Catalog Number: CG-0087

This is the first specimen of Petalodus ohioensis I have recovered from Pine Creek Limestone. Specimens of Petalodus can be found in marine zones throughout the Glenshaw Formation, so finding one here is no surprise. However through several trips to the locality, which is around 10 miles North East from our own local section, I’ve never found any evidence of P. ohioensis there until yesterday (July 11, 2020).

Specimen is-situ in larger piece of Pine Creek Limestone

In reducing the boulder into smaller pieces, one such break revealed this dark black tooth brown. Most specimens recovered have a bright silver to white color. However, the coloring here was not unusual. With the high organic content within the rocks, this is not unusual to find anything colored black within.

Photos of the Specimen freed

Catalog IDSpecimen NameCrown HeightCrown Width
CG-0015Petalodus I6mm23mm
CG-0016Petalodus II9.5mm24mm*
CG-0029Petalodus III8mm28mm*
CG-0027Petalodus IV10.5mm**
CG-0034Petalodus V14mm27mm*
CG-0038Petalodus VI5.5mm*****
CG-0045Petalodus VII10mm25mm
CG-0047Petalodus VIII13mm31mm
CG-0048Petalodus IX******
CG-0055Petalodus X11mm†28mm
CG-0058Petalodus XI8mm†27mm
CG-0070Petalodus XII******
CG-0087Petalodus XIII9mm23mm
Current specimens found and metric measurements. Crown height measured from start of root on lingual side. This includes a dark band that was originally covered by the distal crown tongue.
* – Measured based on symmetry. One side broken/obscured.
** – Unable to measure, both sides broken.
*** – From top of distal crown tongue.
**** – Unable to measure, crown broken.
† – Measured from labial side.