Late Cretaceous (earliest Campanian/Maastrichtian) evolution of western shorelines of the North American Western Interior Seaway in relation to known mammalian faunas

1990 ◽  
pp. 1-30 ◽  
Author(s):  
Jason A. Lillegraven ◽  
Lawrence M. Ostresh
Keyword(s):  
Late Cretaceous ◽  
North American ◽  
Western Interior Seaway ◽  
The North ◽  
Mammalian Faunas

LATE CRETACEOUS EXHUMATION OF UNDERPLATED METASEDIMENTARY ROCKS IN THE NORTH AMERICAN CORDILLERA

2019 ◽  
Author(s):  
William A. Matthews ◽  
◽  
Marie-Pier Boivin ◽  
Kirsten Sauer ◽  
Daniel S. Coutts
Keyword(s):  
Late Cretaceous ◽  
North American ◽  
North American Cordillera ◽  
Metasedimentary Rocks ◽  
The North

scholarly journals Late Turonian-early Coniacian belemnites from western and central Europe

1982 ◽  
Vol 31 ◽  
pp. 63-79
Author(s):  
Walter Kegel Christensen
Keyword(s):  
Central Europe ◽  
Late Cretaceous ◽  
North American ◽  
Evolutionary Trends ◽  
Taxonomic Character ◽  
Central European ◽  
The North ◽  
The Family ◽  
Early Late

A little known fauna of late Turonian--early Coniacian belemnites from the Central European palaeobiogeographic Subprovince is revised and the following species are recognised: Actinocamax strehlensis (Fritsch & Schlonbach), A. bohemicus Stolley, A. paderbornensis Schliiter, and A. esseniensis n. sp. The taxonomic value of various characters within Late Cretaceous belemnites belonging to the family Belemnitellidae Pavlov is discussed, and it is concluded that the shape of the guard is a more significant taxonomic character than the presence of granules. The species from the subprovince are compared to coeval species from the Central Russian Subprovince and the North American Province. The palaeobiogeography and evolutionary trends of early Late Cretaceous belemnites are discussed.

scholarly journals An elongate hadrosaurid forelimb with biological traces informs the biogeography of the Lambeosaurinae

2020 ◽  
pp. 1-9
Author(s):  
Chase Doran Brownstein ◽  
Immanuel Bissell
Keyword(s):  
New Jersey ◽  
North America ◽  
Late Cretaceous ◽  
North American ◽  
American West ◽  
Atlantic Coastal Plain ◽  
Western Interior Seaway ◽  
Terrestrial Vertebrates ◽  
Both Bones ◽  
Atlantic Coastal

Abstract Although the fossil record of the Late Cretaceous eastern North American landmass Appalachia is poor compared to that from the American West, it includes material from surprisingly aberrant terrestrial vertebrates that may represent relictual forms persisting in relative isolation until the end of the Mesozoic. One intriguing question is to what extent eastern and western North American faunas interspersed following the closure of the Western Interior Seaway during the Maastrichtian Stage of the Late Cretaceous ca. 70 Ma. Isolated remains from the Atlantic Coastal Plain in New Jersey have been preliminarily identified as the bones of crested lambeosaurine hadrosaurids, a derived clade known from the Cretaceous of Asia, western North America, and Europe, but have not been formally described. We describe the partial forelimb of a large hadrosaurid from the late Maastrichtian New Egypt Formation of New Jersey. The ulna preserves multiple deep scores identifiable as shark feeding marks, and both bones show ovoid and circular marks attributable to invertebrates. This forelimb is very similar to another partial antebrachium from the same area that shows evidence of septic arthritis. Both these specimens and a complete humerus from the same unit are closely comparable to the lower forelimbs of lambeosaurines among hadrosaurid dinosaurs. Although the absence of lambeosaurine synapomorphies observable on the New Egypt Formation forelimbs precludes their definite referral to Lambeosaurinae, they show that a morphotype of large hadrosauromorph with distinctly elongate forelimbs existed in the latest Maastrichtian of eastern North America and allow for a revision of the latest Cretaceous biogeography of crested herbivorous dinosaurs.

