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The plants of the Hell Creek Formation generally represent angiosperm-dominated riparian forests of variable diversity, depending on stratigraphic position and sedimentary environment. There appears to be floral transitions visible on a stratigraphic range from the lower to the upper Hell Creek Formation.
The plants of the Hell Creek Formation generally represent angiosperm-dominated riparian forests of variable diversity, depending on stratigraphic position and sedimentary environment. There appears to be floral transitions visible on a stratigraphic range from the lower to the upper Hell Creek Formation.
The Hell Creek Formation is a well-known and much-studied fossil-bearing formation (geological region) of mostly Upper Cretaceous and some lower Paleocene rock that stretches across portions of Montana, North Dakota, South Dakota, and Wyoming in North America.
In the Hell Creek Formation, many types of plants were supported, primarily angiosperms, with less common conifers, ferns and cycads. An abundance of fossil leaves found at dozens of different sites indicates that the area was largely forested by small trees. [44]
When a type locality is listed as the site for a formation with many good outcrops, the site is flagged with a note ([Note 2]). When a particular site of note is listed for an extensive fossil-bearing formation, but that site is somehow atypical, it is also flagged with a note ([Note 3]).
Acheroraptor is the youngest species of dromaeosaurid, and is from the Hell Creek Formation. [1] The Hell Creek Formation is from the time of the Cretaceous-Paleogene Extinction Event, and has been dated to 66 ± 0.07 million years ago. [5] Many animals and plants have been found in the Hell Creek Formation, [6] the discovery site of Acheroraptor.
The type locality is the Hell Creek Formation at locality 6600 on the Cannonball River in North Dakota. [4]: 247 A syntype is held in the collections of the Smithsonian Institution. [5] Brown described S. dakotensis as a new species based on specimens of cones lacking natural attachment to any foliage.
Bodenheim Formation Germany. A flowering plant of uncertain phylogenetic placement. Cobbania hickeyi [94] Sp. nov Valid Stockey, Rothwell & Johnson Late Cretaceous (late Maastrichtian) Hell Creek Formation United States ( South Dakota) A member of Araceae. Cylindrocites [77] Gen. et sp. nov Valid Poinar Eocene-Miocene El Mamey Formation