23 cm section of the wood (Callixylon whiteanum) of Archaeopteris, one of the earliest trees. Woodford Shale, Oklahoma, USA.
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Marpolia spissa, 25 mm, Spence Shale Member of the Langston Formation, Utah
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We scrambled up the loose, shale slopes behind Little Egypt to connect with jeep roads
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1 15 24 Jen's mods to Shale's Plan
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091905 shale.jpg
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