Greywackes in thin section
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September 14, 2021
Greywacke petrography On the outside, greywacke is generally presented in varying shades of grey commonly
Tag: thin sections
Sandstones in thin section
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September 10, 2021
The selection of sandstones in plain polarized light (left) and crossed nicols (right) shown here
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Bounding surfaces in aeolian dunes
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Marie Carmichael Stopes (1880-1958)
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Common aeolian bedforms
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The Bagnold dune field, Gale crater
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