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| Keywords: The Quarterly journal of the Geological Society of London (12511897835).jpg NELSON ON THE BAHAMAS <br> 207 <br> Fig 2 Vertical section of jEolian rock from Mr Burnside's <br> Quarry Nassau New Providence Extreme height about 70 feet <br> Fig 3 Horizontal sec- <br> tion of j3 olian rock <br> About 18 feet long <br> The largest and most instructive section <br> in the Bahamas of this calcareous sand- <br> stone is that in Mr Burnside's Quarry <br> at the end of the road in continuation of <br> Division Street Nassau across the hill <br> immediately under Fort Fincastle The <br> stone is the ordinary drip-stone of the <br> Bahamas and the structure is dome- <br> shaped presenting as usual in rocks of <br> olian origin very irregular saddles on <br> every vertical section See figs 2 3 <br> 4 Lithological Notices Ordinary <br> Rock Chalk Mud and Red Earth The <br> ordinary Bahama rock everywhere consists <br> of the above-mentioned calcareous sand- <br> stone It is somewhat similar to Port- <br> land Stone in appearance but softer and <br> more porous When first exposed it is <br> quite white and is inconveniently bright and dazzling under a <br> tropical sun ; but it becomes of a dark ashen grey colour along <br> the sea-coast and more or less so elsewhere when exposed to the <br> weather Its average weight like that of the Bermuda stone va- <br> ries from 95 to 145 pounds per cubic foot Its inferior value as a <br> building material arises from the numerous sand-flaws specimen <br> No 7 and consequent ready failure when exposed to the weather <br> About the south-west of New Providence for some feet above the <br> sea the rock is hard and homogeneous and may be raised in good <br> blocks for building purposes The looser and softer kinds of rock <br> are found usually on the hill tops A variety offering a singular <br> coimterfeit of true oolitic structure is found at or near White Cay <br> Exuma and elsewhere specimens 4 9 ; but the spherules are <br> solid and have been derived apparently from the stems of corallines <br> see above p 206 and specimens Nos 2 3 <br> remarks consist more of sand derived from shells than from corals ; whilst in the <br> Bahamas the reverse obtains The hills formed of these rocks in the Bahamas <br> do not exceed 230 feet in height in any instance ; in Bermuda they are not more <br> than 250 feet high ; in the islands of the Red Sea however they attain nearly <br> 300 feet as noticed by Ehrenberg In the Pacific Islands the accumulation and <br> consolidation of the olian deposits appear to have made but little progress 34983320 108767 51125 Page 207 Text v 9 http //www biodiversitylibrary org/page/34983320 1853 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 9 1853 Geology Periodicals Smithsonian Libraries bhl page 34983320 dc identifier http //biodiversitylibrary org/page/34983320 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-14 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12511897835 2015-08-27 09 56 24 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1853 Photos uploaded from Flickr by FĂŚ using a script | ||||
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