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| Keywords: The Quarterly journal of the Geological Society of London (13206182474).jpg 274 PROCEEDINGS OF THE GEOLOGICAL SOCIETY April 14 <br> where expand into dense conformable masses nor form amygdaloids <br> nor trap tuffs Hence they are easily overlooked in a cursory sur- <br> vey although in reality very numerous and often persistent for great <br> distances <br> On the Geological Age of the Coal-Fields of Eastern Virginia as <br> determined by Fossil Remains <br> I shall now consider the chronological relation of the coal-field in <br> determining which we have no direct evidence from superposition <br> The only other strata occupying a similar position in the hypogene <br> region on the Atlantic Slope with the exception of some of a similar <br> character near Raleigh in North Carolina are those commonly called <br> the new red sandstone of Massachussets Connecticut and New Jer- <br> sey In part of New Jersey the strata of that red sandstone are un- <br> conformable to a part of the palseozoic series of the Appalachian <br> system and are therefore subsequent in origin to the movements <br> which gave to the old carboniferous and other still more ancient <br> groups of the Alleghany mountains their present strike dip and <br> flexures The red sandstone therefore being posterior in date to the <br> Appalachian coal strata the next question is whether the coal-field <br> near Richmond is of the same age as the red sandstone or of newer or <br> older date The difficulty of replying to the inquiry consists in this <br> that most of the fossils of the so-called new red sandstone are fish or <br> the foot-tracks of birds without any plants while those of the coal <br> near Richmond are almost exclusively confined to plants so that we <br> have scarcely as yet any satisfactory terms of comparison in the same <br> family of organic beings common to the two Before alluding to the <br> plants I shall say something of the small number of shells and <br> ichthyolites which I met with in the coal-field near Richmond <br> Shells of the Coal-Field <br> Fig 6 <br> In the carbonaceous shales associated with the main seam and <br> usually not far above a great number of minute flattened bivalves are <br> often observed in some places as at Harden' s pits north of Black- <br> heath see « fig 6 They resemble Cyclas in outline ; they are thin <br> and compressed have a horny texture oval and inequilateral with a 36933013 113687 51125 Page 274 Text v 3 http //www biodiversitylibrary org/page/36933013 1847 Geological Society of London NameFound Cyclas NameConfirmed Cyclas EOLID 13750058 NameBankID 4131942 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36933013 dc identifier http //biodiversitylibrary org/page/36933013 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-17 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13206182474 2015-08-26 12 54 23 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1847 Photos uploaded from Flickr by Fæ using a script | ||||
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