2 10 264 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6ee5b4daa895a80c4f5d1219f546fd1f.jpg ec992c8fa5fc180cef9aa183c5fccb0b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f04b282ccc316fc1d49d4170730b5892.jpg 7759e3afb21758ccf4ccadb89eb40ce9 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/d5a2b07e623f5f5b39a9506ee7ac050f.jpg 41972d8ec488fd6c039ae81709eaf2e3 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>L161<br /></strong></h2> <h2>Basalt, amygdaloidal</h2> Subject The topic of the resource <h3>Specimen Age</h3> <div class="element-text"> <p>Cenozoic</p> <h3>Location</h3> <div class="element-text"> <p>Lava, Skye</p> </div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <div class="element-text"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <div class="element-text"> <div class="element-text"></div> </div> </div> </div> <div class="element"> <div class="element-text five columns omega"> <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"> <p>Fine-grained, greenish black rock comprising dark and white minerals.<span> </span><br />Contains<span> </span><a href="/p1acollections/items/show/172">amygdales</a>, mostly white, though some have black cores.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Fine-grained plagioclase<span> </span><a href="/p1acollections/items/show/215">laths</a><span> </span>and irregular clinopyroxene (augite) grains, replaced with calcite. Many of the plagioclase laths have been almost entirely altered.</p> <p>The amygdales are filled with<span> </span><span>zeolite</span>, growing in spherulitic and radiate patterns. Many have rims of calcite and fine-grained chlorite.</p> <p>Some vein material -<span> </span><a href="/p1acollections/items/show/203">granular</a><span> </span>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>Fine-grained → rapid,<span> </span><a href="/p1acollections/items/show/191">extrusive</a><span> </span>crystallisation.<span> </span><br />Gas bubbles trapped within lava produced<span> </span><a href="/p1acollections/items/show/264">vesicles</a>.<span> </span><br />Circulation of fluids → precipitation of zeolite within the vesicles.</p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p><span>Zeolites</span><span> </span>are produced at low temperatures. They are commonly precipitated in basaltic volcanic piles.</p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">amygdaloidal basalt</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> alteration extrusive mafic https://wserv3.esc.cam.ac.uk/p1acollections/files/original/852a77355d6e4e7f6cf8052de0bf7a9d.jpg 3418fba1e4453736b6dbd51d55fd9583 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/aab79550a27397bff8be8a5cb67ef43f.jpg f5f51d065ee3cc8e993e930077cbd5fc https://wserv3.esc.cam.ac.uk/p1acollections/files/original/1c200ce8cf23f154e881c3c62ad865c8.jpg 25a8c42f179836492f49a6fdb0bcbb5f https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f3204ba875eb0b5fb7aaffafd6e91261.jpg 6a3a28ccf49c7653bc57780b5eacdd11 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/57c910796611238dbf565e32ca5fc702.jpg d53f7084c610e651bdaf2389f9297e28 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>L162<br /></strong></h2> <h2>Basalt, porphyritic</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>Volcanic neck, Lion's Haunch, Arthur's Seat, Edinburgh</p> </div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <div class="element-text"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <div class="element"> <div class="element-text five columns omega"></div> </div> <div class="element"> <div class="element-text five columns omega"> <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"> <p>Black,<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/244">porphyritic</a><span> </span>rock comprising black clinopyroxene, grey feldspar and greenish olivine<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/236">phenocrysts</a>, in a fine-grained<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/205">groundmass</a>.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Plagioclase feldspar<span> </span><br />- Phenocrysts 1-4mm long, with a euhedral,<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/258">tabular</a><span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/206">form</a>. Randomly orientated. Characteristic<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/169">lamellar twinning</a>. Some are<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/267">zoned</a>.