The Dry Dredgers returned to one of their favorite Indiana sites that exposes much of the Richmondian Stage of the Cincinnatian formations. We go in the spring each year because the trilobites weather out with enough rain and freezing/thawing. We always find a decent number of trilobites on this site.
Fossils Found That Day
Flexicalymene retrorsa minuens
A pygidium of the trilobite Ceraurinus icarus.
Corals were found on this site in two basic forms - solitary and colonial. These
next two pictures show a couple of solitary coral named Grewingkia sp..
Another solitary coral we found was Streptelasma sp.
Shown below, these corals are sometimes found attached to an object or it is
apparent that they were once attached to an object. The picture below is a great
example of the latter. These two Streptelasma sp. are
now attached to each other and open air, where they were probably once attached
to surface of some kind. This is a great specimen!
Here's another fantastic specimen. This brachiopod was PRIME REAL ESTATE for all
kinds of attaching creatures. I see at least 5 Streptelasma sp. horn corals
attached to it plus I see what looks like a couple of inarticulate brachiopods
also attached. Pretty cool.
Now here are some photos of colonial corals.
This first colonial coral is awesome. When first spotted on the ground while the
person is standing or walking by, even an expert would think this is a
crinoid calyx. It has just the right shape! But
on close examination, it's clearly a group of coral.
A much more common variety of colonial coral we found was this encrusting tabulate coral Protaraea richmondensis. (next 2 pics)
Here's another group of colonial coral. I'm not sure of its identity, but it's
interesting how it appears to be mostly below the substrate with the openings
keeping a clear path to the water and food.
Ambonychia sp. (Next 3 pics)
Now here's an interesting bivalve fragment. It's the hinge of what appears to be
Cycloconcha sp. preserved in pyrite. Note the
It was not very hard to find examples of individual valves of the brachiopod
Also abundant were Strophomena sp..
Another common brachiopod we found was
Large numbers of Cincinnatina sp. (formerly
Dalmanella sp and Onniella sp.)
were found particularly in the Waynesville Formation on this site.
Here is an interesting fragment of the brachiopod
Rafinesquina sp. with a couple of worm
tubes, possibly Cornulites sp. attached to it.
There are specific layers on this site where a storm event is apparent by large
numbers of the brachiopod Rafinesquina sp. pushed
close together sideways.
The above squiggle is thought to be a cephalopod surface. A previous example of one found on a Dry Dredgers field trip is from May 2006 and also one seen at the March 2009 meeting. However, I also think this surface resembles the monoplacophoran Phragmolites.
Here is another mystery squiggle. It most closely resembles the bivalve Caritodens.
That's all for this trip.
Now let's see the May 2013 field trip to Mt. Orab, Ohio.
Previous field trips to this Southeast Indiana fossil Mecca.
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