148 August 13. Talle Stedell Section, revised. with rippling at 4' far from the top, and obscure sun-cracks at 20' from the top. This is the base of Rickard's zone I. The next lower division is darker in color and makes an easily distinguishing field guide. 6' Dark flint-bronze-gray friez cryptolite dolomite li, 36' More cloud dense and very hard dolomite li, weathering lighthuff-pay. Hearin redded than zone I. Some layers with obscure furoidal mottling. In places, trucciated and cemented with white crystalline dolomite. Many veins of dolomite. Some layers are laminated like stratum. Near the base of this zone is where Helicymognopetus occurs. 131 8' Darker gray stratum-like beds. 31' Dark- flint-bronze-gray dolomite. 17' Heavy flint -gray dark beds with furoidal mottling and cloudy white crystalline dolomite. Obscure Helicostoma an ecomm. 18' Heavy beds mottled white and dark-gray dolomite. About one-half white. At the base a Pilcunas oras found. 15' Light flint gray heavy bedded dolomite. This zone strikes into the hill. This takes us to the level of the lowest exposure in the north of the hill and to the top of the horizon of heavy and shale beds observed at the top of the section north of the hill on August 11. This gives a total of 131 feet in the