When I dig in the backyard, I find some topsoil and then the plastic liner the landscapers put in under the flowerbed. When Swedes and Norwegians dig around,, they find stuff like "the grave of a wealthy Viking farmer, buried with his horse, sword, spear and shield" or "a treasure cache... of silver coins, weighing a total of around 3 kilos" and including a rare Arab coin. (Those Vikings got around.) As one article points out, both finds are fantastic, but trivial compared to the magnificent Oseberg Ship, uncovered on a Norsk farm in 1904, but they beat just about everything you might dig up in Minnesota, even the Kensington rune stone.
Blowing & Drifting
Forecast: Significant blowing and drifting, with the possibility of heavy accumulation in rural areas.