sorted circle
Link: http://w3id.org/permafrost/v/ipaglossary/t0310
Within: IPA Permafrost Glossary
Definition: A sorted circle is a patterned ground form that is equidimensional in several directions, with a dominantly circular outline, and a sorted appearance commonly due to a border of stones surrounding a central area of finer material.
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sorted circle
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Sorted circles occur singly or in groups; their diameter is commonly between 0.5 and 3.0 m. Their central areas have a concentration of fines, with or without stones. The stones of the borders surrounding the central areas tend to increase in size with the size of the circles. Tabular stones tend to stand on edge, with their long axes in the vertical plane parallel to the border.
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https://doi.org/10.4224/20386561
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