- Photo
- Lidar Scan: Scan failed, unavailable
- ERA: Paleozoic
- Period / Epoch: Late Mississippian / Early Pennsylvanian
- Age: 331-318 million years ago (reference)
- Formation: Stanley Group / Hatton Tuff
- Lithology: Volcanic tuff, debris flow
- Original location: 34.351096,-94.353428
- Donor organization: Martin Marietta Hatton Quarry
- Donor contact: Todd Wheeler
- Financial support:
- Mac and Karen McGilvery
- MacNote: Hatton Tuff Lentil within the Lower Stanley Gp. Bedded volcanic tuff deposits interpreted as deepwater gravity flows triggered from thick ash fall deposits along the basin margin or from vertical settling through the water column. Interpretation is still being debated.