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Updated: June 14, 2025
When I was on the spot the former appeared to me to have some analogy with zechstein, or Alpine limestone; the latter with Jura limestone; I even thought that the granular gypsum of Guire might be that which belongs in Europe to zechstein, or is placed between zechstein and variegated sandstone.
The formation was well studied by the miners of that country a century ago as containing a thin band of dark-coloured cupriferous shale, characterised at Mansfield in Thuringia by numerous fossil fish. To the limestone they gave the name of Zechstein, and to the marl-slate that of Mergel-schiefer or Kupfer- schiefer.
The two limestone strata of Cumanacoa and Caripe succeed immediately each other, like Alpine and Jura limestone, on the western declivity of the Mexican table-land, between Sopilote, Mescala and Tehuilotepec. These formations, perhaps, pass from one to the other, so that the latter may be only an upper shelf of zechstein.
How can we in many circumstances determine the analogy existing between a limestone with but few petrifactions and an intermediary limestone and zechstein, or between a sandstone superposed on a primitive rock and a variegated sandstone and quadersandstein, or finally, between muriatiferous clay and the red marl of England, or the gem-salt of the tertiary strata of Italy?
Thickness of calcareous and sedimentary Rocks in North of England. Upper, Middle, and Lower Permian. Marine Shells and Corals of the English Magnesian Limestone. Reptiles and Fish of Permian Marl-slate. Foot-prints of Reptiles. Angular Breccias in Lower Permian. Permian Rocks of the Continent. Zechstein and Rothliegendes of Thuringia. Permian Flora. Its generic Affinity to the Carboniferous.
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