The Quarterly journal of the Geological Society of London . es and hornblende-schistsare interfoliated with the gneisses, which in many places are highlygarnetiferous. Thus it happens that deep-red garnets, often aninch in diameter, are thickly sprinkled among the gravels of theMukuburi River. Due north of Memba a heavy dark-greeneclogite is interbanded with the garnet-gneisses of the MuendaziValley. Tourmaline-granites and pegmatites belonging to thecoarse-grained later type are strongly developed around Memba,and in the town itself the post-otHce is built on an outcrop ofquartz-tourmaline ro
The Quarterly journal of the Geological Society of London . es and hornblende-schistsare interfoliated with the gneisses, which in many places are highlygarnetiferous. Thus it happens that deep-red garnets, often aninch in diameter, are thickly sprinkled among the gravels of theMukuburi River. Due north of Memba a heavy dark-greeneclogite is interbanded with the garnet-gneisses of the MuendaziValley. Tourmaline-granites and pegmatites belonging to thecoarse-grained later type are strongly developed around Memba,and in the town itself the post-otHce is built on an outcrop ofquartz-tourmaline rock. For allowing me to make use of hisnotes on the Memba district, I am indebted to my former col-league, Mr. D. Alexander Wray. 38 THE PRE-CAMBRIAN HOCKS OF MOZAMBIQUE, [vol. lxxi\\ tx. 55v S (b) The Ampwihi Crossing:. Almost clue west of Mozambique Island, at a distance of42 miles from the sea, the military road from Mosuril toXampula crosses the Ampwihi River, the chief tributary of theMonapo. Near the crossing (see figs. 4 & 5) a welcome diversion. from the monotony of biotite-gneiss is introduced by the appear-ance, in successive belts from north-west to south-east, of horn-blende-gneiss, amphibolite, crystalline limestone, amphibolite,pyroxene-granite, and hornblende-gneiss, the whole series beingpenetrated by numerous dykes of graphic granite and by one ortwo coarse-grained dvkes that carry large crystals of magnetite V- 9i gs be SSI9U£) -9111019 SS19UQ ?9pu9[qujo^ m SX- ? >\: o* KS « ft 911UHJQ DiqdUJQ +.V »* 9JlUt?J£) -ajiSny 91iUejr) DiqdHjr) 9iqoqiqduiy 9[qii3p\[ 91IJ91SJO j[ 94i[oqiqdLuy SSI9UQ -9pu9jqujop| SSI9U£) -9iiioig * + +• + +% tttte m Wf- • •• .•* • ;«;*•; S$H and Llmenite. The hornblende-gneisses and pyroxene-graniteenclose small pockets of caleite,and near the boundaries of thecrystalline limestone many in-teresting contact-minerals aredeveloped. The hornblende-gneisses pass imperceptibly intothe surrounding biotite-gneissand are
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
