4 10 264 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/cd0887d0796095eddd0dc41b3db1e1dc.jpg 8e4939397352f33d03d66ea841e757b9 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8299c6ff44bb9caa79c67702c74cb2c5.jpg 656cbb57478c378eff753a41a68050dd https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6c4bb513fcf8f9af3b246a26e3b77ab6.jpg 4fcf5efddbe66c008e446fbb8eee5448 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>L361<br /></strong></h2> <h2>Oolitic ironstone</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>Inferior oolite<br />Thrapston, Northamptonshire</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>This rock is made up of light grey sub-spherical<span> </span><a href="/p1acollections/items/show/230">ooids</a>.<span> </span><br />Fine to medium sand grain size.<span> </span><br />A few lithic/biogenic fragments.<span> </span><br />Dark grey cement.<span> </span><br />Small hair-line white veins run through this rock.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Ooids made up of a greenish sheet silicate mineral called<span> </span><span>chamosite</span>, partially altered to<span> </span><span>siderite</span><span> </span>and<span> </span><span>limonite</span>. Concentric structure. Central cores of fine-grained material.</p> <p>A layer formed of brown, transparent crystals, sometimes with rhombic cross-sections surrounds the peripheries of many ooids. This is<span> </span><span>siderite</span>.</p> <p>Some quartz grains.</p> <p>The cement is made up mainly of carbonate (<span>siderite</span>), with a small quantity of a green-brown material, which has anomalous interference colours.</p> <p>This rock is a grainstone (Dunham naming system) or oo-sparite (Folk naming system).</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Deposited in a moderate energy, marine energy.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p><span>Chamosite</span><span> </span>is an Fe-rich chlorite, often greenish. It is a sheet silicate.</p> <p><span>Limonite</span><span> </span>is amorphous or cryptocrystalline, and yellow-brown to brownish-black in colour. It comprises hydrated iron (III) oxides with a range of compositions.</p> <p><span>Siderite</span><span> </span>is iron carbonate (FeCO₃). It is often difficult to distinguish siderite from calcite and dolomite optically.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">oolitic ironstone<br />oolite</div> </div> marine moderate energy ooid https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a208f3e1a4d5b13c2f81d3ec49b5b314.jpg a620047d874c5f7b4353192625ce8f7b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/e237c8cfeee6fc635fea026faf549f99.jpg 081148ca95653367a2ff3adf38dcbe74 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/b5fed400782b1050357184726a850f88.jpg 0f078f721ecc91609d3d3ea52ced6444 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>L370<br /></strong></h2> <h2>Chert, flint nodule</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>Upper Chalk, Cambridgeshire</p> </div> </div> Description An account of the resource <div class="element"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>This rock is made up of<span> </span><a href="/p1acollections/items/show/184">cryptocrystalline</a><span> </span>silica (quartz), black to brown. Being made up of silica, it is hard and displays<span> </span><a href="/p1acollections/items/show/182">conchoidal fracture</a>.</p> <p>This is a flint nodule, which comes from a chalk bed – notice the thin shell of white chalk. Flints are irregular silica concretions characteristic of the upper Chalk.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Cryptocrystalline silica (quartz)<span> </span><br /><a href="/p1acollections/items/show/171">Amorphous</a>, not grains. Partially devitrified<span> </span><br />Uniform texture<span> </span><br />Rare larger quartz crystals</p> <p>Occasional elliptical strips of greater than average grain size probably represent cross-sections of shells now replaced by silica.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Flint nodules are produced by the digenetic<span> </span><a href="/p1acollections/items/show/248">replacement</a><span> </span>of chalk. A silica gel, formed by the dissolution of sponge spicules, precipitates silica in nodules. Chert deposits are more common in organic-rich regions of the chalk, and there is a hypothesis that the silica precipitates in burrows.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">chert<br />flint nodule</div> </div> </div> diagenesis sponge https://wserv3.esc.cam.ac.uk/p1acollections/files/original/ffadc04ed9e3124d98272e135fd7da8f.jpg db59789e6e6fd0e709090ca690e32786 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6947dd2e59661db1bf837d372feb2120.jpg 4d91339ce17b1bc0e945ae3d1d434b1c https://wserv3.esc.cam.ac.uk/p1acollections/files/original/df18c0e4e2bcbbcf532dd5fe47d3863e.jpg ca894e8b7bbf20601e7e6765893c3be6 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>L371<br /></strong></h2> <h2>Chert, bedded</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Early Carboniferous</p> <h3>Location</h3> <div class="element-text"> <p>Carboniferous Limestone<br />Skyes, Bowland, Yorkshire</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Two rock types, with an irregular contact between them.