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Updated: May 19, 2025
These beds are the equivalents of the white chalk and chalk marl of England, or Senonien of d'Orbigny, although the white siliceous sands of the lower beds, and the green grains in the upper part of the formation, cause it to differ in mineral character from our white chalk. Beds of fine clay, with fossil plants, and with seams of lignite, and even perfect coal, are intercalated.
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