<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/210">Inclusions</a><span> </span>of magnetite, clinopyroxene and other minerals. Extensive<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/170">alteration</a><span> </span>along abundant cracks.</p> <p>Clinopyroxene (augite)<span> </span><br />-<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/189">Euhedral</a><span> </span>phenocrysts, 1-2 mm across. Moderate<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/247">relief</a>, inclined<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/190">extinction</a><span> </span>and first order pink to second order orange interference colours. Pale pink in thin-section. Some are<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/267">zoned</a>.</p> <p>Olivine<span> </span><br />- Very few phenocrysts are fresh enough to be easily identifiable. These are colourless in plane polarised light, have moderate relief, and up to second order pink interference colours. No<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/180">cleavage</a>.</p> <p>- 1st phase of alteration along cracks: The majority of the phenocrysts have been completely altered to greenish serpentine.</p> <p>- 2nd phase of alteration: orange brown mineral – probably the amphibole<span> </span><span>cummingtonite</span>. Characteristic curving cracks and the<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/246">prismatic</a><span> </span>form of olivine are still visible.</p> <p>Groundmass<span> </span><br />- Fine-grained. Plagioclase feldspar needles, clinopyroxene, some olivine (mostly altered), and opaques, probably magnetite. Occasional calcite grain.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Two stage cooling<span> </span><br />1. Phenocrysts grow slowly in a magma chamber.<span> </span><br />2. Fine-grained groundmass grew rapidly →<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/191">extrusive</a>.<span> </span><br />Hydrothermal alteration, possibly as part of the<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/266">volcanic</a><span> </span>pile.</p> </div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"><span>Cummingtonite</span><span> </span>is an amphibole. It is colourless to pale green in thin-section, has moderate relief and two cleavages which intersect at 56°.</div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">porphyritic basalt</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> alteration extrusive volcanic https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3a045ee9b56d4f42ca318e0623d82bac.jpg 9de28fb8f3aa176785607b86ed35a349 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/ad163c9708faad229d3b45dfe05cc6d2.jpg c1d47de48160ed5d95eaa51938891095 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/9a8a6274518a04739a23711773ab19ae.jpg 9d09b58110825fcd56646bf1cec98d2b 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>L172<br /></strong></h2> <h2>Ultramafic cumulate</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Precambrian<br /><br /><h3>Location</h3> <div class="element-text">Lewisian Complex, Dyke<br />Assynt, Sutherland</div> </div> Description An account of the resource <div class="element-set"> <div class="element"> <div class="element-text"> <div class="element"> <div class="element-text five columns omega"> <h3>Hand Specimen</h3> </div> </div> <div class="element"> <div class="element-text five columns omega"> <div class="element-set"> <div class="element"> <div class="element-text">Greenish black, coarse-grained rock, comprising olivine, clinopyroxene and plagioclase.<br />Grains typically 1-2 mm across.<span> </span></div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Olivine<span> </span><br />-<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/256">Subhedral</a><span> </span>to<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/189">euhedral</a><span> </span>grains making up ~45% of the rock.<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/170">Alteration</a><span> </span>to magnetite and serpentine, particularly along the curving cracks. Cracks across the thin-section, could be due to expansion of the rock as the olivine was altered.</p> <p>Clinopyroxene<span> </span><br />-<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/211">Interstitial</a><span> </span>phase making up ~35% of the rock. Moderate<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/247">relief</a>, inclined<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/190">extinction</a> and first order pink to second order orange interference colours.</p> <p>Plagioclase feldspar<span> </span><br />- Interstitial phase making up ~20% of the rock. Low first order interference colours and<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/169">lamellar twinning</a>.