Coal-measures. The whole group of deposits, consisting chiefly of sands and shales, with which coal is usually found.
Coccosteus. (Gr., berry on bone)—a Ganoid fish.
Coleoptera. Beetles whose wings are covered with a hard sheath.
Columnar. Arranged in columns.
Conchifera. One of the great divisions of Conchology.
Conchoidal. Resembling a shell. Used in Mineralogy to designate a particular kind of fracture.
Condyle. A knob at the end of a bone, a joint.
Conformable. When the planes of bedding of two successive beds or strata are parallel to each other they are said to be conformable; when not parallel they are unconformable.
Congeners. Species belonging to the same genus.
Conglomerate or Puddingstone. A rock made up of rounded water-worn fragments of rock or pebbles cemented together by another mineral substance.