Check out this slice of Edinburgh’s history! This thin section shows Gullane Sandstone from Craigleith quarries, which supplied stone for Edinburgh Castle and New Town. Captured in polarised light, this well-sorted quartz-arenite is 72% quartz, with traces of feldspar, mica, and tourmaline 💎 | British Geological Survey
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Under the microscope, Caithness Flagstone reveals its finely layered structure, with low porosity and minimal water flow. Formed around 390 million years ago during the Devonian Period, when Scotland was near the Equator, it consists of mud and fine sand deposited in the Orcadian Basin. Tightly packed, it has been used for centuries in masonry, paving, and roofing, becoming a key part of Caithness' construction heritage. | British Geological Survey
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How on Earth do mountains form? ⛰️ Using our mountain building experiment, BGS’ Teddy Reeves demonstrates how tectonic plates fold, fault and uplift rock to create towering peaks. Watch the full experiment: https://youtu.be/mBduxHPCcfI | British Geological Survey
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