The richly fossiliferous L.S. bed the top of the Madison rock is about 38 feet above the richly fossiliferous Circu- lation Brum beds. This would then be the thickness of the Madison beds here. The middle parts of the Mad-i- som beds are composed of thin shales apparently. The rich- ly fossiliferous bed contains, Cerithis biforata cerithis occidentalis. Murchisonia acule angula several lamelli branchio to. Although the total thickness of strata between this upper fossil bed and the fossil bed below the Madison rock is 38 feet, the Mad-i- som beds are probably to be regarded as only 33 feet thick. And the upper 5 feet are the representatives of the deep blue dense limestone found in the J.S. Under- wood section, to be described next. 6 ft. 6 in. above the Murchisona bed is a layer of clay full of Chomopolyllum? Cystiphyllum? 41 5 feet above the basal bed the clay is full of large pieces of chert representing the bed full of heavy chert, usually found below the brecciated layer. All of these upper lizuea stones, from the Murchisonia bed to the black shale have here disintegrated into clay. J. S. Underwood section. 275 223 Half way between Morel and and Carpenters station, where the largest branch crossing this part of the road is footed ed, is located the farm of J. S. Underwood. Along the southern side of the stream, near the road, there are some fair exposures. The Madison beds are at least 48 feet thick, accor- ding to barometric meas- urements. It is overlaid by 6 feet of dense, dark blue limestone containing Lower Silurian fossils. These fossils are