GEOLEX

Summary of Citation: Rich Acres

Publication:
Conley, J.F. and Toewe, E.C., 1968, Geology of the Martinsville
   West quadrangle, Virginia: Virginia Division of Mineral
   Resources Report of Investigations, no. 16, 44 p.

Usage in Publication:
Rich Acres Norite

Modifications:	Geologic Province:	Dominant Lithology:
Named	Piedmont-Blue Ridge province	Norite

Summary:
Rich Acres Norite named for community of Rich Acres, Martinsville West quad, Henry Co., south-central VA. Exposed in several distinct plutons in quad, including type locality at Rich Acres in southeastern part, at and north of Villa Heights in northeastern part, at Collinsville in north-central part, east of Stanleytown in northern part, and in small pluton on tributary of Shelton Branch in southwestern part. Consists of intermediate to dark-greenish gray, porphyritic, nonfoliated, coarse-grained norite. Intrudes sillimanite-mica schist, biotite gneiss, granite gneiss, and Leatherwood Granite. Contact with older rocks is almost a hairline. Age is late Paleozoic. It intrudes late Paleozoic Leatherwood Granite so it is considered slightly younger; zircon correlations indicate that Leatherwood and Rich Acres formed from same parent magma. Report includes geologic map and cross sections.

Summary of Citation: Rich Acres

Publication:
Conley, J.F. and Henika, W.S., 1973, Geology of the Snow Creek,
   Martinsville East, Price, and Spray quadrangles, Virginia:
   Virginia Division of Mineral Resources Report of Investigations,
   no. 33, 71 p.

Usage in Publication:
Rich Acres formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised Redescribed	Piedmont-Blue Ridge province	Norite Gabbro Diorite

Summary:
Significant amounts of gabbro and diorite were found in Rich Acres Norite in this area. Therefore, name is changed to Rich Acres formation.

Summary of Citation: Rich Acres

Publication:
Conley, J.F., 1985, Geology of the southwestern Virginia Piedmont:
   Virginia Division of Mineral Resources Publication, no. 59,
   33 p.

Usage in Publication:
Rich Acres Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised Age modified	Piedmont-Blue Ridge province

Summary:
Martinsville igneous complex includes unnamed norite, Leatherwood Granite, and Rich Acres Formation (base). Age is Ordovician.