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Simcoe volcano

volcanic field
Washington, USA (mainland exept Alaska), 46.1°N / -120.9°W
Current status: (probably) extinct (0 out of 5) | Reports
Simcoe volcano books
Typical eruption style: Explosive
Simcoe volcano eruptions: ca. 5-1 million years ago (Lincoln Plateau & Signal Peak: 1-0.5 million years ago)
TimeMag. / DepthDistanceLocation
Fri, 20 Jul
Fri, 20 Jul 06:25 UTCM 2.6 / 16 km63 km WASHINGTON
Thu, 19 Jul
Thu, 19 Jul 06:57 UTCM 2.8 / 16 km62 km WASHINGTON
Thu, 19 Jul 02:17 UTCM 0.5 / 13.9 km65 km- 1km SSW of Selah, Washington
Thu, 19 Jul 01:18 UTCM 1.2 / 13.9 km65 km- 2km N of Yakima, Washington
Wed, 18 Jul
Wed, 18 Jul 17:54 UTCM 2.5 / 12 km18 km WASHINGTON
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Simco volcanic field is a N-S aligned cluster of 24 monogenetic cinder cones. It is located E and SE of Mt Adams, Washington, California, near the town of Goldendale.
Associated is the younger basaltic Lincoln Plateau with Signal Peak at the western end of the field and east of Adams. It was formed by a shield volcano active until about half a million years ago.

Background:

From: Wood and Kienle, (eds.), 1990, Volcanoes of North America - United States and Canada: Cambridge University Press.
cited on CVO website(USGS Cascades Volcano Observatory)
"
East and southeast of Mount Adams, extending south to the town of Goldendale, is a broad expanse of folded and faulted basalt that is little known. A north-south line of around 24 cinder cones crosses the center of the field, and south of the 46th parallel another dozen cones extend the line to the southeast. The oldest units are thick flows of rhyolite in the eastern Simcoe Mountains. These are contemporaneous with pyroxene-olivine basalt and olivine basalt of the Simcoe Mountains. The pyroxene-olivine basalt forms short, 6-10-meter-thick flows, whereas the olivine basalts are 1-6-meter-thick flows, extruded from small shields and cinder cones. A few of the above units are dated at 4.5 to 0.9 million years ago.
East of Mount Adams are a shield volcano and the lava flows forming Lincoln Plateau; all are olivine basalt probably younger than 0.9 million years. Perhaps the youngest unit of this volcanic field is the dacite that forms Signal Peak, east of Mount Adams, that is believed to be 1.0-0.5 million years.
"


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