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- Omarolluk abstract "Omarolluks, sometimes shortened to "omars," are a distinctive type of glacial erratic that consists of dark siliceous greywacke and exhibits prominent rounded, often deep, hemispherical voids and pits. The hemispherical voids and pits result from the selective dissolution of carbonate concretions within the greywacke. The greywacke, of which Omars consist, is identifiable by its low metamorphic grade and the 10%–40% rock fragments, distinctive volcanic clasts, and spherical carbonate concretions that it contains. Omars are typically rounded and range in size from pebbles to boulders. Their rounded shape, whether found in glacial tills or glacial-fluvial (outwash) gravels, indicate that they were eroded from pre-existing littoral or fluvial deposits. Omars are typically found associated with granules and pebbles of oolitic jasper that were transported from the Belcher Islands in Hudson Bay, Canada.The name given these glacial erratics refer to their source, which is the Proterozoic Omarolluk Formation in the Belcher Islands in southeast Hudson Bay. The Laurentide Ice Sheet eroded omars from the Belcher Islands, an archipelago limited to only about a quarter of 1% of Hudson Bay. 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 came from they are very valuable in documenting the movement of glaciers.".
- Omarolluk thumbnail OmarPen.png?width=300.
- Omarolluk wikiPageID "24941985".
- Omarolluk wikiPageRevisionID "599085319".
- Omarolluk alt "An Omar with a hemispherical void. Note coin for scale.".
- Omarolluk boxbgcolor "604800.0".
- Omarolluk caption "An Omar with a hemispherical void in its side.".
- Omarolluk category "Native Minerals".
- Omarolluk hasPhotoCollection Omarolluk.
- Omarolluk name "Omar".
- Omarolluk subject Category:Sedimentology.
- Omarolluk type Abstraction100002137.
- Omarolluk type Material114580897.
- Omarolluk type Matter100020827.
- Omarolluk type Mineral114662574.
- Omarolluk type Part113809207.
- Omarolluk type PhysicalEntity100001930.
- Omarolluk type Relation100031921.
- Omarolluk type Substance100019613.
- Omarolluk type ChemicalSubstance.
- Omarolluk type Mineral.
- Omarolluk type ChemicalObject.
- Omarolluk type Thing.
- Omarolluk comment "Omarolluks, sometimes shortened to "omars," are a distinctive type of glacial erratic that consists of dark siliceous greywacke and exhibits prominent rounded, often deep, hemispherical voids and pits. The hemispherical voids and pits result from the selective dissolution of carbonate concretions within the greywacke.".
- Omarolluk label "Omarolluk".
- Omarolluk sameAs m.09gmh6k.
- Omarolluk sameAs Q7089890.
- Omarolluk sameAs Q7089890.
- Omarolluk sameAs Omarolluk.
- Omarolluk wasDerivedFrom Omarolluk?oldid=599085319.
- Omarolluk depiction OmarPen.png.
- Omarolluk isPrimaryTopicOf Omarolluk.
- Omarolluk name "Omar".