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Oregon's oldest known rock formations are found in the Blue Mountains and the Klamath Mountains. [2] [3] The state's oldest individual rock is a limestone near Suplee dated to nearly 400 million years ago, during the Devonian period of the Paleozoic era.
Measuring 235 feet (72 m) tall, [3] Haystack Rock is composed of basalt and was formed by lava flows emanating from the Blue Mountains and Columbia basin about 15-17 million years ago. [5] The lava flows came from massive eruptions from a source believed to be what is now the Yellowstone volcanic hotspot, and created many of the Oregon coast's ...
The Ochoco Mountains are a mountain range in central Oregon in the United States, located at the western end of the Blue Mountains. They were formed when Permian, Triassic, and Jurassic rocks were slowly uplifted by volcanic eruptions to form the Clarno Formation. Today, the highest point in the range is Lookout Mountain.
The level III ecoregions in Oregon are the Coast Range (1), Willamette Valley (3), Cascades (4), Eastern Cascades Slopes and Foothills (9), Columbia Plateau (10), Blue Mountains (11), Snake River Plain (12), Klamath Mountains (78), and Northern Basin and Range (80). (Compare to map of Level IV ecoregions.)
The local Facebook group HVL Rocks has members painting and hiding rocks. They have been found all across the U.S. and even overseas.
Erratic Rock State Natural Site is a state park in the Willamette Valley of Oregon, United States. Featuring a 40-short-ton (36 t) glacial erratic from the Missoula Floods, the small park sits atop a foothill of the Northern Oregon Coast Range in Yamhill County between Sheridan and McMinnville off Oregon Route 18.
With the help of dog Milo, Randy Bjorklund of Bonney Lake digs for lily pad jasper and petrified wood at a site in the mountains above Greenwater during a field trip with amateur rock hounds Aug. 17.
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