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Grey dunes are formed when pioneer species inhabit embryo dunes and begin a successional process toward dune stabilization and soil formation. Pioneer plants capture saltating sand grains carried by the wind and deposit them to continue build up the dune. Grey dunes are then formed after the root structures of pioneering plants stabilize foredunes.
Fixed crescentic dunes that form on the leeward margins of playas and river valleys in arid and semiarid regions in response to the direction (s) of prevailing winds, are known as lunettes, source-bordering dunes, bourrelets and clay dunes. They may be composed of clay, silt, sand, or gypsum, eroded from the basin floor or shore, transported up ...
The green-grey bands are thought to be caused by a change in the oxidation rate due to circulating groundwater [1] or bleaching by acidic groundwater. [ 11 ] The lithology of the lighter and darker red shales at the Cheltenham Badlands site is categorized as smectite -poor, due to the clay content, ranging from 58% to 68% clay, and the dominant ...
Athabasca sand dunes and vicinity aerial view. Athabasca Sand Dunes Provincial Park was created to protect the Athabasca sand dunes, a unique boreal shield ecosystem located in the far-northwest part of the Northern Saskatchewan Administration District. [1] The Athabasca sand dunes are one of the most northerly active sand dune formations on ...
The Sudbury Basin formed as a result of an impact into the Nuna supercontinent from a bolide approximately 10–15 km (6.2–9.3 mi) in diameter that occurred 1,849 million years ago [10] Sudbury Basin is the third-largest crater on Earth, after the 300 km (190 mi) Vredefort impact structure in South Africa , and the 150 km (93 mi) Chicxulub ...
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Carcross Desert is commonly referred to as a desert, but is actually a series of northern sand dunes. [2] The area's climate is too humid to be considered a true desert. [3] The sand was formed during the last glacial period, when large glacial lakes formed and deposited silt. When the lakes dried, the dunes were left behind. [2]
Spruce Woods Provincial Park is located in south-central Manitoba, Canada where the Assiniboine River passes through the delta of sediment left by the last glaciation. [2] An area of open and stabilized sand dunes within the park provides habitat to species of plants and animals not found elsewhere in Manitoba. [2]