Reopening the Mother's Day Quarry (Jurassic Morrison Formation, Montana) Is Yielding New Information

Schein, Jason P.; Poole, Jason C.; Schmidt, Richard W.; Rooney, Laura

doi:10.1130/abs/2019am-333256

Cited by 3 publications

(4 citation statements)

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“…The fossils will be prepared at the Academy of Natural Sciences in Philadelphia, and later stored at the Cincinnati Museum Center. Permits from the United States Department of the Interior Bureau of Land Management (permit numbers: MTM 109606, MTM 109606-e1, MTM 109606-e2, MTM 109606-e3, MTM 109606-e4) were issued to Schein et al (2019) in order to allow for excavation of fossils. A quarry map has yet to be made but locations of all fossils have been recorded with a surveyor’s transit.…”

Section: Methodsmentioning

confidence: 99%

Evidence of integumentary scale diversity in the late Jurassic Sauropod Diplodocus sp. from the Mother’s Day Quarry, Montana

Gallagher

Poole

Schein

2021

PeerJ

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The life appearance of dinosaurs is a hotly debated topic in the world of paleontology, especially when it comes to dinosaur integument. In the case of sauropods, however, the topic is harder to properly discuss due to the limited amount of fossilized skin impressions that have been discovered. Thus far, the fossil record of sauropod integument fossils include titanosaur embryos from Patagonia, possible keratinous diplodocid dorsal spines, track ways with foot impressions, and other isolated skin impressions found in association with sauropod body fossils. Several prominent integument fossils have been found at the Mother’s Day Quarry, located in the Bighorn Basin, Montana. These discoveries may bring new important information about diplodocids, specifically Diplodocus sp. Here we describe newly uncovered fossilized skin that gives evidence of scale diversity in the genus Diplodocus. The scales themselves represent tubercles, and exhibit various shapes including rectangular, ovoid, polygonal, and globular scales. The tubercles are small in size, the biggest of which only reach about 10mm in length. Considering how diverse the scale shapes are in such a small area of skin, it is possible that these distinct scale shapes may represent a transition on the body from one region to another: perhaps from the abdomen to dorsal side, or abdomen to shoulder. Based on analysis of extant integument and scale orientation of crocodilians, it is possible to hypothesize on the location of the integument relative to the body as well as the size and relative maturational status of the individual.

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Section: Methodsmentioning

confidence: 99%

Evidence of integumentary scale diversity in the late Jurassic Sauropod Diplodocus sp. from the Mother’s Day Quarry, Montana

Gallagher

Poole

Schein

2021

PeerJ

Self Cite

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“…An incomplete basibranchial plate of Paralbula casei represents the only member of Phyllodontidae in our sample. This taxon was named by Estes (1969) for a fragmentary basibranchial plate collected from the Maastrichtian of New Jersey, and it has since been confirmed from various Cretaceous localities in both Canada and the USA (Estes 1969;Schein et al 2011). Occurrences of P. casei outside of North America are rare, with the only known occurrence being from Ypresian (lower Eocene) deposits in the United Kingdom (Estes 1969).…”

Section: Ozero Localitymentioning

confidence: 99%

“…Remarks. Two species of Paralbula have a temporal range during the Late Cretaceous, including Paralbula casei Estes, 1969and Paralbula marylandica Blake, 1940(Estes 1969Schein et al 2011). According to Estes (1969), these species are readily differentiated by the ornamentation on their teeth.…”

Section: Figmentioning

confidence: 99%

Marine Fishes (Chondrichthyes, Holocephali, Actinopterygii) From the Upper Cretaceous (Campanian) Rybushka Formation Near Beloe Ozero, Saratov Oblast, Russia

