Basalts of both Eocene and Miocene age from several groups
along the Oregon and Washington coasts have been analyzed for some
major, minor, and trace elements using instrumental neutron activation analysis (INAA). The rare earth element (REE) patterns observed
in these samples are used for comparisons within the groups studied...
The Paleocene-lower Eocene volcanic rocks of the southern Oregon Coast Range
Roseburg Formation are the oldest remnant eruptive sequence of an oceanic islandseamount
province which is presently exposed along a north-south lineament that stretches
from Vancouver, B.C. into southwestern Oregon. This seamount terrane is thought to
have formed on the...