The Edmontonian was a North American faunal epoch occurring during the Late Cretaceous, lasting from approximately 70 to 68 million years ago.
Paleobiogeography
In southern North America, little changed in the transition from the
Judithian to the Edmontonian.
However, the northern
biome experienced a general trend in reduction of
, with leaving
Pachyrhinosaurus as one of the few surviving species.
Likewise among
, only the single genus
Hypacrosaurus remained.
Inland faunas of the age are distinguished by a
Saurolophus-
Anchiceratops association while more coastal areas were characterized by
Pachyrhinosaurus and
Edmontosaurus.
occurred as far north as Alaska.
"Archaic" elements such as
like
Parksosaurus and the "(re)appearance" of basal neoceratopsians like
Montanoceratops begin characterizing inland faunas.
Thomas M. Lehman described the Edmontonian
Arrhinoceratops as a likely ancestor for the
Lancian Triceratops.
Ecological disturbance brought them to an end during the Edmontonian.
Footnotes
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Lehman, T. M., 2001, Late Cretaceous dinosaur provinciality: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 310–328.
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