</p> <p>1 – Very dark brown,<span> </span><a href="/p1acollections/items/show/227">microcrystalline</a><span> </span>rock. This fizzes with acid. It is a limestone.</p> <p>2 – Grey and black, intermingled, microcrystalline silica. Brittle and well jointed. Some medium grained white quartz vein material.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>1 – A fine to medium grained mosaic of calcite with cross-sections of foraminifera and other shell material.</p> <p>2 – Microcrystalline silica, quartz forming a uniform mosaic texture, slightly coarser in some places than others. Scattered with grains of calcite and<span> </span><span>opaques</span>, both typically 0.1 mm across. Criss-crossing calcite veins, some dark red-brown discolouration.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">This rock has a complicated history. In essence the chert (2) has replaced the limestone (1). The irregular patches of limestone within the chert are probably relics of pre-existing limestone, but the calcite rhombs are related to the calcite veining and therefore later than the chert. Similarly the opaques, which cut across the structure of the chert, formed later than the chert.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p>The cubic<span> </span><a href="/p1acollections/items/show/206">form</a><span> </span>of the<span> </span><span>opaques</span><span> </span>is suggestive of pyrite, but we cannot be sure.</p> </div> </div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">bedded chert</div> </div> conchoidal microcrystalline replacement https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f6e898cd01802fb7acdebb33ce327862.jpg 63ab96468652d4ce048e01dc652b190f https://wserv3.esc.cam.ac.uk/p1acollections/files/original/dded11a8e088fb9744260bddcb9b5015.jpg cbf87a0795d18f9b11a03ab73acf8183 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0a7fda527a98690dcee575c19b33a611.jpg 6edb633111e026da117eb2b2b9d0ee41 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>L500<br /></strong></h2> <h2>Slate</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Lower Cambrian</p> <h3>Location</h3> <div class="element-text"> <p>Llanberis, North Wales</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Very fine-grained rock with a prominent, well-developed<span> </span><a href="/p1acollections/items/show/180">cleavage</a>. The dark red-purple colour is due to<span> </span><span>iron-staining</span>. The light green smudge is a<span> </span><span>reduction spot</span>.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Mud size grains.<br />Mainly indistinguishable clay minerals.<br />Some quartz, muscovite, opaques.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>The protolith of this rock was a pelite (mudstone). Under low-grade, regional metamorphic conditions, crystals within the pelite were aligned, producing the slaty cleavage.</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<span> </span><br />The red-purple colour of this rock is probably produced by hematite.</p> <p><span>Reduction spot</span><span> </span><br />The dark red-purple of the majority of this rock is due to the presence of iron in the 3+ oxidation state (Fe³⁺). The light green colour of the reduction spot is instead due to the presence of iron in the 2+ oxidation state (Fe²⁺). Hence,<span> </span><em>reduction</em><span> </span>of the iron ions from Fe³⁺<span> </span>to Fe²⁺<span> </span>has taken place in the reduction spot.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">slate</div> </div> Date A point or period of time associated with an event in the lifecycle of the resource Lower Cambrian metapelite reduction https://wserv3.esc.cam.ac.uk/p1acollections/files/original/57eb9d161e24081334fddcaa5522b630.jpg 98a53ec0911ccd3ce20f1096608dfa02 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/e148827aaff78a32a6daf8c169fa2639.jpg 575620169218ba18643aec7f3f6febf5 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/4441d696cc8b2928132fa37dbd6d8e4f.jpg e12bf8a89562af01f31acbf211a2e14f 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>L504</strong></h2> <h2>Garnet schist</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Pre-Devonian</p> <h3>Location</h3> <div class="element-text"> <p>Ny-Friesland, Spitsbergen</p> </div> </div> Description An account of the resource <div class="element"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Strongly developed planar<span> </span><a href="/p1acollections/items/show/192">fabric</a><span> </span>made up of<span> </span><a href="/p1acollections/items/show/237">platy</a><span> </span>biotite mica and muscovite mica grains and lenses of quartz grains. Fabric wraps around large,<span> </span><a href="/p1acollections/items/show/189">euhedral</a><span> </span>garnets, typically ~2mm across. Quartz, the most soluble mineral, has recrystallised at the corners of the “eyes”, in the pressure shadows of the garnets.