| potsdam group | <geology> A subdivision of the Primordial or Cambrian period in American geology; so named from the sandstone of Potsdam, new York. See Chart of Geology. Source: Websters Dictionary (01 Mar 1998) |
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| potstone | <chemical> A variety of steatite sometimes manufactured into culinary vessels. Source: Websters Dictionary (01 Mar 1998) |