Catalog Number: CG-0047
One large piece of limestone needed broken into two or three pieces to haul back. With one crack of the 16lb sledge hammer, a chunk of limestone separated and exposed this very nice Petalodus tooth. This particular tooth specimen sets a few firsts. It’s the widest tooth I’ve found at 31mm. It is the second tooth that I was able to remove from the rock matrix. And it’s the first removed one with preserved enamel present.
The last Petalodus tooth I found was found exposed directly to the stream bed and was eroded. Most shell and tooth material I find has a bit of original preserved organic material left. It is said that the highly organic local rocks block the processes that typically remove these materials. The limestone is of high organic content, with it’s dark composition being the key piece of evidence. When ancient seas contain very little oxygen, any organic material that settles on the bottom resits decay.
I glued the corner back on using Paraloid B-72. The specimen is also missing it’s root. The root likely shattered when the rock came apart. I was also able to preserve the mold, as shown below. The large distal crown tongue grooves are prominently visible on the mold. Also, you can see left-over enamel material gives the tooth blade area its color.
Gallery of Petalodus Photos
Labial View 
Corner chipped, but was later glued back on 
Microscopic Petalodus Tooth Views
Lingual side shown 
Other Petalodus Finds
This is the eight Petalodus tooth that I have found, here in Parks Township. All specimens collected thus far are listed below. Visible below as CG-0047, this specimen has the widest crown width of all current specimens. The crown height measurement may need adjusted, however. It should be measured either on the lingual or labial side for all.
| Catalog ID | Specimen Name | Crown Height | Crown Width |
|---|---|---|---|
| CG-0015 | Petalodus I | 6mm | 23mm |
| CG-0016 | Petalodus II | 9.5mm | 24mm* |
| CG-0029 | Petalodus III | 8mm | 28mm* |
| CG-0027 | Petalodus IV | 10.5mm | ** |
| CG-0034 | Petalodus V | 14mm | 27mm* |
| CG-0038 | Petalodus VI | 5.5mm*** | ** |
| CG-0045 | Petalodus VII | 10mm | 25mm |
| CG-0047 | Petalodus VIII | 13mm | 31mm |
| CG-0048 | Petalodus IX | **** | ** |
| CG-0055 | Petalodus X | 11mm† | 28mm |
| CG-0058 | Petalodus XI | 8mm† | 27mm |
| CG-0070 | Petalodus XII | **** | ** |
| CG-0087 | Petalodus XIII | 9mm | 23mm |
| CG-0102 | Petalodus XIV | Coming Soon | Coming Soon |
| CG-0107 | Petalodus XV | Coming Soon | Coming Soon |
* – Measured based on symmetry. One side broken/obscured.
** – Unable to measure, both sides were broken.
*** – From the top of the distal crown tongue.
**** – Unable to measure, crown broken.
† – Measured from the labial side.