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I want to find one of these and leave them some d20s.
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Stratifications - Capo d'Orlando, 2024
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As seems to happen fairly regularly, I found myself in the John Day Fossil Beds again, leading and helping out with geology hikes through the hills.
The particular topics I wanted people to get out of this hike was the relationship between rock strength and landscape shape. See the round, symmetric hill in the center of the above photo? It is made of almost unconsolidated (soft) clay and silt with very low strength. Below it is a cliff ledge of much harder rock, an ancient lahar (volcanic mudflow) which turned to concrete-like stone after flowing down an ancient river valley. This harder rock sits directly below the soft clay, holding it up.
Even in places where rocks and hills all look roughly the same, as in this part of Oregon, there is often incredible nuance to be found within the landscape.
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New art challenge : use picture of crystals and other rocks under polarized light as colour palettes for your ocs.
I invite yall to go and look for more they can be breathtaking ! Also making two colour schemes for your ocs one from the u polarized light and one from the polarized light sounds amazing
The Banded Iron Formation (BIF) near Gairloch, Scotland, is an ancient geological feature dating back to the Paleoproterozoic era, around 2.4 billion years ago. BIFs are distinctive sedimentary rocks consisting of alternating layers of iron-rich minerals and silica (typically in the form of chert), and they hold key clues to Earth’s early atmospheric and oceanic conditions. In Gairloch, the BIF is part of the Loch Maree Group, which is a sequence of metamorphosed volcanic and sedimentary rocks. This BIF formed during a time when the Earth’s oceans were rich in dissolved iron due to the lack of oxygen in the atmosphere. When oxygen started to be produced by photosynthetic microorganisms (such as cyanobacteria), it reacted with the iron in the oceans, precipitating out as iron oxide minerals. This process led to the formation of these alternating bands of iron and silica over millions of years. The Gairloch BIF is significant because it represents evidence of some of the earliest stages of oxygenation on Earth, known as the Great Oxidation Event (GOE). This event fundamentally changed the composition of the Earth’s atmosphere and oceans, allowing for the development of more complex life forms. The BIF also provides insights into the tectonic and volcanic activity during the early Proterozoic, as it is associated with volcanic rocks in the region. Due to its age and the tectonic activity that occurred in the area, the Gairloch BIF has undergone significant metamorphism. Despite this, the iron bands are still evident, and geologists study these formations to understand early ocean chemistry, the nature of ancient life, and the evolution of Earth’s atmosphere.
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From Left to Right, Top to Bottom: Serpentinite, Rhyolite, Basalt, Obsidian, Pegmatite, Granite, Gneiss, Mylonite.
Source: 53v3nfrn5
Special rock formations, just after the Refuge des Mottets.
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two pretty views on gabbro thin section in crossed polarised light
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What do rocks, coral, and trees have in common? Find out with Museum Education Experience Program (MEEP) interns Claire and Fred.
The Museum is looking for fall interns! Applications are open through August 23. Apply now!
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Amethyst Geode Uruguay
Cut and polished on one side to reveal dark purple crystals. 51⁄2 x 91⁄2 x 4in. (14 x 24 x 10cm.).
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First field trip in grad school!!! We went to the Lake Thoreau Environmental Center which is associated with USM in Hattiesburg. I also c imported a goal of mine to meet a cow. His name is Sirloin and he likes pets.
The first two pictures are of the soil moisture (etc) sensors we placed and of a piezometer we added a measuring sensor to in order to track groundwater levels. The third picture is of my advisor standing in front of the artificial Lake Thoreau and the last one is of Sirloin
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Thirlstane Arch Ancient Landscape Feature at Powillimount Beach, Dumfries and Galloway, Scotland
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Vanadinite
⚒ Location: Mibladen, Morocco
📸 More photos: https://minerali.rs/2024/06/17/vanadinite-vanadinit-2/