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| Keywords: The Quarterly journal of the Geological Society of London (13860046263).jpg 582 <br> PKOE C LAPWOKTH ON THE GIKVAN SUCCESSION <br> s w <br> Crazqhead MM- <br> Fig 13 � Section of Craighead Quarries <br> N E <br> ' West Quarry <br> £ojC Quarry <br> Stinchar Limestone Group <br> Ab 4 Didymograp tus-z me � <br> c Shivery shales with Encrinurus Ampyx Leptana c <br> b Blue calcareous and slightly carbonaceous shales with Climacograptus <br> bicornis Diplogr rugosas c <br> a Nodular and highly calcareous shales crowded with fossils <br> Ab 3 Compact Limestones fossils rare <br> Ab 2 Impure flaggy and nodular limestones greatly shattered and folded with <br> rare Maclurea Logani and abundant corals <br> Ab Sandy and flaggy limestones with Orthis Leptcsna c <br> Kirkland Conglomerate <br> Aa Basal brecciated and calcareous conglomerate and grit <br> x Igneous and altered rocks of Craighead Hill <br> Car Lower Carboniferous sandstones of the Girvan valley <br> // Faults <br> The floor of the quarry itself and the little cliff supporting the <br> roadway to the south is composed of the purer and more compact <br> limestones which give the quarry its economic value They are <br> here greatly hardened and have a pale greyish-white tint when <br> freshly broken They contain a larger proportion of carbonate <br> of lime than elsewhere and seem to have been quarried in thick <br> and heavy masses A few of the same fossils are procurable from <br> them as those found in the muddier beds below but they are much <br> more difficult of extraction <br> The terminal beds of these compact limestones are seen at the <br> foot of a boss of unexcavated rock which at present divides the two <br> quarries from each other This boss owes its existence to the cir- <br> cumstance that the strata of which it is formed contain too little <br> lime to be available for burning ; and they have been allowed to <br> remain while the surrounding limestones have been quarried away <br> The strata seen in this boss are however of great value to the <br> stratigraphist as they enable him to complete the entire section of <br> the calcareous series visible at this locality <br> In the western cliff of this mound the Compact Limestones are <br> seen to be overlain by about 10 feet of grey and black Graptolitic <br> shales identical in mineralogical character with the Didymograptus- <br> shales Ab 4 of the Auchensoul band They contain a few Graptolites <br> and shells Of the former Mrs Gray has here collected Crypto - <br> graptus tricornis Carr sp and Diplograptus foliaceus Murch <br> In the grass-grown flank of the boss on its south-west aspect <br> these Graptolitic shales pass upwards into an equal thickness of hard 36936411 113692 51125 Page 582 Text 38 http //www biodiversitylibrary org/page/36936411 1882 Geological Society of London NameFound Ampyx NameConfirmed Ampyx EOLID 4320587 NameBankID 2875646 NameFound Climacograptus bicornis NameConfirmed Climacograptus bicornis NameBankID 5675334 NameFound Didymograptus NameConfirmed Didymograptus EOLID 4724756 NameBankID 4143122 NameFound Diplograptus foliaceus NameConfirmed Diplograptus foliaceus NameBankID 6575092 NameFound Encrinurus NameConfirmed Encrinurus EOLID 4322767 NameBankID 2875682 NameFound Graptolites NameConfirmed Graptolites NameBankID 423327 NameFound Maclurea NameConfirmed Maclurea NameBankID 4228756 NameFound Orthis NameConfirmed Orthis EOLID 4333134 NameBankID 4270859 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 38 1882 Geology Periodicals Smithsonian Libraries bhl page 36936411 dc identifier http //biodiversitylibrary org/page/36936411 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-15 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13860046263 2015-08-26 07 51 58 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1882 Photos uploaded from Flickr by Fæ using a script | ||||
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