'Pentamerus limestone' definitions:

Definition of 'Pentamerus limestone'

From: GCIDE
  • Pentamerus \Pen*tam"e*rus\, n. [NL. See Pentamerous.] (Paleon.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. [1913 Webster]
  • Pentamerus limestone (Geol.), a Silurian limestone composed largely of the shells of Pentamerus. [1913 Webster]