</p> <p>Accessory minerals - Biotite, small, interstitial grains, altered.</p> <p>This is a cumulate rock. It has undergone late-stage shear banding.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text"> <p>Olivine<span> </span><a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/236">phenocrysts</a><span> </span>crystallised first.<span> </span><br />Clinopyroxene grew around the olivine phenocrysts.<span> </span><br />Interstitial feldspar filled in the remaining gaps.<span> </span><br />Shearing of the rock produced bands of deformation.<span> </span><br />Hydrothermal alteration.</p> </div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">ultramafic cumulate</div> </div> </div> </div> </div> </div> </div> </div> alteration euhedral interstitial shear ultramafic https://wserv3.esc.cam.ac.uk/p1acollections/files/original/84c1834164497c8491f5db12efcef6d2.jpg c9a7faba04f5ca2d06682176ab35e8a8 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/b718221d8d279140605b8befd4e9d749.jpg 691b6ce9581e994fa11d953b4fd41bfb https://wserv3.esc.cam.ac.uk/p1acollections/files/original/c501e1086a63d3623e85cb1f1be70780.jpg b09c139b55148cacb06439964118c472 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>L200<br /></strong></h2> <h2>Volcanic Breccia</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Carboniferous</p> <h3>Location</h3> <div class="element-text"> <p>Melrose, Scotland</p> </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"> <p>Sedimentary textures, very poorly sorted.<span> </span><br />Sub-round to angular grains up to 20mm across.<span> </span><br />Wide variety of clasts: dark purple, cream, rusty orange, grey, several types of lava.<span> </span><br />Some black, shiny igneous crystals.<span> </span><br />Brown-grey matrix of<span> </span><a href="/p1acollections/items/show/266">volcanic</a><span> </span>ash.</p> </div> </div> <div class="element"> <h3>Thin section</h3> <div class="element-text">Wide range of clasts including<br />- Basalt<br />- Slate or phyllite<br />- Schist<br />- Chert<br />- Sandstone<br />- Carbonate<br />- Quartz<br /><br />Matrix of fine volcanic ash.</div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">This is an example of the coarser type of material deposited by explosive volcanic action.<br /><br />NB,<br />This is not a typical volcanic breccia, as one usually sees a greater abundance of igneous clasts; other clasts could be wall-rock. Another name for this rock could be “lithic wacke”.</div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">volcanic breccia<br />lithic wacke</div> </div> </div> clastic extrusive lithic https://wserv3.esc.cam.ac.uk/p1acollections/files/original/ccf4a152eba569461bf6ef055f4b1967.jpg 09fce135a7daa260d1040c49fa782944 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/f138a19e1e584077538e0a5fb26e22db.jpg 01aab9478722295690d2c9ca02f53a9b https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8bb0c75035b89eb9fa8462899036cdf4.jpg 4ac94845dc4d2450665869ea8855f2ea 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>L201<br /></strong></h2> <h2>Tuff</h2> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Fine-grained, blue-green, sedimentary texture.<span> </span><br />Slaty<span> </span><a href="/p1acollections/items/show/180">cleavage</a>.<span> </span><br />Some patches of lighter and finer-grained material.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Slaty cleavage due to the alignment of chlorite and muscovite.<span> </span><br />Cross-cut by the blobs of the fine-grained material. These are orange-brown in thin-section. Could be water-lain ash, ripped-up to form clasts.<span> </span><br />Very fine-grained, brown matrix, probably<span> </span><a href="/p1acollections/items/show/266">volcanic</a><span> </span>ash.<span> </span><br />Carbonate, quartz and opaque clasts slightly larger than the matrix.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Fine-grained volcanic ash deposited by an explosive volcanic eruption has undergone low grade metamorphism to produce a slaty cleavage.