Snail 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.