stringer sand
n.— «After drilling to 14,280 feet, we reached what is known as a stringer sand as well as a drilling break. A stringer sand is one that has evidence of oil in the sand. A “drilling break” is defined as encountering “reservoir quality sand” and pressure, in this case, gas was entering the well bore.» —“Matrixx to Acquire an Additional Interest in the Clovelly Prospect” in Los Angeles, California Market Wire May 21, 2007. (source: Double-Tongued Dictionary)