Oddi wrth Wicipedia, y gwyddoniadur rhydd.
	    
	    	    	    
	    Gall y ffeil hon gael ei defnyddio gan nifer o brosiectau eraill.
| Description | Northern hemisphere glaciation during the last ice ages. The set up of 3 to 4 km thick ice sheets caused a sea level lowering of about 120 m. Also the Alps and the Himalya were covered by glaciers. The limit of winter sea ice coverage was much more to the south. | 
| Source | own work; redrawn, supplemented and modified from a grafic of the United States Geological Survey | 
| Date | 2000-04-07 | 
| Author | Hannes Grobe 23:06, 21 July 2006 (UTC), Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany | 
| Permission | Own work, share alike, attribution required (Creative Commons CC-BY-SA-2.5) | 
| Other versions | in French : Image:Northern_icesheet-fr.png http://pubs.usgs.gov/gip/continents/map.jpg
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| I, the author of this work, hereby publish it under the following license: | 
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