Excerpt from Practical Treatise on Limes, Hydraulic Cements, and Mortars: Containing Reports of Numerous Experiments Conducted in New York City, During the Years 1858 to 1861, Inclusive

Group the Chazy, Bird's Eye, Black River, and Tren ton Groups. It is the oldest known fossiliferous limestone, is calcareo-silicious in character, as its name indicates, and is the lowest member of the series capable of yielding either hydraulic lime or cement. In many localities, it exhibits the water-lined laminae of deposition in a marked and conspicuous degree.

Three distinct masses Of this rock are usually Observed wherever it presents a fully developed outcrop.

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