Theropod dinosaurs from the Albian–Cenomanian Wayan Formation of eastern Idaho

Krumenacker, L. J.; Simon, Dragana; Scofield, Garrett Benson; Varricchio, David J.

doi:10.1080/08912963.2015.1137913

Cited by 20 publications

(22 citation statements)

References 40 publications

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“…Thus, these formations were compared due to their similar paleoenvironments and ages (Table 6 of Appendix 1). Although these formations are not as well-known as those from the Cenomanian (e.g., Krumenacker et al, 2017), the majority share the presence of iguanodonts and ankylosaurs. Genus level comparisons of these formations' faunas yielded low values for both the Simpson similarity index and Jaccard coefficient, yet family level comparisons yielded a mediumhigh (50-70%; 0.5-0.7) Simpson similarity index value between the faunas of the Dakota and Wayan formations (Tables 7-10 (Tables 7-10 of Appendix 1).…”

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 97%

“…Albian Dinosaur Faunas. The Dakota Formation is late Albian to early Cenomanian in age (e.g., Joeckel et al, 2004;Koch, 2007) and was compared with the similarly-aged Wayan, Blackleaf, and Willow Tank formations of the western United States (Varricchio et al, 2007;Bonde et al, 2012;Ullman et al, 2012;Krumenacker et al, 2017). The Wayan Formation of Idaho was found to be deposited between 101.8 and 95.5 Ma by Krumenacker (2010), who reviewed the formation's stratigraphy.…”

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

“…Although the Paluxy is middle Albian in age (112.2-106 Ma) (Jacobs and Winkler, 1998;D'Emic, 2013) and the Dakota, Wayan, Blackleaf and Willow Tank formations were deposited in the late Albian to early Cenomanian (e.g., Liggett, 2005;Varricchio et al, 2007;Bonde et al, 2012;Krumenacker et al, 2017), the scarcity of dinosaurbearing deposits from this time in North America and the relatively well-documented state of the Paluxy Formation fauna warranted statistical comparison between it and the faunas of the other aforementioned sedimentary units. Genus level similarity for both indices used was 0.0 between the Paluxy and all other formations, whereas family-level comparisons resulted in low Simpson similarity index and Jaccard coefficient values between the Paluxy fauna and those of all other formations save for the Dakota (Tables 7-10 of Appendix 1).…”

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

“…The Willow Tank Formation has been found to be between 98.5 and 98.1 million years old (e.g., Fleck, 1970;Troyer et al, 2006;Bonde et al, 2012), and the Blackleaf Formation has been dated to the late Albian and early Cenomanian (e.g., Dorr, 1985;Varricchio et al, 2007;Ullman et al, 2012). All of these western formations have been considered as overlapping in age (e.g., Bonde et al, 2012; figure 2 in Krumenacker et al, 2017). The Dakota Formation in southeastern Nebraska has been interpreted as representing fluvial to estuarine environments (e.g., Joeckal et al, 2004), whereas the Dakota Formation in Kansas has been interpreted as a coastal plain (e.g., Eaton, 1960), and the Blackleaf, Wayan, and Willow Tank formations all seemingly represent fluvialdeltaic environments (e.g., Kirkland et al, 1999;Bonde et al, 2008;Ullman et al, 2012;Krumenacker et al, 2017).…”

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

“…All of these western formations have been considered as overlapping in age (e.g., Bonde et al, 2012; figure 2 in Krumenacker et al, 2017). The Dakota Formation in southeastern Nebraska has been interpreted as representing fluvial to estuarine environments (e.g., Joeckal et al, 2004), whereas the Dakota Formation in Kansas has been interpreted as a coastal plain (e.g., Eaton, 1960), and the Blackleaf, Wayan, and Willow Tank formations all seemingly represent fluvialdeltaic environments (e.g., Kirkland et al, 1999;Bonde et al, 2008;Ullman et al, 2012;Krumenacker et al, 2017). Thus, these formations were compared due to their similar paleoenvironments and ages (Table 6 of Appendix 1).…”

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

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The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

