August 19, Harker Bay. North shore continued. In the afternoon we re-examined the north shore to make certain of the Lower Cambrian strata and their outcrop westward to the fault line. I collected fossils while Denton and Edwards traversed the north shore to near Horse Island. I am now certain that all of the strata to the east of the whole fault are Lower Cambrian, and that probably none of these strata are repeating on the south shore. The sequence of the lithology is different and the thicknesses of the various masses is also dissimilar. The fact that there is much seracactin, Cryptogams and interformula-trion corals cannot outweigh the different lithology and especially the fossils collected in this shore. The beds that have Olenellus on the south shore have their counterparts on the north shore but are not the same horizon. In all of the Cambrian strata one is impressed by the shallowness of the waters. Even the muddy and sandy lts, are either sero-cracked, knotty, pitted or have algaoid formations. When finer they are all the more certainly sero-cracked. Of dark-blue fine crystalline limestone I saw one large fossil free of Bacterellas (see specimen) but none and more seen in place. This bed was at least 6 feet thick, and its top was knotty. At our camp there are other thin and seemingly deep water lts, but as they are replete with 'button' algae they are seen to be not very deep water deposits. The great amount of sandstones and the muddy and sandy nature of all the deposits rule further herseal shallow water deposits.