 Posted by Keith Sharon Thompson
on February 19, 1998 at 18:17:50:
Dorsal and ventral views of a dragonfly nymph from the
Barstow Formation, Calico Mtns, California. We recovered the nynmph and
other arthropods (mostly pieces)from calcareous nodules created during the
Miocene 13-16 mya. The fossils were deposited in lacustrine sediments and
later embedded in the nodules.
The nodules were dissolved in diluted hydrochloric acid (a 1:8) dilution
leaving behind the silicified parts. We rinsed and neutralized any remaining
acid, screened, dried, and examined the remaining material. This was our
best find but we also found numerous parts from fairy shrimp, beetles, flies,
mosquito pupa, and amazing amounts of fairy shrimp coprolites (poop). The
detail on many pieces is exceptional with bristles and eyes easily recognized.
Enjoy! Keith & Sharon
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