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https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6632e388363a536b4fa89fbce0b5a699.jpg
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https://wserv3.esc.cam.ac.uk/p1acollections/files/original/9901453206757825164066c3b5133da2.jpg
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https://wserv3.esc.cam.ac.uk/p1acollections/files/original/604a1c135c80a190d334065f23bba33a.jpg
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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>L331<br /></strong></h2>
<h2>Sandstone, wacke</h2>
Subject
The topic of the resource
<h3>Specimen Age</h3>
<div class="element-text">Silurian<br /><h3>Location</h3>
<div class="element-text">Austwick Grit<br />Austwick, Yorkshire</div>
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Description
An account of the resource
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<h3>Hand Specimen</h3>
<div class="element-text">Dark grey rock, mainly fine sand.<br />Does not react with acid, probably mainly quartz.<span> </span><br />Some glints of mica.<span> </span><br />Cement reacts with acid, so it is at least partially carbonate.<span> </span><br />Band of brown-grey material is due to weathering.</div>
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<h3>Thin-section</h3>
<div class="element-text">The thin-sections are only cut from dark grey, unweathered region of the rock. They are best viewed under high magnification.<br /><br />Sub-angular to sub-rounded quartz grains. Mainly fine sand, with a significant proportion of silt. >15% clay, so this is a wacke.<br />A few white mica flakes and opaque grains.<br />The main cement is carbonate, though the grains are also partially cemented by the clay grade grains.</div>
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<h3>Rock History</h3>
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<p>Wackes are commonly produced by<span> </span><a href="/p1acollections/items/show/261">turbidity currents</a>, though we cannot be sure without seeing graded bedding.</p>
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<h3>Rock Name</h3>
<div class="element-text">sandstone<br />wacke</div>
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turbidity current