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| Keywords: The Quarterly journal of the Geological Society of London (13206023454).jpg ROBERTSON ON THE WEALDEN BEDS OF BRORA 113 <br> posterior portion of eacii volution between the ends of the ribs and <br> the suture Aperture oblong-ovate both lips smooth canal modeft <br> rately long and curved to the right Length '55 inch breadth <br> ¢15 inch jHrst volution 25 inch angle of spire 30° <br> Mitra juniperus Strickland ” Taper with ten or <br> eleven slightly rounded volutions On each volution <br> are from twenty to twenty-two slender rounded tole- <br> rably regular longitudinal ribs becoming evanescent <br> towards the suture which is distinctly marked by a <br> fine line The intervals between the ribs are in <br> general slightly wider than the ribs themselves and <br> are shallow flattish and furnished with fine irregular <br> longitudinal wrinkles especially on the first volution <br> Both ribs and intervals are crossed by nine or ten fine <br> thread-like striae producing a reticulated surface ; two Mitra juniperus <br> of these are at the posterior part of the volution near <br> the suture ; in front of these is a smooth zone equal to about one- <br> fifth of the exposed part of the volution which is destitute of striae ; <br> the remaining striae are at the anterior portion of the volution The <br> anterior portion of the first volution has in addition about twenty <br> more striations regular and closely compacted which are concealed <br> by the succeeding volution Aperture narrow ; columella with three <br> strong rounded spiral folds the hindermost largest the anterior one <br> slight their intervals broad flat and smooth ; between the two ante- <br> rior ones is a slight trace of another The medial portion of the <br> outer lip is occupied interiorly by eleven or twelve raised thread- <br> like lines which penetrate into the mouth as far as can be seen <br> Length about 1 6 inch breadth '45 inch first volution '6 inch <br> angle of spire 1 8° <br> On the Wealden Beds of Brora Sutherlandshire with Re- <br> marks on the Relations of the Wealden Strata and Stonesjield <br> Slate to the rest of the Jurassic System and on the marine con- <br> temporary of the Wealden Series above the Portland Stone By <br> Alexander Robertson Esq F G S <br> Read May 20 1846 <br> In the spring of 1843 I had the honour of transmitting to the <br> Society a short account of two beds containing freshwater fossils <br> which were found by me during the preceding summer intercalated <br> with the carboniferous portion of the Jurassic series of Brora <br> Having been prevented at the time of the discovery from making so <br> detailed an examination of their relation to the rocks with which <br> they were associated as was desirable I again visited the locality and <br> now present the result of my observations on that occasion <br> My first object was to determine the exact age of the marine <br> bed immediately above the main seam of coal and with this view I <br> Proc Geol Soc vol iv p 173 <br> Vol Ill part i i 36932842 113687 51125 Page 113 Text v 3 http //www biodiversitylibrary org/page/36932842 1847 Geological Society of London NameFound Mitra juniperus Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36932842 dc identifier http //biodiversitylibrary org/page/36932842 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 N02/13206023454 2015-08-26 12 50 52 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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