Wikimedi'Òc

Bedrock geology of Minnesota.png - GifTagger

Herringbone & trough cross-stratified quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) (18994340992).jpg - Natuur12

Intraclastic quartzose sandstone (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 2 (18812833890).jpg - Natuur12