Early Campanian Multituberculates (Mammalia: Allotheria) from the Upper Milk River Formation, Alberta

1971 ◽  
Vol 8 (8) ◽  
pp. 916-938 ◽  
Author(s):  
Richard C. Fox
Keyword(s):  
Late Cretaceous ◽  
North American ◽  
Upper Cretaceous ◽  
Sampling Error ◽  
Taxonomic Diversity ◽  
New Genus And Species ◽  
The North ◽  
Evolutionary Radiation ◽  
Mammalian Teeth ◽  
Milk River Formation

Mammalian teeth collected from the early Campanian Upper Milk River Formation, southernmost Alberta, document a hitherto unknown evolutionary radiation of Late Cretaceous ptilodontoid and taeniolabidoid multituberculates. New species of the ectypodontids Mesodma and Cimexomys, the ptilodontid Cimolodon, and the cimolomyid Meniscoessus are defined, and teeth possibly pertaining to a second species of Mesodma and two species of Cimolomys are described. A new genus and species with uncertain relationships to known multituberculate families, is tentatively classified in the Taeniolabidoidea. Among North American Late Cretaceous multituberculates, at least Mesodma, Cimexomys, Cimolodon, Cimolomys, and Meniscoessus are seen to be evolutionarily conservative during early Campanian to late Maestrichtian times. The effects of sampling error on relative taxonomic diversity at horizons in the North American Upper Cretaceous are discussed.

Notes on the dentition and relationships of the Late Cretaceous insectivore Gypsonictops Simpson

1977 ◽  
Vol 14 (8) ◽  
pp. 1823-1831 ◽  
Author(s):  
Richard C. Fox
Keyword(s):  
Late Cretaceous ◽  
North American ◽  
The North

The most nearly complete maxilla known of the North American Late Cretaceous insectivore Gypsonictops hypoconus Simpson 1927 is described. The specimen exhibits P3–4M1 in place; alveoli present anterior to P3 indicate a total of four upper premolars of which the first was single-rooted. Relationships between Gypsonictops and its presumed ancestor Kennalestes gobiensis Kielan-Jaworowska 1969 are discussed.

scholarly journals The Late Cretaceous belemnite family Belemnitellidae: Taxonomy and evolutionary history

1997 ◽  
Vol 44 ◽  
pp. 59-88
Author(s):  
W. K. Christensen
Keyword(s):  
Northern Hemisphere ◽  
Late Cretaceous ◽  
North American ◽  
Evolutionary History ◽  
The North ◽  
Northern European ◽  
Nomen Dubium ◽  
The Family

The Late Cretaceous belemnite family Belemnitellidae Pavlow, 1914 occurs only in the Northern Hemisphere and includes nine genera and two subgenera: Praeactinocamax Naidin, 1964b, Actinocamax Miller, 1823, Belemnocamax Crick, 1910, GonioteuthisBayle, lS7S,BelemnellocamaxNaidin, 1964b,Goniocamax Naidin, 1964b, Belemnitella d'Orbigny, 1840, Belemnella (Belemnella) Nowak, 1913, Belemnella (Pachybelemnella) Schulz, 1979, Belemnella (Neobelemnella) Naidin, 1975 and Fusiteuthis Kongiel, 1962. The latter is most likely a nomen dubium. Diagnoses of the genera and subgenera are provided. The origin of the family is poorly known. The number of genera and subgenera, fluctuated during the Late Cretaceous. It was one to two in the Cenomanian, increased gradually to a maximum of six in the Early Santonian, decreased gradually to one during most of the Late Campanian and increased to two or possibly three in the Maastrichtian. The belemnitellids occur in the North European and North American palaeobiogeographical Provinces of the North Temperate Realm, in additon to the northern European margin of the Tethyan Realm. The centre of evolution lay in the North European Province and all known genera and subgenera occur there. Species of five genera and two subgenera occur on the northern European margin of the Tethyan Realm and the majority of these are conspecific with species from the North European Province. Species of essentially two genera occur in the North American Province and these are endemic, with a few exceptions.

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