Guiana. ance of about six miles, a district ofgrey hornblende-granitite. Above this belt of granitite, as far asMonossi, the country is one of more or less foliated porphyriteand of schists derived from it. In places, as near Gorings Landing,low hills of red laterite indicate where bands of more basic rocksoccur. A narrow belt of grey granitite crosses the river near MonossiCreek. From this to a little beyond Mazawini Landing schistoseporphyrites again occur, The strike of the foliation of the schistsfrom Mazawini to Kaikushie varies from the north-ea
. The geology of the goldfields of British Guiana. ance of about six miles, a district ofgrey hornblende-granitite. Above this belt of granitite, as far asMonossi, the country is one of more or less foliated porphyriteand of schists derived from it. In places, as near Gorings Landing,low hills of red laterite indicate where bands of more basic rocksoccur. A narrow belt of grey granitite crosses the river near MonossiCreek. From this to a little beyond Mazawini Landing schistoseporphyrites again occur, The strike of the foliation of the schistsfrom Mazawini to Kaikushie varies from the north-east and south-westto east and west, while the general strike below Agawaris Creek isnorth north-west and south south-east. In many places the schists aretraversed by veins and reefs of quartz-rock and of quartz-schist, which,as a rule, are not auriferous. Mazawini Landing is situated on a hill ofred laterite. This is probably the decomposition-product of an quartz-gravel in the laterite is auriferous. To face )„ujc 111.] Tlatk T OWA KAIMA FALLS (oYIvU GKAMTITK G>MaSs), BARAMA RIVER, NORTH-WEST DISTRICT. P)wi(, h;i 11. T. Perkim. Descriplive Geolixjij. Ill From about half a mile above Mazawini Landing the river flowsthrough a district of gneissose granitite and gneiss. The rocks for aboutfdur to live miles are mainly grey gneissose granitite. Above this thecountry consists of a fine-grained grey epidote-granitite-gneiss, which istraversed at the Towakaima and at the Mazawini Cataracts by veins andnarrow belts of grey and pink granitite and of diorite. In placesin this part of the district masses of amphibijlite occur in the gneissosecomplex, and these may have given rise to the hills of red laterite whichare not unfrequent. The reaches of the Barama River above Towakaima Cataracts, as faras they have been examined geologically, traverse a country of more orless schistose porphyrite intersected by belts of hornblende-schist. The Waini River.—There are so
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