User:Abyssal/Portal:Carboniferous/Selected picture/15

Photomicrograph of fossiliferous limestone (bisoparite or grainstone) from the Stoner Member of the Stanton Formation (Pennsylvanian) from the Ash Grove Quarry near Louisville, Nebraska. Coiled fossil is a fusilinid foraminifera. Coordinates are approximate.
Photo credit: Rygel, M.C.