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== Géologie ==
<gallery>
Aerial view of Grand Prismatic (23428929375).jpg
File:Coal mine canyon, AZ.jpg
File:Cheltenham Badlands1.jpg ▼File:Cheltenham Badlands closeupBadlands1.jpg
▲File:Cheltenham Badlands1Badlands closeup.jpg
Image:IMG.svg
Image:Glacial Pothole.jpg
Image:VermGlacial wavePothole.jpg
Verm wave.jpg
Image:Balanced rock.ds.jpg
Image:Wave Rock.JPG
Image:Balanced rock ir.jpg
Image:Kilt Rock 2.JPG
Image:AyersKilt Rock bottom2.jpgJPG
Ayers Rock bottom.jpg
Image:Opal-rock hg.jpg
Image:Sandstone erosion.jpg ▼Image:Picture Sandstone from Utaherosion.jpg
▲Image:Picture Sandstone erosionfrom Utah.jpg
Image:Tafoni by Endico.jpg
Image:Tafoni by Endico.jpg
Canyonlands National Park, Utah.jpg
Image:Ichnofossil.jpg
Image:LionHeadSandstone.jpg
Image:PetraRock2.jpg
Image:Lower antelope 3 md.jpg
Image:Fault limestone.jpg
Image:Lapiaz-Limestone Pavement.jpg
Image:Fissured rock - isle of man.jpg
Image:Burren (dstutz).jpg
</gallery>
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