Front:
GEOLOGIC MAP OF OREGON
EXPLANATION
CE NOZOIC
SCALE
Alluvium.
50.
25
50 MILES
Pendleton
Basalt and andesite.
Portland
Andesite & basalt of
High Cascade Range.
Nonmarine sedimentary
SALEM
and volcanic rocks.
Basalt and andesite.
Marine sedimentary rocks.
Marine and nonmarine
Eugene
Вend
voleanic rocks.
Volcanic & continental
sedimentary rocks.
Burns
MESOZOIC
Volcanic and sedimentary
rocks (metamorphosed in
places).
PALEOZOIC
Sedimentary rocks (strongly
metamorphosed in places).
INTRUSIVE IGNEOUS ROCKS
Mesozoic granitic rocks.
Medford
Ultramafic intrusions
(age undifferentiated).
Adopted from U.S. G.S. 1969.
Major Cenozoic volcanoes
Calderas
.• Faults
РАСI FIC
O CE A N
QUATERNARY
TERTIARY
Back:
ANOTHER
André
ORIGINAL
D-17527
Font Card
ANDERSON'S SCENIC POST CARDS, PORTLAND, OREGON 97219- CURTEICH COLOR®
Facts about Oregon: Oldest rocks-370,000,000 years;
Latest volcanic eruption – 1825 (on Mt. Hood); Princi-
ple minerals – gold, silver, nickel, mercury, chromite.
Gold discovered 1850 at Jacksonville. Fossils – nu-
merous remains of land and sea plants and animals.
State Rock – Thunderegg, a quartz-filled geode.
DGEN.4
