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John Faithfull 🌍🇪🇺🏴🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/DogWalkingGeology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DogWalkingGeology</span></a> from yesterday.... Spud has found some garnet-tastic Moine metabasic tuffs(?) or maybe an intrusion. Each knobbly bit is a large garnet crystal, but alas they are never show external crystal faces, and are always stuffed with gazillions of quartz inclusions. Still, lovely to see! <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Garnet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Garnet</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a> <a href="https://mastodon.scot/tags/Proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proterozoic</span></a> 😊</p>
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#proterozoic
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ksircombe<p>More <a href="https://aus.social/tags/geotourism" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geotourism</span></a>, this time in the lovely postglacial landscape of <a href="https://aus.social/tags/Ontario" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ontario</span></a>, <a href="https://aus.social/tags/Canada" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Canada</span></a>, specifically an island in <a href="https://aus.social/tags/SandLake" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SandLake</span></a> on the <a href="https://aus.social/tags/RideauCanal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RideauCanal</span></a>. Always amazing to consider that around 15,000 years ago this spot would have been under at least 1000 metres of ice.</p><p>The rocks at this spot are a mixture of <a href="https://aus.social/tags/Proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proterozoic</span></a> metasediments of the Grenville Supergroup - basically billion year old sedimentary rocks that were well baked and deformed by a major mountain building event that pre-dates the formation of Appalachian Mountains (which formed 'only' 250 million years ago). </p><p>And everything is pretty much covered in lichen... makes close-up images less interesting unfortunately :-)</p>
Tim Holt-Wilson<p>An awesome present from Australia - a lump of Proterozoic banded ironstone from the Marra Mamba Iron Formation (Hamersley region, Pilbara Craton, WA) - 2.4 billion years old. <br>Layered haematite & chert are evidence of fluctuations in primordial ocean oxygenation. <a href="https://mastodon.green/tags/precambrian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>precambrian</span></a> <a href="https://mastodon.green/tags/proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>proterozoic</span></a> <a href="https://mastodon.green/tags/geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geology</span></a></p>
Sisyphus with a Hat<p>This is a very interesting photo. Take on the beach at Ballyliffin, Donegal, it shows the contact between the Termon Formation in the foreground and the Slieve Tooey quartzite Formation on the background. The Termon consists of pellitic schists, and the contact between the 2 is define by a fault, with the top of the older Slieve Tooey being sheered as well. </p><p>Both formations are part of the Argyll Group, the middle group of the Neoproterozoic Dalradian. </p><p>And to crown it off, very near the actual contact, in the center of the photo, we have a Rock pipit posing. </p><p> <a href="https://c.im/tags/geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geology</span></a> <a href="https://c.im/tags/rocks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rocks</span></a> <a href="https://c.im/tags/shearzone" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>shearzone</span></a> <a href="https://c.im/tags/fault" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fault</span></a> <a href="https://c.im/tags/neoproterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neoproterozoic</span></a> <a href="https://c.im/tags/proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>proterozoic</span></a> <a href="https://c.im/tags/quartzite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>quartzite</span></a> <a href="https://c.im/tags/pellite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pellite</span></a> <a href="https://c.im/tags/birds" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>birds</span></a> <a href="https://c.im/tags/birding" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>birding</span></a> <a href="https://c.im/tags/birdwatching" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>birdwatching</span></a> <a href="https://c.im/tags/birdphotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>birdphotography</span></a> <a href="https://c.im/tags/pipit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pipit</span></a> <a href="https://c.im/tags/rockpipit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rockpipit</span></a> <a href="https://c.im/tags/irishbirds" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>irishbirds</span></a> <a href="https://c.im/tags/birdsofireland" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>birdsofireland</span></a> <a href="https://c.im/tags/irishgeology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>irishgeology</span></a></p>
Peter L Bowden<p>One of my favourite <a href="https://mastodon.social/tags/Fridayfold" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Fridayfold</span></a> locations in the Åland Islands, between Finland and Sweden.<br>Flattened pillow lavas buckled by later minor folding.<br><a href="https://mastodon.social/tags/Proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proterozoic</span></a> <a href="https://mastodon.social/tags/SvecoFennian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SvecoFennian</span></a></p>
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