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Updated: August 2, 2026
The conchiferous calcareous beds at Coquimbo, and at a few isolated points northward, offer the most marked exception to this statement; for these beds are from twenty to thirty feet in thickness, and they stretch for some miles along shore, attaining, however, only a very trifling breadth.
On the causes of the absence of recent conchiferous deposits on the coast of S. America. On the contemporaneous deposition and preservation of sedimentary formations. I can add little to the details given by M. d'Orbigny on the sandstone formation of this district.
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