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| Keywords: The Quarterly journal of the Geological Society of London (13960021713).jpg ROCKS OF THE LEICESTEKSHIRE COAL-FIELD 21 <br> in contact with the Main Coal whilst at Boothorpe we know they <br> overlie strata belonging to a very much higher horizon in the Coal- <br> measures <br> 2 LlTHOLOGICAL CHARACTERS OF THE BEDS <br> Throughout the whole of the district we are describing the Per- <br> mian beds maintain certain well-marked lithological characters <br> which apart from any consideration as to the stratigraphical position <br> of the series are sufficient to differentiate them with certainty from <br> both the Trias and the Carboniferous At their outcrop they gener- <br> ally yield a subsoil of deep red or purple clay sometimes sandy and <br> containing more or less of brecciated fragments When observed <br> in freshly cut sections such as those described above pp 6 8 as <br> occurring at Swadlincote and the Boothorpe Clay Works it is seen <br> that the red and purple clays which are associated as a rule with <br> thin white sandy bands and several beds of breccia occur at the base <br> of the series The red clays are much more purple in colour and more <br> homogeneous in character than the marls of the Lower Keuper and <br> are of a decidedly different shade of colour from the marls of the <br> Upper Keuper The Permian marls with their breccias are at <br> Swadlincote followed upwards by a few feet of evenly bedded fine- <br> grained sandstones which are fissile and often beautifully ripple- <br> marked These sandstones are of a light buff colour as a rule very <br> soft and contain numerous specks of a blackish mineral They are <br> very unlike the saudstones found on any other geological horizon in <br> the district <br> The principal interest however centres in the brecciated bands <br> which it will be seen have yielded a large amount of information <br> throwing light upon the physical changes attending the deposition <br> of the whole series <br> The brecciated bands are rarely more than 3 feet in thickness and <br> contain fragments of a great variety of rock all comparatively little <br> water-worn and varying in size from that of a pea to 5 or 6 inches <br> across Occasionally still larger fragments occur; bat as a rule <br> they do not measure more than 1 to 2 inches along their greatest <br> dimensions <br> These angular pieces of rock are imbedded in a bluish-grey matrix <br> of calcareous sand which varies very much in hardness Sometimes <br> as at Measham and Oakthorpe it forms with the enclosed fragments <br> a rock of a considerable degree of hardness whilst at other places <br> as jNewhall Park Colliery Swadlincote c it is only in part con- <br> solidated and readily breaks down under the action of the weather <br> The red marly soil at the outcrop of the Permians is of a very rich and <br> fertile character and affords in this respect a great contrast to the very light <br> sandy and pebbly soil of the Bunter and to the cold heavy soil of the under- <br> lying Coal-measure clays The Permian marls are in some localities used <br> for dressing the sandy soils of the Bunter which are so light as occasionally <br> to be completely denuded by the action of the wind 36939760 113696 51125 Page 19 Text 45 http //www biodiversitylibrary org/page/36939760 1889 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36939760 dc identifier http //biodiversitylibrary org/page/36939760 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13960021713 2015-08-26 06 51 51 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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