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curf

curf local.
  (kɜːf)
  Also carf, kerf.
  [var. f. carf, kerf.]
  A cherty limestone found in one of the strata of the Portland beds of stone.

1839 Civil Engin. & Arch. Jrnl. II. 375/2 A middle or curf bed occurs only in the southernmost of the quarries. 1893 Spon's Mechanic's Own Bk. (ed. 4) 564 Then..the Bastard-Roach, Kerf, or Curf is reached. 1936 Discovery Mar. 76/2 Between the ‘Whit Bed’ and ‘Base Bed’ there is an irregular deposit of curf and flint, locally called ‘Pericott’.

Oxford English Dictionary

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