Small, spherical ironstone concretions called Moqui marbles are seen forming in this close up a Navajo sandstone formation in Snow Canyon State Park, Utah, USA. The concretions are formed by the uneven weathering of elements within the sandstone. | |
Licence : | Droits gérés |
Crédit : | Science Photo Library / Matulavich, Peter |
Model Release : | Non requis |
Durée : | 9 Secondes |
Aspect ratio : | 16/9 |
Restrictions : | - |