North Island Explorer: Guide to North Vancouver Island






Cretaceous Bivalve: Inoceramus


Cretaceous Bivalve:



Photo 1: Inoceramus.

Inoceramus is an extinct genus of pelecypod bivalves that is extremely common fossil in Vancouver Island Cretaceous shales. Inoceramus grew to large size. Specimens greater than 1 meter have been found.




Photo 2: Palisade-like cross section of Inoceramus.

Inoceramus is most often found as a cross section of its shell. This cross section resembles a palisade and is made of calcite fibres. These cross sections are up to 1 cm thick and are found almost anywhere that Cretaceous shales are found. Not many people collect this bivalve, partly because it is hard to find a complete specimen (and when you do it will be too heavy to carry!). However, it does serve as a good marker. If you find this crystal palisade, you know you are at Cretaceous and you may possibly find other fossils (more often than not more Inoceramus!).









Inoceramus vancouverensis: Cretaceous fossil bivalve.

 Sample of Inoceramus showing crossection of shell.

































Other Vancouver Island Cretaceous Fossils:

Crustaceans: Linuparus (Spiny Lobster), Longusorbis (Crab)

Ammonites: Hauericeras, Polyptychoceras

Bivalves: Inoceramus, Sphenoceramus

Gastropods: Capulus (Elf Cap Snail)