(5) My lowest fossil zone in the Mississouri makes, the base of this formation, it is a thin bedded li. grey, the li. separated by threads of clay to black shale, about 8 to 10 feet thick. Over it lies 6 to 8 ft. of a very good quartzite. Higher still is a rounded grey of considerable width, and then another quartzite of 4 feet in once thickness. Then another rounded grey, followed by 3 to 4 feet of dolomite, then the black shale zone, on which lies the main mass of thin bedded li. and grey of intraformational flat bottom sandy dolomites, etc up to the top of the Missour-i quartz limestone. We then went to the little quarry in the Orlehoton road metal diggings about 1/2 mile N.W. of Hillsdale Centr. Much quarrying has been done since last gear and we see the strata now better than ever. Below are exposed about 6 feet of laminated black sandy slate and then beds of sandstone, then about 4 feet of sandy dolomite, followed upwards by about 6 feet of thin bedded sandstone and some