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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Upper Cretaceous rocks in Siskiyou County, California, and in adjoining Jackson County, Oregon, are herein defined as the Hornbrook formation. A new name to differentiate them from the Chico formation in California is justified by their remote position and by their nearly complete lack of faunas in common with the Chico at its type section. The Hornbrook formation comprises at least 2,500 feet of arkosic wacke sandstone, siltstone, mudstone, and conglomerate; contains fossils of Cenomanian, Turonian, and Campanian age; and includes one unconformity.
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