アメリカ自然史博物館のインスタグラム(amnh) - 11月8日 23時53分

It's time for #TrilobiteTuesday! Rich sedimentary formations of Silurian age remain among the rarities of the fossil record. For trilobite enthusiasts, such well-known locales as Wren's Nest, England and Rochester Shale, New York, stand among the premier Silurian sites on the planet. Another, perhaps lesser known US locality is the Waldron Shale of Indiana, where beautifully preserved 425 million year old examples of such unusual trilobite species as Metopolichas breviceps (photo), Glyptambon verrucosus and Trimerus delphinocephalus have been found in a number of outcrops that dot the state's southern half. Perhaps closest in its faunal content to the Rochester Shale, there are still marked differences in the material found in the slightly younger strata of the Waldron, and the density of fossilized material also appears to be less prevalent than in the New York locale. Because of their rarity, distinctly mottled caramel color and three-dimensional preservation, Waldron trilobites rank as particularly prized fossils by collectors both near-and-far.

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