Brownstein¹

2018

Palaeontol Electron

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The Cenomanian to Maastrichtian of the Late Cretaceous saw the flooding of the interior of North America by the Western Interior Seaway, which created the eastern landmass of Appalachia and the western landmass of Laramidia. Though Appalachian dinosaur faunas are poorly known, they are nevertheless important for understanding Cretaceous dinosaur paleobiogeography and ecology. In order to better track the vicariance of eastern and western North American dinosaur faunas over the duration of the Cretaceous, the former were compared with the latter from the Aptian to Maastrichtian Stages of the Late Cretaceous using several similarity indices. The data gathered from biogeographic similarity indices suggest that an almost completely homogenous North American dinosaur fauna found in the Early Cretaceous experienced significant vicariance, splitting into a Laramidian fauna differentiated by the presence of ceratopsids, pachycephalosaurids, saurolophids, lambeosaurines, ankylosaurids, therizinosaurids, and troodontids and an Appalachian fauna characterized by the lack of the aforementioned groups and the presence of non-hadrosaurid hadrosauroids, massive hadrosauroids, basal hadrosaurids, leptoceratopsians, "intermediate"-grade tyrannosauroids, and nodosaurids between the Cenomanian and Campanian, with these two faunas later experiencing limited dispersal after the disappearance of the Western Interior Seaway from the American Interior during the Maastrichtian. Dinosaur provincialism and ecology on Appalachia are also investigated and discussed.

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Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 97%

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

Section: Aptian Dinosaur Faunas Because the Arundelmentioning

confidence: 99%

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The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

Brownstein¹

2018

Palaeontol Electron

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An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

Noto

Drumheller

Adams

et al. 2019

The Anatomical Record

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New discoveries at the Arlington Archosaur Site (AAS), a Cenomanian (Late Cretaceous) locality in north‐central Texas, are filling gaps in our knowledge of mid‐Cretaceous Appalachian ecosystems, which remain poorly characterized. The AAS is notable because it preserves a diverse crocodyliform record. As seen in other sites that preserve four or more crocodyliform taxa, the species present at the AAS exhibit different snout shapes and body sizes, indicating that this high diversity of sympatric species was likely sustainable due to niche partitioning. Here we describe Scolomastax sahlsteini gen. et sp. nov., a new species of crocodyliform from the AAS, currently known from a partial right mandibular ramus. This species differs from other crocodyliforms in possessing features associated with durophagy or omnivory, including a shortened mandible, reduced tooth count, heterodonty, a dorsally expanded surangular, and enlarged attachments for jaw adductor muscles. Our phylogenetic analysis places this new taxon within Eusuchia as a member of Paralligatoridae and sister taxon to Paralligator gradilifrons. Scolomastax sahlsteini extends the record of paralligatorids into the Late Cretaceous of North America. This discovery represents the first appearance of this clade on the poorly known landmass of Appalachia, supporting a biogeographic connection between North America and Asia in the Early Cretaceous prior to completion of the Western Interior Seaway. However, relationships among other endemic crocodyliforms and tree instability within Paralligatoridae suggest further analysis is needed to resolve phylogenetic and biogeographic relationships (http://zoobank.org/urn:lsid:zoobank.org:pub:DC114471-6687-4BB5-8FAE-96F7278B1DAF). Anat Rec, 303:801–812, 2020. © 2019 Wiley Periodicals, Inc.

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A highly pneumatic middle Cretaceous theropod from the British Lower Greensand

Barker

Naish

Clarkin

et al. 2020

Papers in Palaeontology

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A series of axial elements from the Aptian Ferruginous Sands Formation of the Lower Greensand Group, discovered on the foreshore near Knock Cliff on the Isle of Wight, UK are (bar some isolated teeth and fragmentary postcranial material from the Cenomanian Cambridge Greensand) the youngest non-avian theropod remains reported from the British Mesozoic. These specimens have the potential to shed light on a poorly known section of the European dinosaur record. Consistency in size, appearance and adhering matrix indicates that the vertebrae belong to the same individual. This was a mid-sized tetanuran, the presence of several diagnostic characters indicating that it should be recognized as a new taxon, herein named Vectaerovenator inopinatus. The cervical and dorsal vertebrae are camerate and highly pneumatic. Tetanuran features include opisthocoelous cervicals and pneumatic foramina located within fossae; however, assigning this specimen to a specific clade is problematic. Within Tetanurae, Vectaerovenator possesses axial structures and homoplastic features seen in megalosauroids, carcharodontosaurians and certain coelurosaurs. Not only is Vectaerovenator one of the UK's youngest non-bird dinosaurs, and one of few valid British Greensand taxa, it is also the first diagnosable theropod taxon to be named from Aptian deposits of Europe.

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Theropod dinosaurs from the Albian–Cenomanian Wayan Formation of eastern Idaho

Cited by 20 publications

References 40 publications

The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

A highly pneumatic middle Cretaceous theropod from the British Lower Greensand

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