omar
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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.
sostantivo
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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 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 [...]
[…] 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 [...]
[...] Omarolluk Formation serves to distinguish omars from wacke clasts derived [...] an omar dispersal "limit" in Northern Ontario is difficult to reconcile [...]
[...] 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 [...]
Etimologia
From the Proterozoic Omarolluk Formation in the Hudson Bay, where they originated.
Forme
- plurale
- omars
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