Extraordinary opal fossils ! Description
This are nearly flawless semi black opal fossils,which can only be appreciated from an ''intellectual,'' the one who knows, collector' s items & rare investment upportunities,
& the uniqueness of ???,000,000 years old nature' s
creations. Name : Belemnites, marine deposits of the Jurassic & Cretaceous periods. Order : Belemnoidea. Class : Cephalopoda.
MOLLASCS.
Mollascs first appeared during the ordovician period, nearly 500 million years ago, & they are still prodigiously numerous
throughout the world, living in the oceans, in fresh water &
on land. At Lightning Ridge, apart from plant pieces, the most
common fossils are pelecypod bivalves, the shells of mussels &
clams. The term 'pelecypod' refers to the hatchet shape of the muscular foot of these animals. The L. Ridge bivalves are unlike those of the other Australian opal fields, & there are at least nine different species, only a few of which have been
studied.
The life habits of these mussels & shells ar unknown, but it is suspected that most of them are freshwater species. Suble differences in shape and patterning may be ontogenic (that is, the result of growth ), or due to wear, erosion and the vagaries
of preservation.
There are three or four common species & others that are infrequent, some represented by single specimens. Opal miners tell of ' shell beds' where dozens of mussels have been
found packed closely together.
From rainbow fossils, part description. Copyright 1995 by N. J. Sofialakis.
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