near the bottom, and the upper cherty Gneiss is 10 ½ feet thick. The total Devonian limestone one thick- ess is therefore 24 ½ feet. The Black shale overlies it. The Devonian limestone rests directly on the clayey greenish Madison. 188 (1060) L.S. About ½ mile before reach- ing Rush Branch, on the north side of the creek there is a bluff exposure. The junc- tion between the Devonian and Lower Silurian is at 1060. The total thickness of the De- vanian limestone is 17 feet. The lower 4 feet consist of a very arenaceous brown rock, The Devonian rests directly on the blue clayey Madison rocks. The thin bedded shale Madison occurs below. The total thickness of the Madis-on is 50 feet. The fossilifer- Riche and beds extend down to the river, 20 feet below. 203 (1107) L.S. Just east of the Madison- county line, on the road to Jack Town and Hurstsville, the top of the hill above the Madison bluff still shows Lower Si- lurian. About 17 feet of Madison rock are exposed and they are quite typical; thin bedded and blue clay shales. Overlying the Madis- on are 65 feet of fossilif- erous limestone, the lower 5 feet containing many Murchuinas. This is the largest fossiliferous section overlying the Madison yet far examined. The highest Lower Silurian fossils were found at 1107. The top may have been higher, since no Devonian was found. 204. Up Martin's Creek from Jacktown = 2 miles north of Jacktown, the top of the Lower Siluria was some- where between 1130 and 1160. The contact with the Devonian was not seen.