Dry Dredgers Field Trip
April 28, 2007
Middletown, Ohio

Page 3
2 3 4 5 6 7

Fossil Found on Site 1


The only trilobites found at either site that day were fragments. The best of these was this spiney fragment of the incredible trilobite, Acidaspis.(see below)


At the first site, the most common Brachiopod was the large and impressive, Vinlandostrophia ponderosa.

This first site exposed most of the Mt Auburn member of the McMillan Formation. In this member, the Vinlandostrophia ponderosa have a diminished hinge line that is both shorter and points downward towards the commissure. This difference makes it a separate subspecies called P. ponderosa auburnensis. (Note the profile in the next two photos)

Some of the Vinlandostrophia ponderosa were encrusted with bryozoans. The specimen pictured below is completely encrusted on one valve and not at all on the other side. I would assume that this is the side that was facing upwards while the bryozoans were alive.
  platystrophia_encrusted1.jpg platystrophia_encrusted2.jpg   

Another brachiopod found on site 1, was the beautiful Hebertella. (next 3 pics)
P1010051.jpg P1010052.jpg  

Here's Mike's finds a about half way through the first site, to give you an idea of the variety and kind of fossils found.

When you look at the ground in the area where these brachiopods were being found, you see tons of broken brach's. It's kind of inspiring to look for the whole ones, often sticking up partially from under the dirt and shale.

Another abundant brachiopod was the Rafinesquina. Here we found entire pavements on the flat field illustrating how these animals lived and died.

Among the inarticulate brachiopods found was the ubiquitous Petrocrania scabiosa, seen in the shot below attached to a Vinlandostrophia ponderosa.

Next Page: More Fossils Found at the First Site

T A B L E     O F     C O N T E N T S 

Page 1: Site 1 Introduction
Page 2: Site 1 Collecting Pics

Page 3: Site 1 Fossils Found: Trilobites and Brachiopods

Page 4: Site 1 Fossils Found: Cephalopods, Bivalves and Gastropods

Page 5: Site 2: The Site and Brachiopods Found

Page 6: Site 2: Inarticulate Brachiopods and Gastropods Found

Page 7: Site 2 Bivalves, Bryozoans and Cephalopods Found

Back to Field Trip Index

Return to Dry Dredgers Home Page

The Dry Dredgers and individual contributors reserve the rights to all information, images, and content presented here. Permission to reproduce in any fashion, must be requested in writing to admin@drydredgers.org .