For many years it has been reported that the core of the Hay Creek Anticline exposes metamorphic rocks of Paleozoic or Mesozoic age. On closer study it was found that these rocks consist of only slightly metamorphosed black to dark grey siltstones and sandstones with less abundant chert pebble conglomerate and recrystallized limestone. The sequence is here informally named "Hay Creek Formation." Calcareous nannofossils recovered and identified from the limestone yielded an age of early to middle Eocene.
The depositional environment of the "Hay Creek Formation" is interpreted to be a submarine turbidite fan. Siltstones were deposited as pelagic rain and turbidite fall out. Sandstones were deposited in turbidite flows as evidenced by flute casts. The Hay Creek Anticline formed as a result of multiple compressional forces, with periods of deposition and erosion between orogenic events.
The petroleum potential of the "Hay Creek Formation" is good. The total organic carbon in the siltstones, the kerogens and the maturity indicators suggest that oil and/or gas has been produced from these rocks. Shallow exploration drilling in the area has revealed that petroleum is present.
Lanny H. Fisk
H. Paul Buchheim
Ivan G. Holmes
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Rocks; Sedimentary; Sediments (Geology) -- Oregon; Petroleum -- Geology -- Oregon
Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Wareham, Stephen I., "Geology and Petroleum Potential of the Hay Creek Anticline, North-Central Oregon" (1986). Loma Linda University Electronic Theses, Dissertations & Projects. 734.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives