| Gastropods from the middle to upper Mississippian Chainman Shale, western Millard County, Utah, not far from the eastern border of White Pine County, Nevada. Photograph courtesy Mackenzie Gordon Jr. and Ellis L. Yochelson; I edited and processed the image through photoshop. Specimens: 1-3--Gabrocingulum granulatum; 4-10--Gabrocingulum seminundum; 13-14--Gabrocingulum confusionense; 15--Gabrocingulum mephitiphontis; 16, 19--Gabrocingulum quadrigatum; 17-18--Gabrocingulum binodosum; 20--Gabrocingulum hosei; 21--Gabrocingulum sp. |