Activity David Powers posted an update in the group Bodacious Brachiopods 4 years, 2 months ago 4 years, 2 months ago 4 years, 2 months ago Productid brachiopods found in situ in Kibbey Formation part of the Big Snowy Group in Montana. Location is above rest stop north of Monarch, Montana. These have their spines. The spines lace through the matrix of mudstone.