Lagerstatt
is a German word meaning "resting place". It has
been recently co-opted by paleontologists to have a meaning
more like "universal graveyard". A largerstatt
is a spectacular rarity, with only a few dozen scattered
about the earth. Another is Solnhofen,
famous for its primitive bird Archaeopteryx, where much
the life of the Jurassic
at that time is preserved in its lithographic limestone.
Another lagerstatt preserving the Eocene
of Germany is Messel,
in which a diversity of life forms has been preserved in
an oil shale. Another geologically more recent deposit is
the tar pits of Rancho La Brea in Los Angeles, showing us
what life was like in the Pleistocene,
a mere 10,000 years ago. Oil shale deposits in Wyoming show
the wide variety of Fish of the Green
River Eocene.
The Burgess Shale deposits of Canada show us what life was
like at the beginning of an explosive radiation of diversity
over a half billion years ago. The one that has been most
in the news of late are the Late
Jurassic/Early Cretaceous deposits of Liaoning
Province in China, home of the fantastic "feathered
dinosaurs".
Taking
its rightful place with all of these is the sublithographic
limestone deposits of Sahel Alma, Hajoula and Haqel, Lebanon
of the Cenomanian Stage of the Middle Cretaceous
(93-97 million years ago). These deposits are most famous
for their exquisitely-preserved fish, but also yield a diversity
of other well-preserved fossils, particularly invertebrates
such as shrimp and lobsters. The deposits are indicative
of a warm and shallow sea that was made up of small basins
only a few hundred meters across. These deposits now rest
some 270 meters below the current surface. Geologists now
believe these basins had their origins at the intersection
of block fault systems. The Baensch Fossil Atlas lists over
70 genera of fish found within these deposits, most all
of which are known from unparalleled-quality specimens preserved
in remarkable detail. While younger than Solhnofen, the
Lebanese sublithographic limestone yileds fossils of equivalent
preservation.