Labeceras sp
Class Cephalopoda, Order Ammonoidea
Geological Time: Early Cretaceous
Size (25.4mm=1 inch): Primary specimen 40 mm on a 70 x 70 mm matrix base
Fossil Site: Walsh River, Queensland, Australia
Fossil Code: PFO166
Price: $200.00
 Description:
An excellent example of this classic Australian uncoiled (heteromorph)
ammonite. The specimen retains much of it’s calcite exoskeleton.Note
the small nodes along both sides of the keel. Such ammonites are perhaps
one of the most aesthetically pleasing of all cephalopods.
While
most ammonites have spiral shells that retain the same shape throughout
growth (homomorph), the major group of Ancyloceratina, that appeared
during the Late Jurassic had these uncoiled shells instead, and
were called heteromorph ammonites (meaning, different-shaped). |
