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Hello, everyone! I recently collected at a site in Warren County, at an exposure of Venango Formation (L. Devonian, ~363 ma) Riceville Formation (L. Dev. ~359 ma) Shenango Formation (E. Mississippian, ~357 ma) and potentially Chadakoin Formation (L. Dev. 365 ma). The Venango and the Chadakoin are hard to differentiate in that area. I found plants from the Shenango and numerous brachiopods, a bivalve, and worm traces from the Venango and possibly the Chadakoin. Here's another mystery. In observing the fossil, it seems like a xiphosuran, perhaps Patesia randalli (Bicknell and Smith, 2021), which is recorded from both the Venango and Chadakoin. Patesia was formerly referred to as "Kasibelinurus" randalli and "Bellinurus" alleganyensis. But any information or insight is appreciated!

These are some of my favourite Horseshoe crabs i have collected from the two opencasts in Derbyshire UK.that i have hunted in over the years. (some are in negative form) they range in size from 10mm to 40mm. Thank- you for looking at many years and hours of collecting. John

There are currently 3 recognized species of horseshoe crab known from the Mazon Creek deposit. Of these 3, Liomesaspis is the rarest. They are only known from the Braidwood (non marine) portion of the deposit. The most defining feature is the bulbous cardiac lobe. The few specimens that I have seen are often poorly preserved.

Study confirms horseshoe crabs are really relatives of spiders, scorpions March 9, 2019 by Kelly April Tyrrell, University of Wisconsin-Madison https://phys.org/news/2019-03-horseshoe-crabs-relatives-spiders-scorpions.html Ballesteros, J.A. and Sharma, P.P., 2019. A Critical Appraisal of the Placement of Xiphosura (Chelicerata) with Account of Known Sources of Phylogenetic Error. Systematic Biology. https://academic.oup.com/sysbio/advance-article/doi/10.1093/sysbio/syz011/5319972 An unrelated article for cat fans is: Scientists have finally discovered what makes celebrity cat Lil Bub so 'magical' It took an international team of geneticists to crack the code of this cat's mystique. by Karin Brulliard, The Washington Post, INFORUM https://www.inforum.com/entertainment/981309-Scientists-have-finally-discovered-what-makes-celebrity-cat-Lil-Bub-so-magical https://www.grandforksherald.com/entertainment/news/4579948-scientists-have-finally-discovered-what-makes-celebrity-cat-lil-bub-so https://phys.org/news/2019-03-reveals-genome-celebrity-cat-lil.html The paper is: Mike Bridavsky et al. Crowdfunded whole-genome sequencing of the celebrity cat Lil BUB identifies causal mutations for her osteopetrosis and polydactyly, (2019). DOI: 10.1101/556761 https://www.biorxiv.org/content/10.1101/556761v1 Yours, Paul