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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 Blue Mountains are a mountain range in the northwestern United States, located largely in northeastern Oregon and stretching into extreme southeastern Washington. The range has an area of about 15,000 square miles (39,000 km 2 ), stretching east and southeast of Pendleton, Oregon , to the Snake River along the Oregon– Idaho border.
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 local Facebook group HVL Rocks has members painting and hiding rocks. They have been found all across the U.S. and even overseas.
The Blue Mountains ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency (EPA) in the Pacific Northwest, mainly in the state of Oregon, with small areas over the state border in Idaho and southeastern Washington. It is also contiguous with the World Wildlife Fund's Blue Mountain forests ecoregion.
Some stones, particularly red and orange carnelian agates, can be found in creeks and on Washington’s beaches. One proliferate agate hunter, Chris Sims, who goes by the handle “ Carnelian ...
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