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Oxytropidoceras posted a topic in Fossil NewsSnail fossils reveal origin of rocks used to carve ancient Spanish monuments. The snails trapped in the monument stone are 85 million years old. By Brooks Hays, UPI, Aug. 3, 2017 https://www.upi.com/Science_News/2017/08/03/Snail-fossils-reveal-origin-of-rocks-used-to-carve-ancient-Spanish-monuments/9001501769546/ The paper is: Freire-Lista, D.m., and R. Fort, 2017, Historical Quarries, Decay and Petrophysical Properties of Carbonate Stones Used in the Historical Center of Madrid (Spain) AIMS Geosciences, 2017, 3(2): 284-303. doi: 10.3934/geosci.2017.2.284. http://www.aimspress.com/article/10.3934/geosci.2017.2.284 PDF file at: https://cronicaglobal.elespanol.com/uploads/s1/52/76/85/Carbonate stones Madrid.pdf Yours, Paul H.