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Mima mounds are found in northwest Baja California and adjacent San Diego County, where again they are an integral part of vernal pools' landscape. [7]Mima mounds occur outside the western coastal North America in three major regions between the Cascade Range, the Sierra Nevada, and the Sierra de Juárez in the west, and the Mississippi River in the east.
A mound complex which includes mounds, a geometric enclosure and numerous habitation areas, it is the largest group of Middle Woodland mounds in the United States. The complex covers approximately 400 acres (1.6 km 2) and contains at least 30 mounds, 17 of which have been identified as being completely or partially constructed by prehistoric ...
The Grave Creek Mound in the Ohio River Valley in West Virginia is one of the largest conical-type burial mounds in the United States, now standing 62 feet (19 m) high and 240 feet (73 m) in diameter. [3] The builders of the site, members of the Adena culture, moved more than 60,000 tons of dirt to create it about 250–150 BC.
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A frost boil, also known as mud boils, a stony earth circles, frost scars, or mud circles, [1] are small circular mounds of fresh soil material formed by frost action and cryoturbation. They are found typically found in periglacial or alpine environments where permafrost is present, and may damage roads and other man-made structures. [2]
Tim Becker, horticulture director for the Theodore Payne Foundation, said he tested the soil in his West Adams yard a few years ago and discovered it had lead concentrations of around 65 parts per ...
Some of the mounds are 3 m (10 ft) tall and 10 m (33 ft) wide, and they are spaced about 20 m (66 ft) apart. Underneath the mounds are networks of tunnels that required the excavation of 10 cubic kilometres (2.4 cu mi) of dirt. Scientists performed radioactive dating on 11 mounds. The youngest mound was 690 years old.
In the archaeology of the United States and Canada, a mound is a deliberately constructed elevated earthen structure or earthwork, intended for a range of potential uses.In European and Asian archaeology, the word "tumulus" may be used as a synonym for an artificial hill, particularly if the hill is related to particular burial customs.