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  2. Paleontology in Oregon - Wikipedia

    en.wikipedia.org/wiki/Paleontology_in_Oregon

    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.

  3. Ochoco Mountains - Wikipedia

    en.wikipedia.org/wiki/Ochoco_Mountains

    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.

  4. Cavansite - Wikipedia

    en.wikipedia.org/wiki/Cavansite

    Its blue coloring comes from vanadium, a metal ion. [6] Discovered in 1967 in Malheur County, Oregon, cavansite is a relatively rare mineral. It is polymorphic with the even rarer mineral, pentagonite. It is most frequently found in Pune, India, and in the Deccan Traps, a large igneous province.

  5. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

  6. John Day Formation - Wikipedia

    en.wikipedia.org/wiki/John_Day_Formation

    The John Day Formation is a series of rock strata exposed in the Picture Gorge district of the John Day River basin and elsewhere in north-central Oregon in the United States. The Picture Gorge exposure lies east of the Blue Mountain uplift, which cuts southwest–northeast through the Horse Heaven mining district northeast of Madras.

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  8. Klamath Mountains - Wikipedia

    en.wikipedia.org/wiki/Klamath_Mountains

    The Klamath Mountains are a rugged and lightly populated mountain range in northwestern California and southwestern Oregon in the western United States.As a mountain system within both the greater Pacific Coast Ranges and the California Coast Ranges, the Klamath Mountains have a varied geology, with substantial areas of serpentinite and marble, and a climate characterized by moderately cold ...

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