\Cau"da gal*li\, . [L., tail of a cock.] (Paleon.)
A plume-shaped fossil, supposed to be a seaweed,
characteristic of the lower Devonian rocks; as, the cauda
galli grit.
{Cauda galli epoch} (Geol.), an epoch at the begining of the
   Devonian age in eastern America, so named from the
   characteristic gritty sandstone marked with impressions of
   {cauda galli}. See the Diagram under {Geology}.