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Bands of interlocking quartz grains and some feldspar (plagioclase and alkali,<span> </span><a href="/p1acollections/items/show/169">lamellar twinning</a><span> </span>and<span> </span><a href="/p1acollections/items/show/170">alteration</a>), alternate with bands composed of needles of biotite mica and muscovite mica, about 50:50.</p> <p>Quartz displays<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a>, and being the most soluble mineral in this rock has recrystallised into the pressure shadows around the garnets.</p> <p>The fabric is interrupted by large<span> </span><a href="/p1acollections/items/show/189">euhedral</a><span> </span>garnet crystals. Characteristically the garnets are<span> </span><a href="/p1acollections/items/show/213">isotropic</a><span> </span>and have high<span> </span><a href="/p1acollections/items/show/247">relief</a>. They contain<span> </span><a href="/p1acollections/items/show/210">inclusions</a><span> </span>of quartz and mica.</p> <p>Accessory minerals:<span> </span><br />- chlorite<span> </span><br />-<span> </span><span>staurolite</span><span> </span><br />- tourmaline</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>This schist contains large quantities of muscovite indicating that it had a pelitic protolith. This pelite was subjected to high pressures and temperatures during regional metamorphism, resulting in the crystallisation and alignment of metamorphic minerals.</p> <p>The<span> </span><a href="/p1acollections/items/show/198">foliation</a><span> </span>of this schist may be due to original compositional banding in the pelite; the quartz-rich layers having been sandy layers, while the mica-rich layers were muddy.</p> <p>Some evidence for post-metamorphic deformation: quartz displaying undulose extinction; micas are wrapped around the garnet grains.</p> <p>Tiny grains of chlorite found around the edges of the garnets indicate that some retrogradation has taken place. Chlorite is a common break-down product of garnets.</p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p>In thin-section<span> </span><span>staurolite</span><span> </span>is pale-golden in colour. It has high relief, and displays straight<span> </span><a href="/p1acollections/items/show/190">extinction</a><span> </span>and 1st order birefringence colours.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">garnet schist</div> </div> </div> fabric foliation metapelite https://wserv3.esc.cam.ac.uk/p1acollections/files/original/d3eb994c3d6575e87d3c2adcbe5e5671.jpg 2a16c884a7af786c6616089ae2bc1421 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/acdbe621cb181f8585188f05bae056ad.jpg d92f142e31dd65ca4db820ec44f62f08 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/d1c6257526bc338ea4213e11d7061ba8.jpg 9b3c3e978edb4fab3ca1d81922539629 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>L520<br /></strong></h2> <h2>Quartzite</h2> Subject The topic of the resource <h3>Specimen Age</h3> <div class="element-text"> <p>Carboniferous</p> <h3>Location</h3> <div class="element-text"> <p>Coal measures<br />Corrie, Arran</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Almost entirely made up of fine sand sized quartz grains. Does not fizz with acid, so no carbonate present. Clean white rock, apart from pink-brown weathering. Dark carbonaceous marks are plant roots.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Subangular quartz grains, typically 0.25 mm across with<span> </span><a href="/p1acollections/items/show/257">sutured contacts</a>.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">The sutured contacts between the quartz grains indicate that this rock has been metamorphosed to a quartzite. This is a very well recrystallised rock. The protolith was a fine-grained quartz arenite (&lt;15% matrix), but we cannot tell how angular or spherical the original grains were as they have been partially dissolved by pressure solution to form sutured contacts.</div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">quartzite</div> </div> suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a7df9ee4ba246ad0597901f02ce9248e.jpg c00e1ed63dab525439bafbcd93e404ad https://wserv3.esc.cam.ac.uk/p1acollections/files/original/a96297a90c4701546417a62762349b0c.jpg 10d02e1fb68349bfd8e84366835b2ca5 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/5ef179694fabe2f138284ddd124cda39.jpg 712079ecee63ba6327aad3a1eddff03e 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>L521<br /></strong></h2> <h2>Quartzite</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Precambrian</p> <h3>Location</h3> <div class="element-text"> <p>Braemar, Aberdeenshire</p> </div> </div> Description An account of the resource <div class="element"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Buff coloured rock.<br />Almost pure quartz, which has been very well recrystallised.<br />Faint banding could be original bedding.