File:The Quarterly journal of the Geological Society of London (1918) (14596597237).jpg

Identifier: quarterlyjourna741918geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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nd Muscovite-Granites. (2) Graphic Granite and other Quartz-Felspar Bocks. (3) Pegmatites with Special Minerals. (4) Quartz-Veins, VIII. The Pyroxenite- and Picrite-Dykes 80 IX. Heavy Besidues from Crushed Bocks and Biver-Deposits ... 82X. Correlation of the Gneisses and Granulitic Granites of Mozambique 84 (1) Correlation of the Gneissose Granites. (2) Correlation of the Granulitic Granites. XL The Origin of the Inselberg Landscape 89 Faults and Joints.XII. Summary 94 I. General Description of the Area. Beyond the coastal and volcanic belts of Mozambique—alreadydescribed in a previous contribution J—the country assumes the 1 A. Holmes. The Tertiary Volcanic Bocks of Mozambique Q. J. G. S.vol. lxxii (1916-17) pp. 222-79. In this paper a brief account of the explora-tion of Mozambique was given, together with a bibliography and other pre-liminary matters. A further introduction to the subject-matter of the presentcontribution is considered, therefore, to be unnecessary. $2 53 ^fr ^
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4^ C3 2 n part 1) THE PRE-CAMBKIAX ROCKS OF MOZAMBIQUE. 33 form of a gently undulating plateau that gradually rises towardsthe west. As one proceeds inland its surface becomes increas-ingly diversified by inselberge and clusters of abrupt hills until,west of Ribawe, where the plateau reaches an elevation of nearly2000 feet, the scenery becomes more typically of a highlandcharacter and the stretches of unbroken plateau less extensive.Throughout the whole area traversed by the staff of the MembaMinerals Ltd. (after the Cretaceous and Tertiary formations hadbeen left behind) no rocks were found that were not of igneousor metamorphic origin, or that, like laterite,1 could not be tracedimmediately back to an igneous or metamorphic parent-rockor to solutions percolating through such rocks. (See index-map,fig. 1, p. 32.) The dominant rock of the country, persistent toa degree that often becomes monotonous, is a grey biotite-gneiss.Interfoliated with, the gneiss are occasional lenticular mass

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