title: Dorsum Guettard
text: # Dorsum Guettard
  
  Dorsum Guettard is a wrinkle-ridge at 10°00′S 18°00′W﻿ / ﻿10.0°S 18.0°W﻿ / -10.0; -18.0 in Mare Cognitum on the Moon. It is 40 km long and was named after French geologist and mineralogist Jean-Étienne Guettard in 1976.
  
  