1 10 2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/2104f9a268fa0c07974391c7e5b42537.jpg 22683b5b280f6f7e52b127fa96a1c1b3 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0d1b0055e9ce25409830de31afcc15e7.jpg d8ddf286bf56cf0325e01f494e811bac https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f6f992805d2607a8fd41a0fc8b12aa41.jpg 5082c93831a75300cc00734390354bc0 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/40665952add448e60dd592fd440b8865.jpg 7b6d78f1fce43703a587baebadc97de2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/5d38ba3667c7dc71e02797f7fd019b47.jpg fa6341537d67035838ad15b76a87a4ec Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2><strong>L341<br /></strong></h2> <h2>Mudstone, calcareous</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Lower Carboniferous</p> <h3>Location</h3> <div class="element-text"> <p>Millstone Grit Series<br />Bowland, West Yorkshire</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Very dark grey to black mudstone.<span> </span><br />Faint, fine-scale laminations visible on cut surface.<span> </span><br />Not<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/196">fissile</a><span> </span>- does not readily split along bedding planes.<br />Contains fossils and fossil imprints.<span> </span><br />Some glinting flakes of mica.<span> </span><br />This rock fizzes gently with acid, indicating that it contains some carbonate.<span> </span><br />Weathered to light brown-grey in places.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text">Laminations are very clear when the thin-section is held up to the light. They are mainly planar, but some wrap around lighter regions in the rock.<br /><br />Under the microscope, the rock is brown, with fine dark brown streaks, laminated.<br />Mainly carbonate, some white mica, rare quartz.<br />Bioclasts, mainly along bedding surfaces, probably gastropods and bivalves. Some of the shells have been dissolved. The spaces left have been filled by secondary calcite.<br />Sparry carbonate cement.</div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Fine-grained, so formed in a very low energy environment.<span> </span><br />Shells are too large to have been swept in by such low energy currents, so the shells are in life position.<span> </span><br />If the shells are indeed gastropods and bivalves the rock could be marine or non-marine. The presence of brachiopods<span> </span><em>would</em><span> </span>indicate a marine environment.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">calcareous mudstone</div> </div> lamination low energy https://wserv3.esc.cam.ac.uk/p1acollections/files/original/ccd2e73c233ad6349b5c93414d58b231.jpg 62525c1eed532ca964421366771e92aa https://wserv3.esc.cam.ac.uk/p1acollections/files/original/2d5710f094a41112efe4a6ced6ef87ba.jpg 1c4dff891bd163644992404cd5efe88c https://wserv3.esc.cam.ac.uk/p1acollections/files/original/16246ed0fde11e3e222ba6d720f0af18.jpg 2a9a504b49d86b21cd7f29ccbce43c7d Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2><strong>L326<br /></strong></h2> <h2>Sandstone, ferruginous arenite</h2> Subject The topic of the resource <h3>Specimen Age</h3> <div class="element-text">Permian<br /><h3>Location</h3> <div class="element-text">Penrith Sandstone<br />Appleby, Westmorland</div> </div> Description An account of the resource <div class="element"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text">Reddish brown rock. Medium sand grade.<br />Round to sub-round grains of quartz, often with a thin rim of red hematite. Mainly reddish and pink-brown grains, fewer white grains and very few black grains. Well sorted and well cemented.<br />No fizzing with acid, so does not contain significant carbonate.<span> </span><br /><br />Laminations can be observed in sample L326b. There is an inter-layering of coarser and finer laminae.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Fine laminations can be seen when the thin-section is held up to the light.<span> </span><br />Moderately well rounded quartz grains with thin rims of hematite, and overgrowths of quartz in optical continuity with the original grain.<span> </span><br />Occasional grains of very fine quartzite, microcline, plagioclase, mica and decomposed fine-grained igneous rocks.<span> </span><br />Siliceous cement and the secondary quartz<span> </span><a href="/p1acollections/items/show/232">overgrowths</a><span> </span>hold this rock together.</p> <p>The grains are finer as a whole in L326b, and less well rounded.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Probably deposited in an<span> </span><a href="/p1acollections/items/show/167">aeolian</a><span> </span>environment, since it almost entirely comprises well sorted and well rounded quartz grains.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">ferruginous sandstone<br />ferruginous arenite</div> </div> </div> aeolian lamination sorting