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| Keywords: The Quarterly journal of the Geological Society of London (12645685304).jpg 342 PROCEEDINGS OF THE GEOLOGICAL SOCIETY Feb 21 <br> Fig 2 <br> Section from Gay Head to Sancati <br> Island of Martha's Vineyard <br> Nantucket <br> a Tertiary clay <br> b Stratified drift sand and gravel <br> c Oyster-bank <br> d Stratified drift sand overlying the oyster-bank <br> cliiied to consider the tertiary itself as deposited by the same tidal <br> agency being formed from the detritus of the greensand of New <br> Jersey ; a supposition which seems the more probable as it would <br> account for the great similarity of materials between the greensand of <br> New Jersey and the tertiary of Long Island a similarity which is so <br> striking that it led even Mr Mather to consider this tertiary as iden- <br> tical with the greensand <br> Concerning the drift overlying the tertiary clay at Sancati it is <br> obvious from the regularity of the strata and from the very perfect <br> state of preservation of the shells imbedded in it that it has not un- <br> dergone any violent disturbance since their deposition The species <br> collected by us in the above-mentioned oyster-bank are the following <br> Venus mercenaria plenty <br> Mya arenaria plenty <br> Buccinum undatum rather rare <br> – plicosum abundant <br> Ostrea borealis a bed several feet thick Nassa obsoleta abundant <br> trivittata abundant <br> Scalaria groenlandica rare <br> Balanus rugosus very abundant <br> Serpula forming a layer several feet thick <br> Pagurus pallicaris claws <br> Area transversa very abundant <br> Solen ensis abundant but very brittle <br> As t arte Cartanea rather rare <br> Cardita borealis rare <br> Cumingia tellinoides rather rare <br> Crepidtda fornicata abundant <br> Now these are without any exception the same species that are <br> found living on the shore of Nantucket and Cape Cod and as they <br> are all in their natural position the bivalves having almost always <br> the two valves united and the Venus being commonly half open just <br> as they are found on the beaches when the muscles have relaxed after <br> death we may fairly infer that in this part of the continent at least <br> the climate has not undergone any considerable change since the <br> deposition of these fossils <br> The presence of a stratum of disintegrated shells of the same <br> species resting upon the undisturbed oyster-bank may easily be <br> accounted for by a somewhat more violent action of the tides which <br> deposited in this irregular manner a part of the shells which were <br> washed off from the oyster-bank itself in the same way as is the <br> case now among the Nantucket shoals Indeed there is to be found <br> on the slopes of every shoal ridge a region from which the dredge <br> brings up nothing but loose and broken shells This region is so <br> characteristic and so constant that one of us has designated it in his <br> ' Report on the Distribution of Animals among the Shoals under a <br> peculiar name as the Recjion of Broken Shells According to Capt <br> See Proceedings of the Boston Natural History Society 35268992 109512 51125 Page 342 Text v 5 http //www biodiversitylibrary org/page/35268992 1849 Geological Society of London NameFound Balanus rugosus NameConfirmed Calanus ramosus Mori 1929 NameFound Buccinum undatum NameConfirmed Buccinum undatum EOLID 595071 NameBankID 2685555 NameFound Cardita borealis NameConfirmed Cardita borealis EOLID 449193 NameBankID 511393 NameFound Crepidtda fornicata NameConfirmed Crepidida fornicata NameFound Cumingia tellinoides NameConfirmed Cumingia tellinoides EOLID 492835 NameBankID 2693530 NameFound Mya arenaria NameConfirmed Mya arenaria EOLID 492903 NameBankID 2693820 NameFound Nassa obsoleta NameConfirmed Nassa obsoleta Say 1822 EOLID 485262 NameBankID 639072 NameFound Ostrea borealis NameConfirmed Ostrea borealis Lamarck 1819 NameFound Pagurus NameConfirmed Pagurus EOLID 10948155 NameBankID 2706941 NameFound Scalaria groenlandica NameConfirmed Scalaria groenlandica Möller 1842 NameFound Serpula NameConfirmed Serpula EOLID 16660 NameBankID 238476 NameFound Solen ensis NameConfirmed Solen ensis NameFound Venus mercenaria NameConfirmed Venus mercenaria Linnaeus 1758 EOLID 492162 NameBankID 638069 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35268992 dc identifier http //biodiversitylibrary org/page/35268992 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645685304 2015-08-27 10 56 48 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script | ||||
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