01009nam a2200253Ia 4500001000700000003000500007005001700012008004100029010001500070050002100085082002300106086001700129100003000146245011500176260011600291300004600407490005900453500003800512504005200550650004700602650002800649650003200677651004600709192019BIBL20160527191858.0930309s1993    dcuab    b   f000 0 eng    a 93003585 00aQE685b.N55 199300a551.7/7/0979522200 aI 19.16:15211 aNilsen, Tor Helge.2Local10aStratigraphy of the Cretaceous Hornbrook Formation, southern Oregon and northern Californiacby Tor H. Nilsen.  aWashingtonbU.S. G.P.O.aDenver, CObFor sale by Book and Open-File Report Sales, U.S. Geological Surveyc1993.  aiv, 89 p.bill., maps (some col.)c28 cm. 0aU.S. Geological Survey professional paperv15212Local  aOne map on folded leaf in pocket.  aIncludes bibliographical references (p. 77-82). 0aGeology, StratigraphicyCretaceous.2Local 0aGeologyzOregon.2Local 0aGeologyzCalifornia.2Local 0aHornbrook Formation Calif. and Or.2Local