Ordovician bivalve

External mold of Ordovician bivalve showing that the original aragonite shell dissolved on the sea floor, leaving a cemented mold for biological encrustation.

Ordovician bivalves
The following 9 pages are in this category, out of 9 total.


 * Cuyopsis
 * Emiliodonta
 * Hemiconcavodonta
 * Praenuculidae
 * Similodonta
 * Solenomorpha
 * Trigonoconcha
 * Villicumia
 * Whiteavesia