83 Michigan limestone on the East. A 'conductive dyke' cut- ting the same along the east side of the brook in a direction almost strictly parallel with the brook: N 80 E. Pre-strike of the two Carn- brian limestone is: strike Magnetio N 30 E Dip 25 N; In my estimation the quartzite of the conductive dyke and the cambrian conductive proper are totally distinct things, fossils, Sedithes linearis, Very common. Olenellus Thompsoni. I recall again the quartzite at 22 as probably a 'conductive dyke' I have to refer its cambrian sedimentary pro- gin.