MASS DEATH ASSEMBLAGE OF GOLD PYRITE HILDOCERAS, DACTYLIOCERAS AMMONITES
AND BIVALVES ON BLACK HOLZMADEN SHALE
Holzmaden Black Shale Formation (Lias Epsilon) - Stuttgart, Germany
PERIOD: 200 million years ago
world-renown Black Jurassic oil-bearing shale of Holzmaden, Germany
comes this exquisitely preserved MASS DEATH ASSEMBLAGE fossil shale slab
featuring a large, fine grade
Hildoceras ammonite with a thick mass mortality layer of
Dactylioceras ammonites. There are even bivalve fossils on the
slab, as well. Holzmaden is a highly
unique formation famous for producing some of the world's finest
Jurassic marine life fossils. Modern quarry efforts have failed to
produce many specimens like this that were once found in greater
frequency many years ago. If you wish to accent a room with one
of nature's most beautiful prehistoric masterpieces, then this fossil
would really set off any interior. The ammonites display an
original shell that the fossilization process has naturally replaced
with stunning golden pyrite - a feature that is so HIGHLY-prized.
tone on the fossil is COMPLETELY GENUINE AND NATURAL
formed millions of years ago.
No doubt, this is a GRADE 10 specimen in every way! The layer that
this fossil slab is on indicates a catastrophic event that resulted in
the death of a large number of ammonites together and at once. The
ammonites possess exquisite chamber ridge detail much better than the
above photos indicate. This wonderful shale specimen would be
truly impressive to display. This beauty has
NO RESTORATION OR
magnificent specimen is not only valuable for its superb fossil quality
and preservation but it possesses immense architectural
value when used in any interior setting. Much nicer in person than
the largest dinosaurs that ever walked the earth were in existence when
these ammonites swam in the ancient seas alongside massive plesiosaurs and
are extinct members of the Cephalopod class.
Modern members include nautilus, squid and octopus.
They first appeared during the Silurian Period (435 million to
410 million years ago) and were abundant and widespread in the seas of
the Jurassic and Cretaceous periods (175 million to 65 million years
ago). Ammonites are important index
fossils—that is, they often link the rock layer in which they
are found to specific geological time periods.
Ammonites varied greatly in size.
as 2 cm (0.75 in) in diameter. During the Jurassic and Cretaceous
periods, ammonites evolved more streamlined shells for swimming and the
structure of the shell became stronger. Different shell shapes emerged
as well, such as snail-like or uncoiled.
The shells of
had hollow chambers separated by walls called septa. A tube called the siphuncle, connected the body with the
chambers allowing the animal to fill them with water or air, changing
its buoyancy in order to
rise or drop in the ocean.
the last and largest chamber was occupied by the living animal.
probably lived for one to six years, with the majority living two to
four years. They fed on plankton (tiny free-floating organisms), sea
lilies, and smaller
orthoceras. Although many fed off the ocean floor, others may have
caught plankton while floating or swimming via jet propulsion,
expelling water through a funnel-like opening to propel themselves in
the opposite direction.
Because ammonites lived
exclusively in marine environments, their presence also indicates the
location of prehistoric seas.
DISPLAY FOSSIL OF JURASSIC AMMONITES PRESERVED IN
NATURAL GOLDEN PYRITE ON BLACK SHALE!
x 10" overall, ammonite is 5.5" across
Item - One Only
Comes with a certificate of authenticity / information sheet.