Ripple-marked sandstone
Numéro d’image : 11741609
| A vertical bed of quartzite at Mitcham,Australia,part of the Adelaide Geosycline. Quartzite is a metamorphic rock derived from sedimentary sand- stone. The undulating structures visible on the rock are ripple marks,a relic of this sedimentary origin; they were shaped,before rock formation took place,by the movement of fluid over the unconsolidated sediments. The rocks here were formed in a shallow water environment around 750 million years ago and converted to quartzites and slates around 450-500 million years ago. Following a period of mountain building which occurred about 50 million years ago,the beds are presently around 300 metres above sea-level and vertical | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3788 px × 2480 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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