Description SIZE: 40-60mm (Range) All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity! Type: Rastellum oyster bivalve (fossil Alien) Age: Cretaceous Location: Marovoay, Mahajanga district, Madagascar More commonly known as ‘Fossil Alien’s these amazing bivalves are actually oyster shells. Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) – they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Polished SIMILAR TO SEEN: The image shows an example of the single specimen you will receive. This will be picked from our stock box graded and with a size within the minimum and maximum size range indicated. It will not be the exact specimen in the photo, the colours, shape, size and style may vary as with any natural item.
