Wikimedi'Òc

Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 1 (18811859270).jpg - Natuur12

Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 2 (18973310496).jpg - Natuur12

Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 7 (18811823918).jpg - Natuur12

Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 6 (18378820923).jpg - Natuur12