"Richard Norman" <
r_s_n...@comcast.net> wrote in message
news:p46d791muve868f15...@4ax.com...
> Do you have a reliable source for a seahorse that lives in Lake
> Titicaca? I don't mean a dried specimen that could have come from the
> ocean or a fossil.
I know nothing about possible seahorses in Lake Titicaca (good for them if
they can survive there is pretty much my conclusion), but I can tell you
about a most curious coprolitic coincidence, indeed, involving the famed
South American body of water.
The plot thickens: There's a geologic rock formation on California's Mojave
Desert called the Barstow Formation. It's roughly 19 to 13 million years
old, dated pretty accurately through rigorous sophisticated radiometric
isotope calculations conducted on several inlayered accumulations of tuff
(hardened volcanic ash-sludge).
The Barstow Formation yields loads of fossils--lots of extinct, now
mineralized mammalian skeletal elements, for example. It also contains
abundant silicified insects, arachnids, and crustaceans that can be freed
whole and intact, in fully three-dimensional form, from calcareous
concretions that occur rather commonly in specific phases of sedimentary
deposition some 17 million years old.
One particular obvious evidence of arthropod activity approximately 17
million years ago, recovered from the insoluble residues of Barstow
Formation concretions run through a diluted solution of either formic,
acetic, or muriatic (commercial-grade hydrochloric) acids, includes abundant
excellently preserved coprolites from a species of fairy shrimp whose
closest living relative now inhabits the Lake Titicaca area.
Mojave Desert fairy shrimp coprolites coincidentally in common with current
crustacean defecations at Lake Titicaca (with scatatological emphasis on the
"caca" part, naturally)? You just can't make this stuff (crap?) up.
More information regarding the overall paleontology and general geology of
the middle Miocene Barstow Formation can be found at my page--"Fossil
Insects And Vertebrates On The Mojave Desert, California"
http://inyo.coffeecup.com/site/barstowfossils/barstowfossils.html .