- O. (O.) rivierense, O. (O.) reynesi, O. (O.)
authelini and O. (O.)
subcostulatum.
Juvenile stage of O. (Pseudopolyplectus) is sp****ly
ribbed by sigmoid...
-
coloradoensis †Antiquatonia portlocki**** †Aphetoceras †Aphetoceras
subcostulatum †Aphlebia †Apiculatasporites †Apiculatasporites
latigranifer †Apiculatasporites...