1 10 5 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/525a241f1ce2f94ad242f5ec092f3c76.jpg cde1d2a26fd2c6910cebfd1899914898 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/689c24718bf255b4704657c58dcc5233.jpg 3c71ef349643240db6d58e500485eba3 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/d2711c16055d4ee6c63aeb3d711fcc80.jpg 166a017771d3f3e68a9511e71f97d465 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/bc9f99fb9db7ea2ca968f0e6a1eabe25.jpg 8873cd3567483ef43a551eb10aaafbca https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6ed13a674224bdc3c93b262cc6e97792.jpg a7687b21c3602304b9ca9de2153202a4 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0b64b5226c627127a81eb64a3ee7a171.jpg e32098b5ba06e5cd80f55eaefc43cf8b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/30f248264c6c30136e90aa83eac8eeef.jpg 9fca7631e1dbb5a6faa2dc37bd104852 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>L350<br /></strong></h2> <h2>Limestone, argillaceous</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Jurassic</p> <h3>Location</h3> <div class="element-text"> <p>Purbeck<br />Near Salisbury</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Pale yellow-grey mudstone containing the fossil remains of a<span> </span><span>small arthropod with a segmented exoskeleton.</span><span> </span><br />The rock is banded and shows some surface discolouration due to weathering.<br />Rock fizzes with acid, so contains carbonate.<span> </span><br />This is a soft, though well consolidated limestone (the surface has been scratched).</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Moving across the slide, perpendicular to the laminations, there are alternations (gradual transitions) between calcareous mudstone and<span> </span><a href="/p1acollections/items/show/176">argillaceous</a><span> </span>limestone. One band is rich in angular quartz grains (0.1 to 0.2 mm), and contains carbonate shell fragments.</p> <p>Calcite mudstone – fine-grained mosaic of calcite, small proportion of transparent brown impurity and a few small grains of quartz.</p> <p>Argillaceous limestone – even finer grained calcite mosaic, more abundant brown material (probably organic) than in the calcite mudstone.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Low energy, aqueous environment.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text">The fossil remains are those of Archaeoniscus, a small crustacean (which belongs to the arthropods), of supposed freshwater origin. With this extra knowledge it may be inferred that the rock was deposited in fresh water.</div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">argillaceous limestone</div> </div> aqueous arthropod fossil low energy https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4d660cc7e88f1a09293f8f1cfb0141a4.jpg e3d1332f28dfb74246d9c020be38afe8 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/275bfe6e51cf0c00750113931bfde0a2.jpg 3181f15a157a6e130504affccf31e37f https://wserv3.esc.cam.ac.uk/p1acollections/files/original/209c57cf6df9a68b526bd1b50071f5ed.jpg 35569654b213a0c11e326d470c29a08d 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>L327<br /></strong></h2> <h2>Sandstone, ferruginous</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Cretaceous</p> <h3>Location</h3> <div class="element-text"> <p>Carston, Lower Greensand<br />Hunstanton</p> </div> </div> Description An account of the resource <div class="element"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Mainly medium sand (to coarse sand in the case of L327a).<span> </span><br />Yellow-brown<span> </span><span>iron stained</span><span> </span>quartz, cemented by the same yellow brown oxide. A few larger quartz grains up to 5 mm long. Grains are angular to sub-rounded, and poorly sorted.<span> </span><br />Fizzing with acid, indicating that there is a carbonate cement.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Angular to sub-angular grains of quartz, displaying<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a>.<span> </span><br />Most have thin brown rims of iron oxide.<span> </span><br />A few grains of feldspar.<span> </span><br />Minor carbonate cement (sparite).</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Deposited in an aqueous environment, since it is not clean enough to be<span> </span><a href="/p1acollections/items/show/167">aeolian</a>.</p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p><span>Iron staining</span><span> </span><br />Hematite (Fe₂O₃) → red (blood-red, cherry-red, brown-red) iron-staining<span> </span><br />Limonite (FeO(OH)•nH₂O) → yellow or brown iron-staining</p> <p>The yellow colour of this rock is probably produced by limonite.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">ferruginous sandstone</div> </div> </div> aqueous sorting https://wserv3.esc.cam.ac.uk/p1acollections/files/original/00f841abc429436b12138c68e9e1d2de.jpg 7a9247d7745cda074637c5b09e12aa1f https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f88c1bb129d373b147642f8efdbe0b01.jpg 6a29f5dce510fba60873bf7f5c362052 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4c5c6e868e4ecb7a96c6dbacd3fe9d99.jpg 188fa31e087acc0ba82ee2bfd560f8fa 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>L325<br /></strong></h2> <h2>Sandstone, calcareous cement</h2> Subject The topic of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <h3>Age</h3> </div> </div> </div> <div class="element-set"> <div class="element"> <div class="element-text">Jurassic<br /><br /><div class="element-set"> <div class="element"> <h3>Location</h3> <div class="element-text">Portland Group, Shotover Hill, Oxford</div> </div> </div> </div> </div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element-set"> <div class="element"> <div class="element-text"> <h3>Hand Specimen</h3> </div> </div> </div> <div class="element-set"> <div class="element"> <div class="element-text">Pale grey rock, mainly medium to coarse grained quartz sand. Poorly sorted.