Field Notes in Delaware County: With a Colored Geological Map of the County, and Thirty-Nine Photographic Pictures of the Granite Quarries, the Kaolin Mines, the Serpentine Outcrops, and the Castle Rocks (Classic Reprint)

Excerpt from Field Notes in Delaware County: With a Colored Geological Map of the County, and Thirty-Nine Photographic Pictures of the Granite Quarries, the Kaolin Mines, the Serpentine Outcrops, and the Castle Rocks

Sir: I have the honor to submit the report made to me in 1880 by Mr. Chas. E. Hall on the results of his long con tinned and careful study of the geology of Delaware county; with a geological map of the county, colored by himself, to Show the areas occupied by the older and newer gneiss for mations respectively the belt of quaternary sands and clays stretching along the Delaware river the most notable patches of Bryn Mawr gravel left upon the upland and all the outcrops of serpentine which he could find, or clearly distinguish in the county.

This report, which consists wholly and simply of a care fully classified and verified geographical list of the exposures which he studied in all parts of the county, arranged in the order of townships, with lists of all the known species of minerals seen by him in place, or existing in the collections of the Survey, and in the museums of private individuals, I have hitherto withheld, with a view to such further special local geological field work, in various parts of the county, as seem to me to be necessary, in addition to his, data for writ ing out a complete geological report on Delaware county.

A certain amount of such additional field work has been done, but not enough to enable me to write a report on the county which would be satisfactory to myself or to others.

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