The Quarterly journal of the Geological Society of London . several larger crystals of felspar, some showingplagioclastic twinning. All exhibit a rather rounded central part speckled withcjpacite, surrounded by a clearer margin, which has a more rectilinear slide from a compact-looking fragment, collected from the S. side, muchresembles in general character the rock of the pmqjle porphyritic fragments atE-atchet Hill, &c., though the quartzes and felspars are smaller, and its ground-mass puts on occasionally the slightly granular aspect characteristic of theordinary Peldar rock. Now
The Quarterly journal of the Geological Society of London . several larger crystals of felspar, some showingplagioclastic twinning. All exhibit a rather rounded central part speckled withcjpacite, surrounded by a clearer margin, which has a more rectilinear slide from a compact-looking fragment, collected from the S. side, muchresembles in general character the rock of the pmqjle porphyritic fragments atE-atchet Hill, &c., though the quartzes and felspars are smaller, and its ground-mass puts on occasionally the slightly granular aspect characteristic of theordinary Peldar rock. Now and then these granules give indications ofspherulitic structure. There is a nest of small felspar crystals and epidote (?)yan inclusion from a yet older rock. IToface p. 80. lr= MAP OF THE AREAS OF SHARPLEY AND PELDAR TOR IN CHARNWOOD FOREST Sharpley rock I VISIBLC I Inferrco Peloar rock) VisibleInferrcoAsh •» AcoLOMERATC Ea^ Visible at- Purple Pobphyritic ^> Purple i1^.. porcellanous^..SyenitoioSlate FragmentsIncluded. _j * FURVONCSI Q. J. G. S. vol. ilvii.] EXPLANATION OF THE MAP. This Map, traced from the Ordnance Survey on the six-inch scale,shows the areas in which the porphyroids of Sharpley and of PeldarTor are exposed, and the regions beneath which they probably latter are obtained approximately by connecting together theoutermost outcrops of each tj-pe of rook with straight lines, so as todefine an area within which no other rock is visible. The Map alsomarks the outcrops of other rooks surrounding the above-namedareas, and indicates their nature in each case. No attempt hasbeen made to give an accurate representation of the outlines of thevisible rock-masses. The place has been determined by the indica-tions on tlie Map, and the outline sketched in from memory; more-over, in some cases a number of separated outcrops, which are inproximity one to another, are represented as if they formed, as nodoubt they do, a continuou
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
