Ordovician and Silurian Phi Kappa and Trail Creek Formations
Ordovician and Silurian Phi Kappa and Trail Creek Formations, Pioneer Mountains, Central Idaho Stratigraphic and Structural Revisions, and New Data on Graptolite Faunas GEOLOGICAL SURVEY PROFESSIONAL PAPER 1090 ORDOVICIAN AND SILURIAN PHI KAPPA AND TRAIL CREEK FORMATIONS, PIONEER MOUNTAINS, CENTRAL IDAHO STRATIGRAPHIC AND STRUCTURAL REVISIONS, AND NEW DATA ON GRAPTOLITE FAUNAS WEST SOp EXPLANATION THRUST FAULT Showing relative movement. FAULT Showing relative movement Teeth on upper plate APPROXIMATE BEDDING TRACE Frontispiece. Imbricate thrust slices of the Phi Kappa (SOp) and the three sections originally measured for the Phi Kappa Forma Trail Creek (St) Formations on the ridge between Park and Little tion by Westgate and C. P. Ross (1930), called the Park Creek Fall Creeks, Pioneer Mountains, Idaho. The imbricated Phi Kap ridge section in this report, extends eastward from point A along pa-Trail Creek allochthon moved eastward over deformed clastic the ridge crest and beyond the right edge of the photograph, rocks of the Mississippian Copper Basin Formation (Me in lower where it crosses the sole thrust of the Phi Kappa-Trail Creek right and distant ridge). Silurian and Devonian rocks (DSr) over allochthon (thrust fault with close-spaced teeth). rode the Phi Kappa-Trail Creek allochthon from the west. One of Ordovician and Silurian Phi Kappa and Trail Creek Formations, Pioneer Mountains, Central Idaho Stratigraphic and Structural Revisions, and New Data on Graptolite Faunas By JAMES H. DOVER, W. B. N. BERRY, and R. J. ROSS, JR. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1090 Biostratigraphic and structural field studies in lower Paleozoic rocks of central Idaho UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1980 UNITED STATES DEPARTMENT OF THE INTERIOR CECIL D.
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