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obolite

obolite Palæont.
  (ˈɒbəlaɪt)
  [f. L. obol-us + -ite.]
  A fossil shell of the genus Obolus. obolite-grit, a name for the Silurian formation containing these.

1859 Owen in Encycl. Brit. (ed. 8) XVII. 105/1 Obolite grit. 1865 Page Handbk. Geol. Terms, Obolus, a genus of bivalves belonging to the Lingula family, and characterised by their orbicular, smooth, calcareo-corneous, sub-equivalve shells... There are several species occurring in the Silurians of Northern Europe; hence the ‘obolite grit’ of Sweden and Russia.

Oxford English Dictionary

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