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.
The Caddo Indians were one of the first to appreciate the beauty of this area, for it was here that they made their home. Village sites and burial grounds have been located in numerous places in the county; on Ripley Creek, Harts Creek, Blundell Creek, Swannano Creek, and at Dellwood Park. Titus County was, perhaps, the last home of Indians in the Northeast Texas area, living here as late as 1845.