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Weathering is the deterioration of rocks, soils and minerals (as well as wood and artificial materials) through contact with water, atmospheric gases, sunlight, and biological organisms. It occurs in situ (on-site, with little or no movement), and so is distinct from erosion, which involves the transport of rocks and minerals by agents such as ...
LaBarge Rock in Chouteau County, Montana (occasionally referred to as La Barge Rock) is a dramatic landform in the shape of a large rock column or pillar, rising 150 feet (46 m) from waters' edge of the Missouri River. It was named in honor of Captain Joseph LaBarge, a steamboat captain who cruised the Missouri River in the mid nineteenth century.
Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. The term serves as an umbrella term for a variety of processes, such as frost shattering, frost wedging, and cryofracturing. The process may act on a wide range of spatial and temporal scales, from ...
Honeycomb weathering, also known as honeycombs, honeycombed sandstone, is a form of cavernous weathering that consists of regular, tightly adjoining, and commonly patterned cavities that are developed in weathered bedrock; are less than 2 cm (0.79 in) in size; and resemble a honeycombed structure. Honeycombs also been called alveoli, lacework ...
Quarter for scale. A clastic dike is a seam of sedimentary material that fills an open fracture in and cuts across sedimentary rock strata or layering in other rock types. Clastic dikes form rapidly by fluidized injection (mobilization of pressurized pore fluids) or passively by water, wind, and gravity (sediment swept into open cracks).
June 15, 1970. The Union Covered Bridge State Historic Site is a Missouri State Historic Site in Monroe County, Missouri. The covered bridge is a Burr-arch truss structure built in 1871 over the Elk Fork of the Salt River. It was almost lost to neglect in the 1960s, but was added to the state park system in 1967, the same year it was damaged by ...
October 15, 1966 [1] Designated NHL. July 19, 1964 [2] Research Cave, also known as the Arnold Research Cave and the Saltpetre Cave, and designated by the Smithsonian trinomial 23CY64, is a major Native American archaeological site near Portland, Missouri. [1] Investigation of the site has uncovered evidence of human habitation as far back as ...
Meramec Caverns is the collective name for a 4.6-mile (7.4 km) cavern system in the Ozarks, near Stanton, Missouri. [1] The caverns were formed from the erosion of large limestone deposits over millions of years. Pre-Columbian Native American artifacts have been found in the caverns. Currently the cavern system is a tourist attraction, with ...