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[6] [7] The world's largest known opal-filled thunderegg, weighing 1.75 tons (1600 kg), is housed at the museum. [ 7 ] [ 28 ] The thunderegg is Oregon's state rock. [ 29 ] Other items include azurite , Oregon sunstone , amber, copper crystals, zeolites , morganite , and agate among others.
A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. [1] Thundereggs are rough spheres , most about the size of a baseball —though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across.
Even though the area has been worked by rockhounds for many years, quality thundereggs are still found at the site. There are also some rare rocks and minerals in central Oregon in or near the Ochoco Mountains, including opals, amethyst, gem quality calcite, cinnabar, selenite, gypsum, and amygdaloid nodules. [18] [19]
This list of botanical gardens and arboretums in Oregon is intended to include all significant botanical gardens and arboretums in the U.S. state of Oregon. [1] [2] [3]
Petersen Rock Garden is open every day from 9 a.m. until closing time, which varies depending on the season. [11] Admission was $4.50 for adults, at self-pay stations, as of 2009. [3] It is not a member of the Oregon Museums Association. [12] The price had increased to $6 by 2016. [13]
Map of the United States with Oregon highlighted. Oregon is a state located in the Western United States. All population data is based on the 2020 census and 2010 census and the Census Bureau's annual estimates. [1] All area data is based on the 2010 US Gazetteer files. There are 241 municipalities.
Mill Creek Wilderness is a wilderness area located in the Ochoco National Forest of central Oregon.It was established in 1984 and comprises 17,400 acres (7,040 ha). [1] Of the three wilderness areas in the Ochoco National Forest - Mill Creek, Bridge Creek, and Black Canyon - Mill Creek is the largest and most heavily used.
Twin Rocks is an unincorporated community in Tillamook County, Oregon, United States, on the Oregon Coast. Twin Rocks, founded as a summer resort community, was named for two offshore rocks, 100 feet (30 m) high, in the Pacific Ocean. [2] Twin Rocks post office was established in 1914, with William E. Dunsmoor as the first postmaster. [2]