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| Keywords: The Quarterly journal of the Geological Society of London (13368854095).jpg 1873 <br> JTJDD ” THE SECONDARY ROCKS OF SCOTLAND <br> 143 <br> – a <br> rS ¢ <br> flhl <br> E <br> im <br> « <br> s <br> C <br> V <br> g <br> £ <br> E <br> H <br> '£ <br> 03 <br> a <br> 3 <br> CO ¢ <br> 03 <br> a <br> 4 <br> C <br> °2 <br> <br> Tab <br> a <br> o <br> CG ~ <br> o <br> o u B <br> clusively establish as I believe the Secondary- <br> age of the long-disputed beds fig 14 <br> The beds referred to are seen at Dunrobin <br> to underlie conformably a considerable thick- <br> ness of strata which I shall demonstrate by <br> most abundant palaeontological evidence to be <br> of the age of the Middle and Lower Lias <br> With these Mesozoic strata the formation in <br> question agrees both in strike and dip while <br> with the Old Red Sandstone strata which are <br> exhibited in close proximity it has no common <br> relations whatever Indeed the strata in <br> question appear to have been seen by Sir B I <br> Murchison though probably not under favour- <br> able conditions and were by him unhesitatingly <br> placed in the Secondary series <br> There are two objections which may pos- <br> sibly be urged against the view which I have <br> taken of the relations of this formation in <br> Sutherland <br> It may be said that the agreement in strike <br> and dip of the strata at Dunrobin may be ac- <br> cidental and that the Lias strata instead of <br> overlying the calcareous and cherty rock may <br> be faulted against it This objection may ap- <br> pear to receive some support from the facts <br> which I have already pointed out indicating <br> the greatly faulted condition of these Suther- <br> land rocks <br> To this objection there is fortunately the <br> most complete answer The lowest beds of <br> the Lias series as is so often the case consist <br> of a conglomerate ; and among the pebbles in <br> these beds are numerous fragments of the <br> peculiar calcareous and cherty rock so fre- <br> quently referred to <br> It may also be urged that possibly the con- <br> formity of the beds of the formation in ques- <br> tion with the overlying Lias strata may be <br> accidental and that in spite of it they may be <br> of as early date as the Old Eed Sandstone <br> In reply to this objection I would point to <br> the fact that in Golspie Burn the Cherty Bock <br> of Stotfield is seen at only a very short distance <br> from beds of undoubted Old Bed Sandstone <br> strata and that while the latter are greatly <br> disturbed and dip S E at an angle of 70° the <br> former dips N N E 12° conformably to the <br> great mass of Secondary strata here <br> The facts now adduced with regard to the <br> stratigraphical relations of the Cherty Bock <br> of Stotfield and the underlying sandstone <br> which we cannot hesitate to recognize as the 39051047 120601 51125 Page 143 Text v 29 http //www biodiversitylibrary org/page/39051047 1873 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 29 1873 Geology Periodicals Smithsonian Libraries bhl page 39051047 dc identifier http //biodiversitylibrary org/page/39051047 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13368854095 2015-08-26 10 53 47 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1873 Photos uploaded from Flickr by Fæ using a script | ||||
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