26) At spring is mile S of Swan Bluff. Black slate. 56 feet of crossbedded lower Silurian and limestone, then, weathering firm, fine-grained, friable fin. chiefly within hips at lynx form and byzaram, at base; at Swan bluff are plants of helicifolds. At Tennessee Mines, between Black shale rests on Lower Silurian crossbedded. Two miles N of Lewis county line, on west side of Swan creek, on little stream bed at fort Hill. Two houses on top of hill going northward. Dan Dun can see black slate, Several chert layers, the intermediate 2 1/2 ft rock all rotted away. Chintun? Layer Silurian crossbedded. 2 2 feet of chert layers with plenty of chinton Lellum, Helicites and tubulatus. Farmite farms. The Helicites rather abundant in one layer. Part of section on next page. Black shale preserving, although distinct in the same chert from vert unit. And Illaero day mines pay good 2 1/2 ft. chert in beds. Farmite farms. 6 ft & inc chert nodules in layers. Helicites common 5 ft up to layer mentioned above. 12 ft below this. All of this whitish limestone. About 1 mile north of Lewis County line, on east side of Swan creek, Anderson Morris lives along road directly north of the locality about 200 yds. W. D. Aydlott's property, bluff 11 feet tough, head and neck of Illaero- gino Day mines in top of masses; looking whitish limestone here. Some part is white and very dense. Mr. chert. In this respect it resembles clearly the lyxite part of last sec- Lime. 1/4 mile south of where we turned to go to the Tennessee Mine farm, can see as layer of black slate directly above the Illaero. 3 1/2 ft & over Silurian up to their level in Wide creek, where I turn off to Dan Dun mine. On creek where road turns N to Tennessee Mine. Phenefield at Mine 7th foot above creek Rock also strongly east. Some layer.