omar

plural omars

1. A glacial erratic piece of (typically smooth) dark siliceous greywacke that exhibits a hemispherical pit or hole (as a result of selective dissolution of carbonate concretions within the greywacke), originating in the Omarolluk Formation and carried by glaciers throughout Canada and the United States.

   Omarolluk Formation clasts ('omars') from the Belcher Islands in Hudson Bay, Canada (Prest, 1990).

   2017, John Menzies, Jaap van der Meer, Past Glacial Environments, page 700

   4 more examples

   […] Omarolluk Formation of the Belcher Islands and mapped their distribution (mostly for those erratics showing concretions or concretion pits) in Ontario and western Canada. The omars are widespread in northern Ontario and have been [...]

   1991, Current Research, page 137

   […] Omarolluk Formation , which outcrops throughout the eastern part of Hudson Bay. These "dark erratics" or "omars", have been used extensively as indicators of ice flow direction. Omars are common throughout the deposits of the [...]

   1997, Arkansas Archeological Survey Research Series, page 26

   [...] Omarolluk Formation serves to distinguish omars from wacke clasts derived [...] an omar dispersal "limit" in Northern Ontario is difficult to reconcile [...]

   2000, Géographie Physique et Quaternaire, volume 54, page 268

   [...] an omar, a distinctive kind of graywacke - dark gray, fine-grained sandstone with concretions of calcium carbonate. Omars range in dimension from the size of your fist to the size of your skull. Only one source is known : the Omarolluk [...]

   2005, Minnesota Conservation Volunteer, volume 68, page 24

1. IslamOmar bin al-Khattab, second Sunni Islamic caliph and a companion of Muhammad
2. A male given name from Arabic.

   Investigators probing gunman Omar Mateen’s massacre at least 49 people at a popular gay nightclub in Florida are trying to determine whether terrorism, homophobia or both pushed him over the edge.

   2016 June 12, Pete Williams, Tracy Connor, Erik Ortiz and Stephanie Gosk, “Gunman Omar Mateen Described as Belligerent, Racist and 'Toxic'”, in NBC News, archived from the original on 06 Dec 2025