Example Sentences

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What are known as septarian nodules, or snake-stones, are, at certain places, common in the carboniferous strata.

From The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes by Martin, Edward A.

This recalls the occurrence of fossils in septarian nodules, flints, phosphatic concretions, &c., in the older strata.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" by Various

A little above the oyster bed is a band of hard-bluish septarian limestone.

From The Geological Story of the Isle of Wight by Hughes, J. Cecil

Many shales contain great numbers of ovoid or rounded septarian nodules of clay ironstone.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" by Various