2. geologic map at a scale 1:250,000 and depicts my synthesis of
the detailed data presented on open file 1:2400 maps
3. THE GEOLOGY OF CHESTER COUNTY, SC.
The area has a long history of sedimentation, tectonism and erosion.
The earliest Proterozoic host amphibolites, gneiss and quartzites are
cut by metagranites (Great Falls), gabbro (Chester), granite.(Lowery)
This synthesis come from study of apx 125 samples 172 thin sections.The 7.5 minute
quadrangles with the number of collected samples are: Lockhart -1, Leeds - 2, Carslile –
2, Carslile SE- 9, Baton Rouge - 3, Chester- 19, Blackstock- 6, Richburg- 11, Stover 11
Catawba 1, Fort Lawn 9,Grea t Falls - 24, Flint Hill 6, Lancaster - 4 Lancaster SE 10
21. Lockhart metadiorite.
Medium- to coarse-grained,
relatively uniform biotite-
hornblende metadiorite, that
locally grades into metagabbro
and metatonalite. Part of a large
pluton that lies mainly in Union
County, South Carolina, in the
vicinity of the city of Lockhart.
35. 1/13/2006 303
9/11/2003 133
Geologic map of the Metagranite
Generalized geologic map of the Great Falls metagranite and surrounding rocks.
Explanation: MGR- Great Falls metagranite, GN -gneiss complex, GB -gabbro,
ƒ- sheared rocks, dd -diabase dikes, M -mafic dike concentration, z -zeolite
mineralization, s - skarn. From Privett, 1984.