Ebersole

Solonin

Cicimurri

et al. 2022

RIPS

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A diverse fish paleofauna occurs in the upper Campanian portion of the Rybushka Formation exposed near Saratov city in the Saratov Oblast, Russia. Twenty taxa have been identified, including two holocephalans (Ischyodus bifurcatus and Amylodon karamysh), twelve elasmobranchs (Synechodus sp., Cederstroemia sp., Cretalamna cf. C. borealis, C. cf. C. sarcoportheta, Archaeolamna kopingensis, Eostriatolamia segedini, E. venusta, Pseudocorax laevis, Squalicorax kaupi, Squalicorax morphotype 1, Squalidae indet., and Squatirhina sp.), and six teleosts (Pachyrhizodus sp., Saurocephalus lanciformis, Paralbula casei, Enchodus cf. E. dirus, E. cf. E. gladiolus, and E. petrosus). Many of these taxa are new to the Campanian fish record of Russia, and the assemblage demonstrates that there is significant taxonomic overlap between the Rybushka Formation paleofauna and that of North America.

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“…Class Osteichthyes Huxley, 1880 Subclass Actinopterygii (sensu Goodrich, 1930) Unranked Paralbula marylandica is the only smoothcrowned species to be reported in North America, but the stratigraphic range of this taxon is thus far only known to extend from the lower Paleocene to middle Eocene (Blake 1940;Estes 1969;Weems 1999;Schein et al 2011;Ebersole et al 2019). Paralbula stromeri is the only member of the genus known to have a range that extends into the upper Eocene (Priabonian), but this species has thus far only been confirmed from Egypt and the United Kingdom (Weiler 1929;Estes 1969).…”

Section: Infraclass Elasmobranchii Indetmentioning

confidence: 99%

Acta Geologica Polonica

Ebersole

Cicimurri

Stringer

2020

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The Oligocene (Rupelian) Byram Formation (Vicksburg Group) in Alabama, USA, is divided into three members, including (in ascending order) the Glendon Limestone, unnamed marl, and the Bucatunna Clay. The Oligocene marine units in Alabama have been historically under-investigated, but bulk samples recently obtained from Glendon Limestone Member exposures at site AWa-9 in Washington County yielded 20 unequivocal elasmobranch and teleost taxa. This surprisingly diverse paleofauna, based on isolated teeth, bones and otoliths, includes the new taxon, Gobiosoma? axsmithi sp. nov., as well as “Aetomylaeus” sp., Albula sp., Aplodinotus gemma Koken, 1888, Ariosoma nonsector Nolf and Stringer, 2003, Balistidae indet., Citharichthys sp., Myliobatoidei indet., Diretmus? sp., Hemipristis sp., Negaprion aff. N. gilmorei (Leriche, 1942), Pachyscyllium sp., Paralbula sp., Physogaleus sp., Preophidion meyeri (Koken, 1888), Sciaena pseudoradians (Dante and Frizzell in Frizzell and Dante, 1965), Sciaenops? sp., Sparus? elegantulus Koken, 1888, Sphyraena sp., and Syacium sp. Additional remains were recovered but could not be identified beyond undetermined Elasmobranchii or Teleostei. All these taxa represent first occurrences within the Glendon Limestone Member in Alabama, and the “Aetomylaeus” sp., Pachyscyllium sp., Paralbula sp., and Sciaenops? sp. specimens represent the first occurrences of each in the Oligocene of the Gulf Coastal Plain of the USA. We also report the first record of Oligocene Paralbula Blake, 1940 teeth, and the first occurrence of an Oligocene member of the Balistidae in the Western Hemisphere. This marine vertebrate assemblage indicates that the Glendon Limestone Member at site AWa-9 represented a subtropical to temperate, middle shelf paleoenvironment with a paleowater depth interpreted as 30–100 m.

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Reopening the Mother's Day Quarry (Jurassic Morrison Formation, Montana) Is Yielding New Information

Cited by 3 publications

References 0 publications

Evidence of integumentary scale diversity in the late Jurassic Sauropod Diplodocus sp. from the Mother’s Day Quarry, Montana

Evidence of integumentary scale diversity in the late Jurassic Sauropod Diplodocus sp. from the Mother’s Day Quarry, Montana

Marine Fishes (Chondrichthyes, Holocephali, Actinopterygii) From the Upper Cretaceous (Campanian) Rybushka Formation Near Beloe Ozero, Saratov Oblast, Russia

Acta Geologica Polonica

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