Description:
Presented is an excellent example of a fully adult Desmostylus
tusk. It exhibits excellent color and condition with a robust
and impressive presence. The tip is intact. There are some naturally
occurring cracks in the specimen, which are to be expected, the
result of drying and contraction. It sits comfortably in a near
shore matrix coquina, which is largely composed of crushed and
broken fossil seashells.
This
is a rare tusk of Desmostylus hesperus, an extinct placental
mammal from the Middle Miocene Period some 14 - 19 million years
ago. Desmostylus leaves no direct descendents, but is likely an
ancient, genetic cousin to the sea cow and elephant. This specimen
was collected on private land decades ago and only recently became
available from an old collection. As the site is
no longer collectable,
Desmostylus fossils are now very hard to obtain.
Marsh
first described Desmostylus in 1888 from fossils in marine deposits
in Alameda
County, California. Because of their limited
stratigraphic range (Western North America and Japan), the unusual
form of teeth that confounds determining what they ate, and their
apparent combined terrestrial and marine lifestyle, they are
placed in their own Order Desmostyidia within Class Mammalia.
The name Desmostylus derived from Greek means, "linked pillars".
These semi-marine mammals had bodies resembling a hippopotamus,
with four stout legs and four small tusks. They might have paddled
around shallow water crushing shellfish for food with their heavy,
columnar teeth or they may have been herbivores, or omnivores.
Their closest living relatives are the Proboscidea (elephants)
and Sirenia (manatees), such that they belong to the clade Afrotheria.
Desmostylians grew nearly two meters in length and are thought
to have weighed more than 1500 pounds. At the end of October, 2010 I acquired a large percentage of the
Paul Spinner Collection from his fossil estate manager. Paul was
a Native American who worked for the U.S. Forrest Service and lived
in the western side of Kern County, California. During the 1950s
through the early 1980s he accumulated his collection from Fresno
county, the Lompoc area fish beds, Sharktooth Hill bone beds, Kern
county Brea (tar) pits, etc. As his reputation grew for having
the largest privately held and valuable fossil collection from
these areas, he developed a special relationship with the University
of California Santa Barbara department of Paleontology as well
as the La Brea Tar Pits staff. This unique collection of Southern
California fossils was primarily from the Cenozoic, with an emphasis
on the Miocene.
Please keep in mind that this was a unique acquisition. I have
only two tusks and nine teeth specimens. Once they are gone, that
is it, no more will be available.
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