rimrock

[ rim-rok ]
/ ˈrɪmˌrɒk /

noun Geology.

rock forming the natural boundary of a plateau or other rise.
bedrock forming the natural boundary of a placer or of a gravel deposit.

Origin of rimrock

An Americanism dating back to 1855–60; rim + rock1

Words nearby rimrock

Example sentences from the Web for rimrock

  • On either side were brownish red jagged peaks and rimrock faces, specked with snow.

    Pluck on the Long Trail |Edwin L. Sabin
  • The rimrock and the gravels above and below it constitute the Rattlesnake Formation.

  • We followed along the ledge around the rimrock until we came to a little pass through.

    Pluck on the Long Trail |Edwin L. Sabin
  • One after another they leaped over the edge of the rimrock until most of the flock was destroyed.

    The Story of Wool |Sara Ware Bassett

British Dictionary definitions for rimrock

rimrock
/ (ˈrɪmˌrɒk) /

noun

rock forming the boundaries of a sandy or gravelly alluvial deposit