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  2. Glacial erratic - Wikipedia

    en.wikipedia.org/wiki/Glacial_erratic

    The location and altitude of ice-rafted boulders relative to the modern landscape has been used to identify the highest level of water in proglacial lakes (e.g. Lake Musselshell in central Montana) and temporary lakes (e.g. Lake Lewis in Washington state). Ice-rafted debris is deposited when the iceberg strands on the shore and subsequently ...

  3. Glacial erratic boulders of Snohomish County, Washington

    en.wikipedia.org/wiki/Glacial_erratic_boulders_of...

    Everett Boulder, erratic found 30 feet (9.1 m) underground at downtown construction site, Colby Avenue and Wall Street. 18 feet (5.5 m) long, and 10 feet (3.0 m) high, weighs approximately 300,000 pounds (140,000 kg). [6] [7] [8] The erratic briefly had over one hundred Twitter followers and was eventually reburied. [9

  4. Glacial erratic boulders of the Puget Sound region - Wikipedia

    en.wikipedia.org/wiki/Glacial_erratic_boulders...

    Name and description Height County Image Airport Boulder, at Martha Lake Airport Park in Martha Lake, said to be "one of the largest glacial erratic boulders in urban King, Snohomish, and Pierce counties", [9] is approximately 20 feet (6.1 m) long on its longest axis and about twice a man's height.

  5. Hickory Run State Park - Wikipedia

    en.wikipedia.org/wiki/Hickory_Run_State_Park

    The top of the boulder layer is virtually level with the approaching path. [4] This boulder field, known as the Hickory Run boulder field, is the largest of its kind in the Appalachian region. It consists of a very gently sloping expanse of boulders that occupies the axis of a small valley with approximately 100-foot (30 m) of relief. [6]

  6. Trap rock - Wikipedia

    en.wikipedia.org/wiki/Trap_rock

    Vast areas of trap rock in the form of thick lava flows and other volcanic rocks comprise the Deccan Traps of India and Siberian Traps of Russia. [6] Other prominent basalt ridges, mountains, buttes, canyons, and other landscape features include: In North America: The ridges and cliffs of the Columbia River Gorge in Oregon and Washington.

  7. Geology of the Rocky Mountains - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Rocky_Mountains

    The granitoid rocks are mainly potassic granite and were derived principally from reworked older (3.1–2.8 Ga) gneiss. [3] During the Paleoproterozoic, island-arc terrane associated with the Colorado orogeny accreted to the Wyoming Craton along the Cheyenne belt, a 500-km-wide belt of Proterozoic rocks named for Cheyenne, Wyoming.

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