(from the article `Cretaceous Period`) On a more local scale, correlation can be achieved using a variety of fossil groups. Rudist, inoceramid, and exogyrid bivalves have been used in many ... The marine realm can be divided into two paleobiogeographic regions, the Tethyan and the boreal. This division is based on the occurrence of ... ...
Found on
http://www.britannica.com/eb/a-z/r/76
An extinct bivalve mollusk from the Jurassic and Cretaceous that had two different sized and shaped shells; they usually were attached to the substrate and were either solitary or in reeflike masses.
Found on
https://www.encyclo.co.uk/local/21202
No exact match found.
