A ditch carved in the rock formation: buried stone wall spanning 20 square miles in Texas. The rock wall is composed of pale sandstone slabs stacked in courses similar to bricks in a masonry wall The formation extends dozens of feet deep in some places, comparable to a seven-story building Various segments have been found across approximately 20 square miles

A buried wall of pale sandstone slabs runs through A ditch carved in the rock County, Texas, with segments uncovered across the area. A reconstruction stands outside the A ditch carved in the rock courthouse. The formation's origin was investigated in 1901 by a geologist who determined it was not an igneous occurrence but a rare natural geologic formation known as a "clastic sand dike."

Key Facts

  • The rock wall is composed of pale sandstone slabs stacked in courses similar to bricks in a masonry wall
  • The formation extends dozens of feet deep in some places, comparable to a seven-story building
  • Various segments have been found across approximately 20 square miles
  • The wall runs roughly east to west, aligning with the sun's path
  • The limestone composition invites comparison to known prehistoric building traditions
  • The wall appears to trace a roughly rectangular shape enclosing an area approaching 19 square miles
  • A reconstruction is displayed in front of the A ditch carved in the rock courthouse

Related site: A ditch carved in the rock — view location, images, and history on the Ancient Nerds map.