Odd Dakota sandstone concretions in Rock City,Kansas,are calcium carbonate deposits formed millions of years ago when the area was covered by an inland sea. Erosion has left these free-standing formations,some of which are up to 27 feet in diameter | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Steinberg, James |
Taille de l’image : | 3937 px × 2607 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|