california academy of sciences geology:
Actinodiscus californicus
california academy of sciences geology:
Biddulphia petrolia
california academy of sciences geology:
Dicladia trinodis
california academy of sciences geology:
Liradiscus circularis
california academy of sciences geology:
Melosira caliginosa
california academy of sciences geology:
Melosira lolia
california academy of sciences geology:
Melosira lolia
california academy of sciences geology:
Melosira lolia
california academy of sciences geology:
Navicula tolmani
california academy of sciences geology:
Omphalotheca californica
california academy of sciences geology:
Plagiogramma marginatus
california academy of sciences geology:
Stictodiscus coalingensis
california academy of sciences geology:
Trochosira trochlea
california academy of sciences geology:
Xanthiopyxis specticularis