A gravel quarry exploiting the serpentinites of the State-line belt, with chlorite schist of the Wissahickon Formation to the north and west (Precambrian or Early Paleozoic).
Operated by DM Stoltzfuss & Son, under the name "DM Stoltzfus & Son Cedar Hill Quarry", according to Pennsylvania State Department of Environmental Protection. Produced 731,000 tons of material in 2003.
References:
- Rocks & Mins.:60:243.
- Lapham & Geyer, 1965: Mineral Collecting in PA; Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Reed, Juliet C., Min. Soc. of PA, Inc. (1976): 14, 41, 47-48; Lapham, Davis M. & Barnes, John H. (1971), "Unusual Minerals Found in PA," PA Geol., Vol. 2(6):2; Grant, Raymond W. (Feb & Mar 1973) "Revised PA Mineral Lists and Index", PM (122 & 123), Keystone Newsletter; Montgomery (Feb 1966), "Updated List of PA Minerals in PM (38); Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in PA: 50, 81; (1969):52, 87; Montgomery, Arthur (Sep, 1972), "Pennsylvania Minerals (PM), PM(117), Keystone Newsletter.
Mineral List:39 entries listed. 30 valid minerals. 1 type locality (valid mineral).
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