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Omarolluks, usually referred to today in both general and scientific discourse as "omars," (a term coined by V.K. PRest in 1990 in response to a theory first advanced by Upham in 1896) are stones that have hemispherical bubbles in them. They were formed when round mineral bubbles of precipitation formed aroundsome kind of nucleus in fine-grained sediment before that sediment hardened into rock. When these mineral bubbles weathered out, they left the bubble-like holes. Visually, some say they resemble cupstones. J.A. Donaldson and V.K. Prest have specified criteria for identifying omars

According to current understanding, omars were formed only in the Belcher Islandsmarker, an archipelago limited to only about a quarter of 1% of Hudson Baymarker.

Glaciers moved omars from the southeastern part of Hudson Bay to central Canada and into the U.S. where they were deposited on moraines. Because scientists know precisely where they (probably) came from they are very valuable in documenting themovement of glaciers.

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