Rocks and Their Origins
Originally published during the early part of the twentieth century, the Cambridge Manuals of Science and Literature were designed to provide concise introductions to a broad range of topics. They were written by experts for the general reader and combined a comprehensive approach to knowledge with an emphasis on accessibility. This volume contains the 1922 second edition of Grenville A. J. Cole's Rocks and their Origins, first published in 1912. Intended for non-specialists, the book offers six concise chapters on various rock types, their characteristics, and their formation.
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Clays Shales and Slates
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accumulate acid aluminium amphiboles aragonite areas arise bands basaltic batholites become beds blocks boulder-clay calcareous calcite calcium carbonate Carboniferous cauldrons cemented Chalk chemical classiﬁcation clay cleavage coarsely coarser compact composition conglomerates consolidated constituents coral-reefs corals crust crystalline crystals decay denudation deposits detrital diorites dolomite dolomitisation dykes felspar ﬁeld ﬁne ﬁne-grained ﬁrst ﬂanks ﬂint ﬂoods ﬂow foliation fossils gabbro Geol geological glauconite gneiss grains granite granular Harker hollows hornblende igneous masses igneous rocks inﬂuence intrusive iron land lava-ﬂow lavas layers lime limestone magma magnesium carbonate marine massive material metamorphic metamorphic rocks mica mica-schist microscope minerals modiﬁed occur ordinary organisms origin particles pebbles planes pressure produced pyrites Pyroxenes quartz quartzite radiolaria reefs regions residual rounded sand sandstone scenery schists sedimentary sediments shales shells shore silicates siliciﬁed slate sodium soil speciﬁc gravity stones strata stratiﬁcation structure suﬂicient sulphate surface taluses tion types volcanic weathering