Yes, South Dakota.
Naw; not the pretty stuff. :(
Just the common, grey stuff.
We had to drill through about 700’ (as well as other strata)or so of it, to get down to the aquifer.
Some has fossil poyps; some has a few fossil shells/shell casts; but most is just undifferentiated bottom-ooze type limestone. All of it is a PIA, when trying to drive posts, dig, rototill, plow, or bulldoze. LOL
This whole area was a shallow sea more than once.
4-5 miles NE of us is Wind Cave N.P.
Just over 4 miles ESE, some of the limestone disolved, and the surface caved in, forming a sinkhole about 15-20,000 years ago. That filled with warm water from the hot springs, making a good winter watering hole, but it also trapped more than 100 mammoths over the centuries, both wooly & Columbian. They’ve also found a short nosed bear, camels, and several predators & scavengers, as well as other critters. http://www.mammothsite.com/
Mammoth site sounds cool too! I hope to make a cross country trip some day through the northern plains, Just to see how much open space there still is.
Stay Warm up there.
Regards
Bonehead