Stop #4: Waynesville and Liberty Formations
The fourth stop was a site the Dry Dredgers visited last in
March 2011. This time, since it was the fourth
site after the picnic at about 3:44 pm, the crowd was thinning. Steve Felton,
however had spent most of the afternoon at this site. We caught up with him
while he was checking a secret spot for his ellusive platycerid gastropods. He
knew we were coming, so he should not have been so surprised.
We didn't see any platycerid gastropods - Naticonema nor Cyclonema. But here's what we did find in the Waynesville and Liberty of stop#4.
Trilobites
There was a good layer for Flexicalymene retrorsa
and Flexicalymene retrorsa minuens in the Liberty
Formation exposure.
The most HUMONGOUS hypostome of an Isotelus was found. It was
just a fragment, but if we had seen the entire trilobite, based on this
fragment, it would have been at least 16 inches! (My own educated opinion).
Cephalopods
Here's a straight-shelled nautiloid cephalopod that is of a
less common genera. I'll have to do some research, but it looks different to me.
(BH)
Corals
Here's a fragment of a horn coral from Stop#4. It is
hard to recognize because you are looking at the internal wall showing the cepta.
This is likely to be Grewingkia canadensis.
Brachiopods
Hebertella sp.
(next 2 pics)
Here's a slab with large quantities of the sowerbyellid
brachiopod Eochonetes clarksvillensis (previously
Eochonetes clarksvillensis).
This site (stop#4), like the others in Brookville, Indiana we
visited, have a wide variety of brachiopods. Many are hard to tell apart. Here
are two similar brachiopods - Plaesiomys
subquadratus (left) and
Glyptorthis insculpta (right).
An extremely common brachiopod found at site#4 was Lepidocyclus perlamellosum. (Next 2 pics).
Good quantities of the brachiopod
Leptaena richmondensis were found.
Plenty of examples of Strophonema sp. were also found.
This one is a little strange to me. It was found at the top of
the cut, in the Liberty formation. I would have to say it's a small Glyptorthis
insculpta. If you think I'm right or wrong, email me at
admin@drydredgers.org. 
Here's a gutter cast that has the negative impressions of some
shelled animal. It was also found near the top of the cut.
Here's yet another example of a bryozoan encrusting a clam and leaving the clam's external shell features on the underside of the bryozoan. In this case, the clam looks like Ambonychia sp. (next 2 pics).
Stop #4 is famous for crinoids. However, we did not find any.
They layers must be covered up. We did find small numbers of crinoid stems. One
is shown below.
That's all for this trip. I hope you enjoyed the report as much as we enjoyed the outing.
Return to the September 2013 Field Trip Home.
See Previous Trips to these sites:
July 2011
March 2011
April 2006
March
2005
April 2003
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