Pinesburg Quarry, Williamsport, Washington Co., Maryland, USA
|Latitude & Longitude (WGS84):||39° 37' 22'' North , 77° 52' 7'' West|
|Latitude & Longitude (decimal):||39.62278,-77.86861|
|Köppen climate type:||Cfa : Humid subtropical climate|
Quarry in Ordovician carbonate sedimentary rocks. Located south of Route 68 (Clear Spring Road) west of Williamsport. Owned by Martin Marietta Corporation.
5 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
443.8 - 485.4 Ma
|Chambersburg Limestone and St. Paul Group (including New Market Limestone and Row Park Limestone)|
Age: Ordovician (443.8 - 485.4 Ma)
Description: Chambersburg Limestone - Dark gray, fine- to medium-grained, thin-bedded argillaceous limestone; nodular and fossiliferous; thickness 225 to 250 feet; and St. Paul Group, including New Market Limestone - Upper part gray, thick-bedded calcilutite; fossiliferous; lower part light gray, thin-bedded, laminated argillaceous calcilutite; thickness 285 feet in south, increases to 700 feet in north; and Row Park Limestone - Light gray, fine-grained, medium- to thick-bedded calcarenite; calcilutite, and dolomitic limestone; interbedded dark gray, cherty, granular limestone; thickness 100 feet in south, increases to 680 feet in north.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.