“…1); Pardee (1918, p. 33-34) considered the rocks to be probably of Mesozoic age. More recent mapping to GEOLOGY, BALD KNOB QUADRANGLE, WASHINGTON F25 the north of the reservation by Muessig and Quinlan (1959) in the Republic quadrangle and by Calkins, Parker, and Disbrow (1959) in the Curlew quadrangle indicates that some of the granitic rocks are of Tertiary age. In these two quadrangles the O'Brien Creek Formation of Eocene (?)…”