Late Cretaceous strata and vertebrate fossils of North Texas

Jacobs, Louis L.; Polcyn, Michael J.; Winkler, Dale A.; Myers, Timothy S.; Kennedy, Jamell G.; Wagner, John B.

doi:10.1130/2013.0030(01)

Cited by 8 publications

(11 citation statements)

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“…Significantly, this is inconsistent with previous accounts of SMU SMP 69120 (e.g. Carpenter, 1997 and later papers), which usually ascribe the type specimen to Turonian strata but without justification (see Jacobs et al 2013). We therefore suggest that SMU SMP 69120 might alternatively be late Cenomanian (early Late Cretaceous) in age, pending a detailed stratigraphical reassessment of the type locality.…”

Section: Systematic Palaeontologycontrasting

confidence: 72%

“…of Texas, 1981). McGowen et al (1987) included this outcrop area within the Eagle Ford Group (their Eagle Ford Formation), although recent site surveys refer it to the Britton Formation (Jacobs et al 2013), which constitutes the lower section of the Eagle Ford Group sequence (Dawson, 2000). In his unpublished thesis, Storrs (G. W. Storrs, unpub.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

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Postcranium of the paradigm elasmosaurid plesiosaurianLibonectes morgani(Welles, 1949)

Sachs¹,

Kear

2014

Geol. Mag.

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Elasmosauridae constitutes one of the most immediately recognizable plesiosaurian radiations. Their distinctive body plan represents the popular model for Plesiosauria, and is typified by an osteological morphology especially adapted for hyper-elongation of the neck. Nevertheless, many archetypal elasmosaurids are known only from incomplete and/or inadequately documented material, a problem that has contributed to their uncertain intra-clade relationships. A prime example of this is Libonectes morgani from the Upper Cretaceous of Texas, USA, which is frequently presented as an elasmosaurid structural proxy because of its three-dimensionally preserved holotype skull. Perplexingly though, both the taxonomic diagnosis and phylogenetic placement of L. morgani rely primarily upon the cervical vertebrae, together with the pectoral girdle and forelimb, yet most of these elements are now lost and figured only as line drawings. We therefore reviewed the remnant postcranial skeleton of L. morgani first-hand with the objective of clarifying its defining character states. Our observations showed that the existing diagnosis of L. morgani is indeed inadequate. Moreover, the only identifiable autapomorphies occurred within the axial skeleton. This concurred with an examination of character scores used in published plesiosaurian phylogenies, and highlights the persistent significance of postcranial elements for discriminating elasmosaurid taxa.

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Section: Systematic Palaeontologycontrasting

confidence: 72%

Section: Systematic Palaeontologymentioning

confidence: 99%

Postcranium of the paradigm elasmosaurid plesiosaurianLibonectes morgani(Welles, 1949)

Sachs¹,

Kear

2014

Geol. Mag.

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“…Terrestrial deposits are marked by stippled regions. Modified from Winkler et al, and Jacobs et al, . ( B ) Generalized map of geologic units in the Fort Worth Basin, showing enlarged area from white box of inset map of Texas.…”

Section: Geologic Settingmentioning

confidence: 99%

“…In North America, rich terrestrial fossil localities are largely concentrated during either the Aptian and Albian, during the Lower Cretaceous, or the Campanian and Maastrichtian, during the Upper Cretaceous, which leaves a stretch of roughly 20 million years for which few fossils are known (Jacobs and Winkler, ; Weishampel et al, ; Zanno and Makovicky, ). Furthermore, what fossils have been described during this period of time are largely concentrated on the western landmass of Laramidia, leaving Appalachia, to the east of the Western Interior Seaway, poorly understood (Krumenacker et al, ; Prieto‐Márquez et al, ; Ullmann et al, ).…”

Section: Geologic Settingmentioning

confidence: 99%

“…The Woodbine Formation in north‐central Texas preserves a rare Cenomanian (95–100 Ma) ecosystem from the southwestern corner of the ancient landmass of Appalachia. A rich diversity of vertebrate taxa from the Woodbine Formation have been described to date, including dinosaurs (the hadrosauroid Protohadros , a nodosaurid, at least four theropods, and the enantiornithine bird Flexomornis ), neosuchian crocodyliforms, turtles, multituberculate mammals, osteichthyan fish, and chondrichthyan fish (Head, ; Jacobs and Winkler, ; Lee, , ; Main, ; Main et al, ; McNulty and Slaughter, ; Noto, ; Tykoski and Fiorillo, ). Historically, the clade‐level assignment of taxa preserved within the formation was difficult to assess, largely because fossils, while common, are often found isolated, fragmented, disarticulated, and poorly preserved.…”

Section: Institutional Abbreviationsmentioning

confidence: 99%

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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 new pachyrhizodontid fish (Actinopterygii: Teleostei) from the Tarrant Formation (Cenomanian) of the Upper Cretaceous Eagle Ford Group in Texas, USA

London

Shimada

2020

Cretaceous Research

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Late Cretaceous strata and vertebrate fossils of North Texas

Cited by 8 publications

References 0 publications

Postcranium of the paradigm elasmosaurid plesiosaurianLibonectes morgani(Welles, 1949)

Postcranium of the paradigm elasmosaurid plesiosaurianLibonectes morgani(Welles, 1949)

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

A new pachyrhizodontid fish (Actinopterygii: Teleostei) from the Tarrant Formation (Cenomanian) of the Upper Cretaceous Eagle Ford Group in Texas, USA

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