Argillite is a Greenup county community on the Little Sandy River about six miles south of Greenup. The area was a center of mining and iron production with the first iron furnace in operation in 1815. The locale was known as Argillite Furnace or Trimbles Iron Works. The Eastern Kentucky Railway arrived in 1866 and operated until about 1933. After the decline of the iron industry locally, grist mills and timber production were important. The name Argillite is from a kind of sedimentary rock. The Trimble's Iron Works post office operated from 1828 and 1824. The Argylite post office operated from 1860 to 1861 and reopened as Argillite in 1874.
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