Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals.
Mountrail County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 7,673. Its county seat is Stanley.
Established in 1785, Edgefield County is a part of the Aiken/Augusta metropolitan statistical area. It is located on the Savannah River just north of Augusta and north-west of Aiken County, covering an area of 506 square miles. It has a population of approximately 27,000 (2010 census.). The county has three incorporated municipalities; Edgefield, the County seat, Johnston and Trenton.