Corundum Hill, Unionville, Newlin Township, Chester Co., Pennsylvania, USA
|Latitude & Longitude (WGS84):||39° 53' 0'' North , 75° 43' 59'' West|
|Latitude & Longitude (decimal):||39.88334,-75.73333|
|Köppen climate type:||Cfa : Humid subtropical climate|
Occurrence in albite-corundum pegmatites.
11 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
252.17 - 541 Ma
|"Glenarm Wissahickon" formation|
Age: Paleozoic (252.17 - 541 Ma)
Stratigraphic Name: Glenarm Group
Comments: Digital map differences from 1980 printed map: name and map symbol changed from (Wissahickon Formation - eastern part) (Xw).
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. 
1000 - 1600 Ma
|Mesoproterozoic crystalline metamorphic rocks|
Age: Mesoproterozoic (1000 - 1600 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.