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Fine to medium grained recrystallised quartz with<span> </span><a href="/p1acollections/items/show/257">sutured contacts</a>.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>The sutured (ragged) grain boundaries and<span> </span><a href="/p1acollections/items/show/263">undulose extinction</a><span> </span>of the quartz grains indicate that this rock formed under relatively low temperature metamorphism. Had the rock been raised to higher temperatures perfect 120° grain boundaries would have formed, and the quartz would not be strained.</p> <p class="NoSpacing">Inserting the sensitive tint plate results in the vast majority of grains changing colour in the same way – most of the grains simultaneously display higher interference colours in one orientation, and lower interference colours in the other orientation. This strong<span> </span><a href="/p1acollections/items/show/192">fabric</a><span> </span>was produced by recrystallisation under directed stress, which caused all the grains to elongate in one direction. </p> </div> </div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">quartzite</div> </div> </div> banding foliation suture https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3a257895e552cc9a42e6ac5774407bd9.png dc2dad9fd7d160c31562b376fefd5d86 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/681a3322d8361d0effa47eeba5bf16f5.png e29f38b5f17fc831df2d51da1a9a7ab4 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>TF0101<br /></strong></h2> <h2>Dunbarella</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Carboniferous</div> Description An account of the resource <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Permian to Carboniferous</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Bivalvia<br />Order: Pectinida<br />Family: Pterinopectinidae</div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Ribs<br />Umbo<br />Growth lines</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Compression between mud layers<br />Potentially carbonization, though could be simply an external mould</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text">Because of the bilateral symmetry and preservation at first glance this could be mistakenly identified as a brachiopod. Other specimens, with different preservation, show that this is in fact a bivalve, and once you have seen enough of these you will know that <em>Dunbarella</em> is a bivalve not a brachiopod.</div> </div> symmetry https://wserv3.esc.cam.ac.uk/p1acollections/files/original/68706e044dabbaeaa65efeeb270d7144.png 6d189212c6e1ef5dc5c20ece770934de https://wserv3.esc.cam.ac.uk/p1acollections/files/original/5fa32bd97f9d6efed25d1d3ea2d92bc9.png 9b4f5a3ec142e9190442e400fdd949b2 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>TF0102<br /></strong></h2> <h2>Liostrea</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Jurassic</div> Description An account of the resource <div class="element"> <h3>Species</h3> <div class="element-text">Liostrea</div> </div> <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Triassic to Eocene</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Bivalvia<br />Order: Gryphaeidae</div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Growth lines<br />Two articulating valves<br />Adductor muscle scar</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Original shell material</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text"> <p>Much like modern oysters<span> </span><em>Liostrea<span> </span></em>lived as a stationary epifaunal suspension feeder, encrusting hard substrates, after an initially planktonic larval stage.</p> </div> </div> oyster symmetry https://wserv3.esc.cam.ac.uk/p1acollections/files/original/68cd5408832e8920f4130571bd4941fb.png cb4dc9dc532af24644a44cfa0babaa34 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/fe0774b486c5eeca25d026d816434661.png c1291e523262e8445f141252542a040d 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>TF0103<br /></strong></h2> <h2>Trigonia</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Jurassic</div> Description An account of the resource <div class="element"> <h3>Stratigraphic Range</h3> <div class="element-text">Jurassic to recent</div> </div> <div class="element"> <h3>Taxonomy</h3> <div class="element-text">Phylum: Mollusca<br />Class: Bivalvia<br />Order: Trigoniida<br />Family: Trigoniidae</div> </div> <div class="element"> <h3>Distinctive Features</h3> <div class="element-text">Ribs<br />Dentition, hinge<br />Growth lines</div> </div> <div class="element"> <h3>Preservation</h3> <div class="element-text">Set 1:<br />Mineral replacement of shell (aragonite to calcite)<br />Set 2:<br />Disarticulation of valves<br />Sediment infil (oolitic ironstone, which gives the reddy colour to the specimen)<br />Mineral replacement of shell (aragonite to calcite)</div> </div> <div class="element"> <h3>Advanced notes</h3> <div class="element-text">Strong ribs are present on the anterior part of the shell - perhaps to discourage predators or as a response to a high energy environment?</div> </div>