</div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">tuff</div> </div> cleavage metamorphism slaty 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>L300<br /></strong></h2> <h2>Granulometer</h2> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Six vials containing unlithified terrigenous sediments of different grain sizes. These are:</p> <table><tbody><tr><td> </td> <td>grain size (mm)</td> <td>grain size (phi)</td> </tr><tr><td>Very coarse sand</td> <td>1-2</td> <td>-1-0</td> </tr><tr><td>Coarse sand</td> <td>0.5-1</td> <td>0-1</td> </tr><tr><td>Medium sand</td> <td>0.25-0.5</td> <td>1-2</td> </tr><tr><td>Fine sand</td> <td>0.125-0.25</td> <td>2-3</td> </tr><tr><td>Very fine sand</td> <td>0.063-0.125</td> <td>3-4</td> </tr><tr><td>Mud</td> <td>&lt;0.063</td> <td>&gt;4</td> </tr></tbody></table></div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text">These are not sections cut from a rock. They are cut from a block of resin containing sedimentary grains. Use these sections to familiarise yourself with grain sizes, as seen in thin-section.</div> </div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">granulometer</div> </div> Grain size https://wserv3.esc.cam.ac.uk/p1acollections/files/original/00db217bd8288150c439f1ca37a8cfec.jpg 20ab67c34086aeea11bab20c8a79886e https://wserv3.esc.cam.ac.uk/p1acollections/files/original/dec6f2245ea893d30d732fad22681274.jpg 2c9eeea810ad45f5041e688c15f68300 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/df792c1dff764855c0f5a8bca4f4832b.jpg ea4c3e9e50b4e890ff1f6c1f86466fdb 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>L310<br /></strong></h2> <h2>Breccia</h2> Subject The topic of the resource <h3>Specimen Age</h3> <div class="element-text"> <p>Permian</p> <h3>Location</h3> <div class="element-text"> <p>Brockram, Cumbria</p> </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"> <p>Very poorly sorted.Angular to sub-angular clasts up to 30 mm long. Randomly orientated.<span> </span><br />Clasts mainly pale grey, some white, some red.<span> </span><br />Red-brown colour of the fine-grained matrix indicates<span> </span><span>iron staining</span>.<span> </span><br />Matrix and some clasts fizz with acid, indicating that they are made of carbonate. This is a limestone.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text">Variety of clasts: sedimentary rock fragments, carbonate and feldspar crystals, fine-grained quartz and carbonate, some bioclasts. Clasts are quite angular.<br />Matrix of very fine-grained clays containing fragments of quartz and carbonate.</div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Clast-supported. Clasts are angular, so sediments cannot have been transported far. (NB, if this rock were matrix supported the clasts could have been transported a long way without losing their angularity.)<span> </span><br />Probably scree accumulation during desert conditions, from approximately the same horizon as L326.</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 red-brown colour of this rock is probably produced by hematite.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">breccia</div> </div> </div> clastic scree https://wserv3.esc.cam.ac.uk/p1acollections/files/original/9c74043dd4765743a7af9b90b0f50ef4.jpg ac96894746f8137ce25d5f1f809dfa00 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/afce700bce529e295af89d899592b41e.jpg ef8d9d97da68dd0afcc64131b171809e https://wserv3.esc.cam.ac.uk/p1acollections/files/original/0e48212f1384b76ca45fc688ba4e0b6d.jpg 0efd2cfb2ca972cc8e8ebbb0583ac682 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>L311<br /></strong></h2> <h2>Conglomerate</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text">Eocene<br /><h3>Location</h3> <div class="element-text">Hertfordshire</div> </div> Description An account of the resource <div class="element-set"> <div class="element"></div> </div> <div class="element-set"> <div class="element"> <h3>Hand Specimen</h3> <div class="element-text">Poorly sorted. Rounded clasts up to ~15 mm long.<span> </span><br />Pale yellow matrix of quartz grains.<span> </span><br />Cement fizzes with acid, indicating that it contains carbonate.<span> </span><br />This conglomerate is just clast-supported.</div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Rounded clasts of very dark red brown<span> </span><a href="/p1acollections/items/show/171">amorphous</a><span> </span>silica (chert) and<span> </span><a href="/p1acollections/items/show/242">polycrystalline</a> quartz.</p> <p>Matrix of quartz grains (typically 0.25 mm) and fine-grained carbonate cement (sparite). Dark red-brown<span> </span><span>iron staining</span>.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Deposited in a high energy environment.</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 red-brown colour of this rock is probably produced by hematite.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">conglomerate</div> </div> </div> clast supported high energy 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 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