Ribbed moraines

Ribbed moraines

A ribbed moraine (also called a Rogen moraine) is a type of moraine formed subglacially (i.e., below glaciers or ice sheets) looking similar to giant current ripples. Ribbed moraines occur in groups or "fields" and are oriented transverse to former ice flow. They are often associated with drumlins, the latter being oriented parallel to ice flow.

Their exact origin is a matter of debate. The main theories are:
* differential subglacial erosion by catastrophic release of meltwater
* ductile deformation of unfrozen sediments, either subglacial or proglacial
* brittle deformation of frozen sediments, either subglacial or proglacial

ee also

*Drumlin

External links

* [http://www.nr.gov.nl.ca/mines&en/geosurvey/publications/cr2005/marich.pdf Scientific paper about ribbed moraines (Marich et al., 2005)]
* [http://www.d.umn.edu/~meye0787/research.html More information about ribbed moraines]
* [http://www.sentex.net/~tcc/moraine.html Ribbed moraines formed by catastrophic subglacial meltwater floods]


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