combining form of CRETACEOUS, = ‘cretaceous and ——,’ as in cretaceo-oolitic, cretaceo-tertiary adjs.
1880. Ramsay, in Times, 26 Aug., 5/4. Ordinary volcanic rocks have been ejected in … Cretaceo-Oolitic … times.
1881. Rep. Geol. Explor. N. Zealand, 117. The Cretaceo-Tertiary rocks.