<span> </span><br />Small amounts of lithic fragments up to 10 mm across, and shell fragments.<span> </span><br />Contains &lt;15 vol% clay, making it an arenite.<br />Pale grey cement fizzes with acid, indicating that it is carbonate.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Quartz grains, sub-angular to sub-rounded, occasionally rounded, displaying<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a>.<span> </span><br />Lithic fragments including flint and quartzite.<span> </span><br />Some grains of feldspar.<span> </span><br />Rare small<span> </span><span>green clasts</span>.<span> </span><br />Grain supported.<span> </span><br />Cemented by a sparry calcite cement. The cement crystals are large, each enclosing a number of sedimentary grains.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Deposited in an aqueous environment; grains are not rounded enough to have been deposited in an<span> </span><a href="/p1acollections/items/show/167">aeolian</a><span> </span>environment.</p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p>The rare<span> </span><span>green clasts</span><span> </span>are made up of a<span> </span><a href="/p1acollections/items/show/184">cryptocrystalline</a><span> </span>material, which may be a type of amphibole called glauconite, and some rather decomposed rhyolite or andesite.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">Calcareous sandstone<br />Calcareous arenite</div> </div> </div> </div> </div> </div> aqueous sorting https://wserv3.esc.cam.ac.uk/p1acollections/files/original/32a05eeb9aabaf5fb28349a082d5c394.jpg 02b0bedfd37de54daaf46474c660f569 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/65b615211cc1922e57de5ae5e048795e.jpg 84867e2d04166abe4cf5d4729cbc41dc https://wserv3.esc.cam.ac.uk/p1acollections/files/original/c8be6e16095920cbfd64b604e493e1a4.jpg e1bbccc19d642b02fb9155ebe414a979 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>L324<br /></strong></h2> <h2>Sandstone, feldspathic arenite</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Precambrian<br /><h3>Location</h3> <div class="element-text">Torridonian Group, North West Scotland</div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element-set"> <div class="element"> <div class="element-text"> <h3>Hand Specimen</h3> </div> </div> </div> <div class="element-set"> <div class="element"> <div class="element-text">Reddish brown rock made up of pinkish feldspar, colourless quartz, and some dark grey grains. Medium to coarse sand. Moderately rounded. Fairly well sorted.<span> </span><br />Contains &lt;15 vol% clay, so this is an arenite.<span> </span><br />No fizzing with acid, so does not contain significant carbonate.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Quartz (~65%)<span> </span><br />- Includes fresh quartz grains with<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a>, quartzite grains with internal<span> </span><a href="/p1acollections/items/show/257">sutures</a>, and quartz vein material. Some quartz grains have opaque rims.</p> <p>Feldspar (~35%)<span> </span><br />- Mainly microcline, some plagioclase. Some<span> </span><a href="/p1acollections/items/show/228">microperthite texture</a><span> </span>and decomposition to clays.</p> <p>All grains are moderately rounded and fairly well sorted. The rock is well compacted. A thin film of cement mainly hematite and clay coats the grains.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>This rock contains too much feldspar, and the grains are not sufficiently well rounded nor well sorted to have been deposited in an<span> </span><a href="/p1acollections/items/show/167">aeolian</a><span> </span>environment. The sediments were deposited in an aqueous environment.<br /><br /><br /></p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text"> <p>sandstone<br />feldspathic arenite</p> </div> </div> </div> </div> </div> </div> aqueous compacted sorting https://wserv3.esc.cam.ac.uk/p1acollections/files/original/de416cb250390ced9266b0dc46e032ab.jpg e6c675e8595cdeae101d2c42a98541da https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3de35d39290e782696bc440ea5d5882c.jpg d61148549d7e0e0ec79e4fdf95957213 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/941313bb34f96b29318b1045b7884989.jpg 6a0f1becf00fa29aed87ddf02b468b15 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>L323<br /></strong></h2> <h2>Sandstone, arenite</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Jurassic<br /><br /><h3>Location</h3> <div class="element-text">Estuarine Series, North Yorkshire</div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <h3>Hand Specimen</h3> </div> </div> </div> <div class="element-set"> <div class="element"> <div class="element-text">Pale yellow grey rock, almost entirely made up of medium sand quartz grains. These are sub-rounded, very well sorted, and are held together by a matrix of siliceous silt. Contains a significant amount of clay, but &lt;15 vol%, so it is an arenite.<span> </span><br />No fizzing with acid, so does not contain significant carbonate.<span> </span><br />Weakly laminated.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text">Sub-round grains of quartz, some opaque grains and a few flakes of white mica.<span> </span><br />Siliceous, silty matrix.</div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>This rock was deposited in a moderate energy, aqueous environment. The grains are not well rounded enough to be<span> </span><a href="/p1acollections/items/show/167">aeolian</a><span> </span>sediments.</p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text"> <p>sandstone<br />arenite</p> </div> </div> </div> aqueous sorting