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About: Portland Formation     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Tract108673395, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thinggeo:SpatialThingyago:GeographicalArea108574314yago:Location100027167yago:Object100002684yago:PhysicalEntity100001930yago:Region108630985yago:WikicatJurassicPaleontologicalSitesOfNorthAmericayago:YagoGeoEntityyago:YagoLegalActorGeoyago:YagoPermanentlyLocatedEntitymilitary unityago:Site108651247yago:Tract108673395 New Facet based on Instances of this Class

The Portland Formation is a geological formation in Connecticut and Massachusetts in the northeastern United States. It dates back to the Early Jurassic period. The formation consists mainly of sandstone laid down by a series of lakes (in the older half of the formation) and the floodplain of a river (in the younger half). The sedimentary rock layers representing the entire Portland Formation are over 4 kilometres (2.5 mi) thick and were formed over about 4 million years of time, from the Hettangian age (lower half) to the late Hettangian and Sinemurian ages (upper half).