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I am very intrigued by this critter being currenty offered fo sale. It seems pretty obvious to me that the rock it is sitting on has nothing to do with the original matrix (and indeed, the seller's text does not mention thr world "matrix" at all). But then, if the fossil has just been glued onto an appropriately shaped rock, how was it prepped to start with? Is it possible for crabs to get fossilised into such a soft matrix, that is it then possible to "free" the entire fossil completely intact, with all its legs, sort of Michelangelo's style (*)? And in any case, what technology and tools could produce such a result? (*) Michelangelo maintained that the subjects for his sculptures were already present inside their marmor blocks even before he started working. on them. All he had to do, was to remove the superfluous material.
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In Pennsylvania USA, in the Old Port Formation, some trilobites are exposed in the scree and talus below coarse sandstone horizons. They tend to be very fragile (image below). My question is..... what's the best way to open large hunks of this rock, hoping for intact fossils within? I'm thinking about trying freeze thaw, but opted to check in here for alternatives or helpful tips. Anyone? Thanks!
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Given a sample of sandstone that appears uniform to the naked eye, how can one determine where the bedding planes are? Are there magnification/chemical or other tricks in our tool box?
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Corbacho, J. and Sendino, C., 2012. Fossil fakes and their recognition. Deposits Magazine, 30, pp.35-40. https://www.researchgate.net/publication/265208436_Fossil_fakes_and_their_recognition https://www.researchgate.net/publication/320686323_Fossil_fakes_and_their_recognition https://www.researchgate.net/profile/Joan_Corbacho Corbacho, J., I. Corbacho, S. Morrison, and M. Valent, 2015,. Latest techniques detected in the falsification of fossils. Batallería. vol. 22, https://www.researchgate.net/publication/284737545_Latest_techniques_detected_in_the_falsification_of_fossils Corbacho, J., Morrison, S., Llácer, S., and K. Hammond 2019, Use of CT Scanning and Radiography as Legal Expert Evidence in Paleontology (Trilobites of Morocco) American Journal of Life Sciences, 7(2), pp. 47-53 https://www.researchgate.net/publication/335176218_Use_of_CT_Scanning_and_Radiography_as_Legal_Expert_Evidence_in_Paleontology_Trilobites_of_Morocco https://www.researchgate.net/profile/Joan_Corbacho https://www.semanticscholar.org/paper/Use-of-CT-Scanning-and-Radiography-as-Legal-Expert-Corbacho-Morrison/63ac6432f865ccfa55d63a9ed97ef5dcde31607c Corbacho, J., 2019. Legal expert in paleontology: a new profession. trilobite Papers, 21, February. https://www.researchgate.net/publication/331260703_Legal_expert_in_paleontology_a_new_profession http://paleonet.org/TTP/TTP21.pdf Corbacho, J., Sendino, C. and Tahiri, M., 2011. Palaeontological fakes. Batalleria, 16, pp.37-45. https://www.researchgate.net/publication/265168169_Palaeontological_fakes_Falsificaciones_paleontologicas https://www.researchgate.net/profile/Joan_Corbacho Corbacho, J., Adserà, P. and de Barcelona, M.G.D.S., 2017. Sobre unas falsificaciones de fósiles de Tailandia. Batalleria (Barcelona): revista de paleontología, (24), pp.13-15. https://www.researchgate.net/publication/316669424_Sobre_unas_falsificaciones_de_fosiles_de_Tailandia Corbacho, J., Vela, J.A. and Cuevas, J.A., 2007. Falsificación de trilobites del norte de África. Batalleria, 13, pp.29-36. https://www.researchgate.net/publication/265168347_FALSIFICACION_DE_TRILOBITES_DEL_NORTE_DE_AFRICA Corbacho, J., 2008. Falsificación de fósiles del N. de África (no trilobites). Batalleria (Barcelona): revista de paleontología, (14), pp.49-56. https://www.researchgate.net/publication/265168516_FALSIFICACION_DE_FOSILES_DEL_N_DE_AFRICA_NO_TRILOBITES Corbacho, J., Corbacho, I., Morrison, S. and Valent, M., 2015. Últimas técnicas detectadas en la falsificación de fósiles. Batalleria, 22, pp.22-27. https://www.researchgate.net/publication/280938775_Ultimas_tecnicas_detectadas_en_la_falsificacion_de_fosiles A related web page. Avilés, J. 2017. To Identify Fossil Fakes: What You Need To Know: https://www.jurassic- dreams.com/pages/free-guide-how-to- identify-fossil-fakes-what- you-need-to-know Finally, a paper about authentic trilobite fossils. Giant Trilobites from Lower Ordovician of Morocco https://www.researchgate.net/publication/265168252_Giant_Trilobites_from_Lower_Ordovician_of_Morocco https://www.researchgate.net/profile/Joan_Corbacho Yours, Paul H.