Yaquina Formation

Thick- to thin-bedded sandstone, conglomerate, and tuffaceous siltstone of deltaic origin; locally contains thin coal and ash beds. Conglomerate contains abundant clasts of pumice and dacitic volcanic rocks. In places includes thick lenses of marine tuffaceous siltstone and fine-grained sandstone. Foraminifers in formation assigned to the Zemorrian and lower part of the Saucesian Stages of Kleinpell (1938) and molluscan fauna to the lower Blakeley Stage of Weaver and others (1944)
State Oregon
Name Yaquina Formation
Geologic age Late Oligocene to Early Miocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Incidental
Sedimentary > Coal (Bed)
Igneous > Volcanic (Pyroclastic-tuff)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Kleinpell, R.M., 1938, Miocene stratigraphy of California: Tulsa, Oklahoma, American Association of Petroleum Geologists, 450 p.

Weaver, C.E., Beck S., bramlette, M.N., Carlson, s., and others, 1944, Correlation of the marine Cenozoic formations of western North America [Chart 11]: Geological Society of America Bulletin, v. 55, p. 569-598.

NGMDB product
Counties Lincoln