| State | Oregon |
|---|---|
| Name | Cowlitz Formation |
| Geologic age | Middle Eocene to Late Eocene |
| Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Mudstone (Bed)
|
| References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.Mallory, V.S., 1959, Lower Tertiary biostratigraphy of the California Coast Ranges: Tulsa, Oklahoma, American Association of Petroleum Geologists, 416 p.Newton, V.C. and Van Atta, R.O., 1976, Prospects for natural gas production and underground storage of pipe-line gas in the upper Nehalem River Basin, Columbia-Clatsop Counties, Oregon: Oregon Department of Geology and Mineral Industries Oil and Gas Investigations 5, 56 p. |
| NGMDB product | |
| Counties | Clatsop - Columbia - Tillamook - Washington |