Note on the abundance of Iron Ore in Northern Arizona.
BY WM. P. BLAKE.
In 1863 I observed an iron formation of considerable extent and interest upon and near the William’s Fork of the Colorado, near its mouth. The ore is chiefly the micaceous variety of Hematite, or “specular iron,” and occurs in thick beds and in thin sheets, in a ferruginous limestone or dolomite, evidently metamorphic, and tilted up at a high angle.
It forms a belt of peculiar appearance, that may be traced by the eye for miles across the country, in a direction a few degrees south of west. This rock and iron ore is inter-stratified with chloritic and talcose slates and granite, and the series also bears copper ores and gold.
From the collections made by Lieut. Whipple’s party, in 1853, in the mountains north, it would appear, that similar rocks exist in the Cerbat and Aquarius Mountains, the extreme geological antiquity of which, was commented on by me in the Pacific R. R. Reports, Vol. III, p. 59. It is possible that this ferriferous formation is connected with the extensive iron formation of the coast of Mexico, south of Acapulco, described by Mr. Manross, (Am. Journ. Sci., XXXIX, 358,) and it may be of pre-Silurian date.
Descriptions of New Marine Shells from the Coast of California.
PART III.
BY PHILIP P. CARPENTER, B. A., PH. D., OF WARRINGTON, ENG.
Genus Corbula, Lam. (Auct.)
Corbula luteola, Cpr. n. s. State Collection, No. 587.
C. t. “C. biradiatæ,” formâ simulante, sed multo minore; haud obesâ, transversâ, luteo-cinereâ, dorsum versum interdum obscure biradiatâ; angulo plus minusve carinato, postice definito; antice rotundatâ, expansâ; concentrice crebre sed obtuse lirulatâ; umbonibus obtusis; intus, dentibus minoribus; linea pallii angulatâ, haud sinuatâ; cicatricibus adductoribus callosis; margine t. adultâ postice altero alterum amplectante.