アメリカ自然史博物館のインスタグラム(amnh) - 6月21日 08時05分

It's Trilobite Tuesday! Soon after the fall of communism in the late-1980s, a veritable onslaught of trilobite specimens began to emanate out of the Wolchow River region near St. Petersburg, Russia, and onto world stage. The preponderance of this material was being drawn from a series of geological layers collectively known as the Asery Horizon which had formed 450 million years ago when this area of Europe was still covered by a warm inland sea.
These Ordovician-age trilobites were noteworthy for their thick, caramel-colored calcite shells as well as their exceptionally three-dimensional preservation. Some specimens featured exotic shapes and sizes while others presented carapaces covered by an array of pointed spines. Equally as impressive, many of the over 100 trilobite species that have so far been discovered and described from this horizon had previously been unseen by the scientific community… at least at this level of completeness.
By the mid-'90s, these magnificent arthropods were being exhibited in museums, with one in particular-- Neoasaphus kowalewski-- drawing particular attention due to the fact that it featured eyes sitting atop stalks over two inches long. #trilobitetuesday #trilobite #trilobites #amnh #naturalhistory #fossils #fossil #stpetersburg #russia_in_nature

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