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| Keywords: The Quarterly journal of the Geological Society of London (13365010895).jpg 1849 <br> BROWN ON THE SYDNEY COAL-FIELD <br> 129 <br> a Starting from the base of the section the first erect tree is met <br> with in the bed of argillaceous shale No 51 222 feet above the mill- <br> stone grit It is a fluted Sigillaria 15 inches in diameter and 3 feet <br> high ; the base spreads out over the two-inch coal No 50 but no <br> roots are visible The interior of the stem is filled with argillaceous <br> shale See Fig 5 <br> h In the next superior bed of argillaceous underclay two upright <br> stems of Sigillariae occur only 4 feet apart; one is 18 inches and <br> the other 27 inches in diameter at the top their height being 4 feet <br> The stems are fluted and covered with a bark of coal three-fourths of <br> an inch thick They enlarge considerably as they descend but no <br> roots are visible We have here conclusive evidence that a slow and <br> gentle subsidence of the coal-measures was in progress during their <br> Fig 5 <br> accumulation ; the two-inch coal No 50 at one period the surface on <br> which the first tree grew having subsided a depth of eight feet the <br> shallow water was filled up with mud until it reached the surface on <br> which the two trees in the underclay No 52 flourished <br> c At the height of 147 feet above the last trees and 21 above the <br> Indian Cove Seam two large stems of fluted Sigillarise with a coaly <br> bark half an inch thick occur ; their length is 5 feet and their dia- <br> Fig 6 <br> meter at the top 24 inches which increases rapidly as they descend <br> but no traces of roots can be seen owing to the soft carbonaceous <br> shale which underlies them having fallen away from beneath <br> d About eight feet higher in the section several erect Calamites <br> from 4 to 8 feet in length and 3 to 5 inches in diameter occur in the <br> micaceous sandstone No 88 They do not present any traces of <br> roots <br> e Erect Calamites varying from 3 to 8 feet in height and about <br> 5 inches in diameter are also met with in the bed of arenaceous <br> shale No 119 being 151 feet above the sandstone No 88 last men- <br> tioned No roots are observable 36933954 113689 51125 Page 129 Text v 6 http //www biodiversitylibrary org/page/36933954 1850 Geological Society of London NameFound Calamites NameConfirmed Calamites EOLID 13132177 NameBankID 4098476 NameFound Sigillaria NameConfirmed Sigillaria EOLID 13132168 NameBankID 4343184 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36933954 dc identifier http //biodiversitylibrary org/page/36933954 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13365010895 2015-08-26 11 58 15 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1850 Photos uploaded from Flickr by Fæ using a script | ||||
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