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About: North Horn Formation     Goto   Sponge   NotDistinct   Permalink

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

Type: yago:WikicatCretaceousPaleontologicalSitesOfNorthAmericageo:SpatialThingyago:GeographicalArea108574314yago:Location100027167yago:Object100002684yago:PhysicalEntity100001930yago:Region108630985yago:YagoGeoEntityyago:YagoLegalActorGeoyago:YagoPermanentlyLocatedEntityorganisationyago:Site108651247yago:Tract108673395 New Facet based on Instances of this Class

The North Horn Formation is a widespread non-marine sedimentary unit with extensive outcrops exposed in central and eastern Utah. The formation locally exceeds 3,600 feet (1,100 m) in thickness and is characterized by fluvial, lacustrine, and floodplain dominated systems, representing a terrestrial, high energy, depositional environment. The sediments date from Late Cretaceous (Maastrichtian) to early Paleocene in age and include the K-Pg extinction event boundary; however, this boundary is extremely difficult to locate and there is no strong stratigraphic evidence available that indicates a specific marker bed such as an iridium rich clay layer. Thus far, the only visible evidence is represented in the form of faunal turnover from dinosaur to mammal-dominated fossil assemblages. Taxa from