|
USA | |
- Carlsbad Caverns National Park
| Clays and Clay Minerals June 2000 v. 48 no. 3 p. 317-321 |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. Wolberg, D. L. (1994). Fossils, Rocks and Ancient Environments of the Late Cretaceous Fossil Forest Locality, San Juan Basin, New Mexico Combining Science and Education. Maps Digest Expo XVI Edition, 126. |