Dry Dredgers Field Trip
Saturday, October 26, 2019
Southeastern Indiana Maysvillian Road Cut
Fairview Formation

Photos by Bill Heimbrock

For the October field trip, the Dry Dredgers went to the big road cut in southern Indiana which exposes the entire Fairview formation. We last visited this site in May 2015.

It was a medium rain until noon. Everyone collected fossils in the rain. We found some nice fossils, including some nice cephalopods. Perhaps the real story is that 9 people came to this field trip despite the fact that it was raining since dawn and forecasted to get up to 2 inches. The attending, which included new members, were not willing to give up the last fossil hunt of 2019 because of a little rain. One member drove down from Columbus. My highest commendations go out to these intrepid Dry Dredgers!

Fossils Found That Day

Cephalopods

Here’s a nice find. This straight-shelled nautiloid had the orthocone chambers preserved in brown calcite with the siphuncle visible. The shell was encrusted with the interesting bryozoan, Spatiopora sp.

The wet conditions allowed the brownish color of the calcite to stand out against the grew shale. Here are some of the other cephalopods found.

One member saw a cephalopod on the edge of a slab and was able to pry the layer open with his geology hammer. (next 2 pics)

Bryozoans

We found some nice Constellaria sp. colonies. These are bryozoans with star-shaped monticules. (next 2 pics)

At road level, most of the slabs we saw were nearly covered in a variety of bryozoan shapes and sizes. (next 6 pics).

Bivalves (clams)

Bivalves were also found. Here's a nice internal mold on the surface of a rock with black and brown coloring that might have microstructure from the original shell.

Crinoids

We didn't find any crinoid calyxes (heads). But we did find plenty of slabs that were loaded with stems and individual stem columnals.

Gastropods

Snails were not the most common fossils on this site, but enough to represent the common species.

This first one is a gastropod called Cyclonema.

Here is an internal mold of Paupospira sp.

Brachiopods

As is true for most Cincinnati area sites, there were many varieties of brachiopods. This first one very tiny but extremely abundant. It's Zygospira cincinnatiensis.

In certain layers, the brachiopod Cincinnetina multisecta covered the surfaces of slabs.

And Vinlandostrophia sp. were fairly common. Some of these were Vinlandostrophia hopensis (next 3 pics).

That's all. Join us in March 2020 for our next field trip.

See our previous trip to this Fairview Formation site in Indiana.

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