Myrtle Group

Conglomerate, sandstone, siltstone, and limestone. Locally fossiliferous. As shown, includes Riddle and Days Creek Formations (Imlay and others, 1959; Jones, 1969)
State Oregon
Name Myrtle Group
Geologic age Late Jurassic to Early Cretaceous
Lithologic constituents
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Carbonate > Limestone (Lens)
Comments Part of Snow Camp Terrane of Blake and others (1985)

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

Blake, M.C., Jr., Engebretson, D.C., Jayko, A.S., and Jones, D.L., 1985, Tectonostratigraphic terranes in southwest Oregon, in Howell, D.G., ed., Tectonostratigraphic terranes of the circum-Pacific region: Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, v. 1, p. 147-158.

Imlay, R.W., Dole, H.M., Wells, F.G., and Peck, D., 1959, Relations of certain Upper Jurassic and Lower Cretaceous formations in southwestern Oregon: American Association of Petroleum Geologists Bulletin, v. 43, p. 2770-2785.

Jones, D.L., 1969, Buchia zonation in the Myrtle Group, southwest Oregon [abs.]: Geological Society of America Abstracts with Programs, Cordilleran Section Meeting, 65th, Eugene, Oregon, pt. 3, p. 31-32.

NGMDB product
Counties Coos - Curry - Douglas