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Just to show a unique take from my perception. Let's start at the bottom of the floodplain downriver of St. Anthony falls down to lilydale. This is St. Peter sandstone, one of the most obvious rocks along the Mississippi river. It can in certain ravines look like the badlands because of its unusual properties. Seem like it's highly resistant to flowing water. The samples I took is from battle creek park where all the overlying rocks are gone washed away by the old minnesota River when it is much bigger than the Mississippi River after the last glacial retreats leaving behind only St. Peter sandstone. When physically touched fresher ST. Peter sandstone crumbles rapidly into nearly pure silica sands, which makes me wonder why it's not used in glassworks. Who know? Then after exposure to the elements for a while it tends to chemical react and harden into more resistant form which takes more force like hammer or your feet to break in pieces. The samples I took pic of includes the sand form which are bright white and a harden form.