Ordovician fossils from southeast Indiana
All fossils were obtained (unless otherwise stated) from a roadcut
approximately two miles north of I-74 in Indiana
on State Highway 1, just south of Brookville. CLICK HERE (298 KB)
to see a birdseye view of the exposed area. The exposed rocks are from the Arnheim, Waynesville, Liberty, and
Lower Whitewater formations. All formations and the included fossils were
laid down during the Ordovician period, about 450 million years ago or so
and are part of what is known as the Cincinnatian Arch. This Arch is due
to a fold in the rock layers that allowed the younger rock layers near
the crest of the arch to be eroded and for the older Ordovician rocks to
To see a typical view of the exposed material from this site up close,
CLICK HERE (388 KB).
Identification of specimens was done with the aid of
Cincinnati Fossils:An Elementary Guide to the Ordovician
Rocks and Fossils of the Cincinnati, Ohio, Region. Ed.
R.A. Davis. Cincinnati Museum of Natural History. 1985.
I have done my best to identify the fossils presented here
correctly, but nobody is perfect, and I am not a professional. I
encourage anyone to contact me (firstname.lastname@example.org) if
they believe I have misidentified any of the specimens. I will do my
best to correct any errors.
The icons at the top of the pages represent most of the phyla found
at the location mentioned in the paragraph above. A few examples came
from other locations and are so noted.