"Dried Mud Flats" Interpretation Sign Jeffers Petroglyphs Historic Site ~ Comfrey, Minnesota
These mud flats were created by sediment deposited by flood waters. Heavier sediment, such as sand, drops out first. The silt & lighter mud is deposited. This mud flat dried & cracked in hexagonal shaped in the sun after flood water receded, over a million years ago. It was then covered with layers of sediments which preserved the cracked appearance. Many layers of sediments produced pressure over millions of years & created the Sioux Quartzite that we see today. :)
"Dried Mud Flats" Interpretation Sign Jeffers Petroglyphs Historic Site ~ Comfrey, Minnesota
These mud flats were created by sediment deposited by flood waters. Heavier sediment, such as sand, drops out first. The silt & lighter mud is deposited. This mud flat dried & cracked in hexagonal shaped in the sun after flood water receded, over a million years ago. It was then covered with layers of sediments which preserved the cracked appearance. Many layers of sediments produced pressure over millions of years & created the Sioux Quartzite that we see today. :)