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File:Drepanura premesnili fossil trilobite tails in fossiliferous limestone (Kushan Formation, ~uppermost Middle Cambrian; Shandong Province, northeastern China) 3 (15077081657).jpg

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Drepanura premesnili trilobite pygidia in fossiliferous limestone ("batstone") from the Cambrian of China (public display, Nanjing Institute of Geology and Palaeontology, Nanjing, China).

Many thousands of species of trilobites have been described in the paleontological literature. Species were first named & described starting in the late 1760s, but trilobites were discussed in the literature long before this.

The oldest known reference to trilobite fossils in the literature is a 4th century A.D. Chinese book by Guo Po (276-324 A.D.). This book mentions trilobite-bearing fossiliferous limestones that have been called “batstones” by the Chinese for many centuries.

This is a slab of trilobite pygidia (tails) in fossiliferous limestone from the Kushan Formation (~uppermost Middle Cambrian) of Shandong Province, northeastern China (original from Chang, 1921). Kushan limestones contain a relatively diverse trilobite fauna. The most distinctive trilobite in Kushan rocks is Drepanura premesnili Bergeron, 1899 (Arthropoda, Trilobita, Polymerida, Damesellidae). The pygidia of Drepanura have strikingly large anterolateral spines. When portions of the pygidia are covered in matrix, these Drepanura tails resemble flying bats - hence “batstones”.
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Source Drepanura premesnili fossil trilobite tails in fossiliferous limestone (Kushan Formation, ~uppermost Middle Cambrian; Shandong Province, northeastern China) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15077081657. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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current18:55, 6 May 2015Thumbnail for version as of 18:55, 6 May 20151,117 × 960 (1.13 MB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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