Douvilleiceras mammilatum
Order Ammonoidea
Geological Time: Upper Early Cretaceous, Albian Stage
Size (25.4 mm = 1 inch): Ammonite fossil is 35 mm across
Fossil Site: Tulear, Madagascar
Fossil Code: 2986
Price: $55.00
 Description:
This spectacular ammonite is a Douvilleiceras mammillatum from
Madagascar which has been polished to show the wonderful amber
Calcite just below the outer shell The intricate suturing pattern
which provided strength to the ammonite is well evident. Note
as well the linear structure evident at the midline. This is
the siphuncule, an integral part of the ammonite’s “ballast
system”. The ammonite moved freely at depth by pumping
water in an out by means of the siphuncule. There is a small
amount of residual pearlescent shell remaing on the reverse.
It is a stunning example of an ammonite from the Albian (112
m.y.a) deposits of Madagascar, one that is sure to be the centerpiece
of any ammonite collection. |
