northward to 20 feet, due perhaps to shelly limestone being more limy. Very frondiferous. Equals Richardsons C.6. [He eroded in error the joints as coming from June 22]. (21) June 25. Circular more a less limy gray slate inter- terstratified with some pure dark slate, the latter containing interbedded yellow cross-bedded quartzites up to 6 inches. Strike N.24 E., dip 32 W. Some of the shale beds changed to flint. Holds Olenellus, the small Aglacinidae, a sach cystid and the psritized Dalterello. Equals Rich- ardsons C.7. Thickness 70 feet. (22) June 26. Gray to dark circular limestone, Rich- ardsons C 8. Thickness 13 feet. (29) June 27. Bluish-black slate with Dalterella casts, Richardsons C.9. Thickness 68 feet. "The summit of this section is found at the northern of Deer Brook Bay." This gives the Lower Cambrian here a thickness of about 1728 feet against 375 feet at Labrador, Richardson made it 1711 feet. He are in agreement as to thickness but cannot agree to his definitions of the various zones given in his Divisions A and B. What the original total thickness of the Lower Cambrian was one cannot tell as in all places seen by us the section terminated in the sea but ac- cording to Logan upon the zone C 9