What directions do geologists use for strike direction in the United States?

• A. SE or SW
• B. N or S
• C. NE or NW
• D. E or W

Answer: (C)

Strike direction is the compass direction of the line formed by bedding as projected on the horizontal plane. In U.S. field practice, geologists typically record strike using quadrant bearings (NE, NW, SE, SW) rather than pure N, S, E, or W. This reflects that bed traces often run diagonally across the map, so describing the strike with a diagonal direction (NE or NW) is standard, with the opposite end of the line understood along the same diagonal (SW or SE). So, the convention emphasizes NE or NW as the principal way to express strike direction in the United States.