Cambrian Stratigraphy and Trilobites of Northwestern Montana

Deiss, Charles

doi:10.1130/spe18-p1

Cited by 23 publications

(44 citation statements)

References 2 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The single specimen has suffered slight distortion and is insufficient to characterize a readily recognizable species. It is impossible to confidently clarify the status of Deiss' (1939) species without recollection and careful analysis of additional specimens from the type localities. Schwimmer (1973) recognized only two species:…”

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

“…Elrathina is one of the genera with a fairly generalized morphology, and since Resser's (1937b) rudimentary introduction and the rapid emendation by Deiss (1939), it has grown into one of the frequent taxonomic waste baskets among the Alokistocaridae, with at least 23 validly described species, or subspecies. The difficulties that result from the attempt to perfectly characterize the species' morphology when based on imperfectly preserved material have been addressed by Rasetti (1951, p. 221) in a surprisingly plain style.…”

Section: Genus Elrathina Resser 1937bmentioning

confidence: 99%

“…I. gaspensis, are new. All three genera co-occur, for example, in the Pentagon Shale-Pagoda Limestone interval in northwestern Montana, U.S.A. (Deiss, 1939), and the presence of two of the genera in association has been noted from most well-known coeval middle Cambrian localities of Laurentian North America, such as Utah (Robison, 1964), Idaho (Resser, 1939), the Grand Canyon region (McKee and Resser, 1945), British Columbia (Rasetti, 1951), Pennsylvania (Rasetti, 1965), Georgia (Schwimmer, 1989), New York (Bird and Rasetti, 1968), and Alaska (Palmer, 1968).…”

Section: Correlation and Biostratigraphymentioning

confidence: 99%

“…preglabellar field, and a prominent, moderately broad anterior border that grows considerably in width to the sagittal line. According to Deiss (1939), the surface is minutely punctate. The single specimen has suffered slight distortion and is insufficient to characterize a readily recognizable species.…”

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

“…The surface is covered by minute granules. Elrathina oculineata Deiss, 1939 from the Pentagon Shale of the Lick Creek section, Continental Divide, known from a single cranidium, has a strongly tapering glabella and distinct eye ridges, a moderately broad (sag.) preglabellar field, and a prominent, moderately broad anterior border that grows considerably in width to the sagittal line.…”

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

See 4 more Smart Citations

Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

Geyer¹,

Peel²

2016

J. Paleontol.

View full text Add to dashboard Cite

Abstract.-The richly fossiliferous Ekspedition Brae Formation of North Greenland yields a typical oligospecific fossil assemblage with well-preserved trilobites, helcionelloids, and lingulate brachiopods. The trilobites include Itagnostus subhastatus new species, Itagnostus sp. cf. I. gaspensis (Rasetti, 1948), Elrathina aphrodite new species, Elrathina athena new species, Elrathina hera new species, and Elrathia groenlandica new species-a fossil assemblage typical of the Bathyuriscus-Elrathina Zone as known from the Cordilleran regions of Laurentia. Excellent preservation allows a detailed assessment of the prosopon and elucidates aspects of the ontogenetic development of Elrathina and Elrathia. An evaluation of Elrathina includes a redescription of its type species, E. cordillerae (Rominger, 1887), based on the type material, and indicates that most specimens collected from the Burgess Shale and previously dealt with as E. cordillerae represent a new species.

show abstract

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

Section: Genus Elrathina Resser 1937bmentioning

confidence: 99%

Section: Correlation and Biostratigraphymentioning

confidence: 99%

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

Section: Geyer and Peel-middle Cambrian Trilobites From The Ekspeditimentioning

confidence: 99%

See 3 more Smart Citations

Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

Geyer¹,

Peel²

2016

J. Paleontol.

View full text Add to dashboard Cite

show abstract

Systematic, morphometric and palaeobiogeographic study of Blainia gregaria Walcott, 1916 (Trilobita, Ptychopariida), Middle Cambrian of the Precordillera of western Argentina

2012

View full text Add to dashboard Cite

The ptychoparioid trilobite Blainia gregaria Walcott, 1916 is described for the first time from the late middle Cambrian (Series 3) of the Argentine Precordillera. It occurs commonly in the upper part of La Laja Formation, a carbonate platform succession that crops out in the Precordillera Oriental of San Juan where it reaches a thickness of some 600 m. Sections were sampled on cerro Tres Marías in Sierra de Marquesado and in quebrada de Zonda at the northern termination of Sierra Chica de Zonda. More than 1200 specimens were recovered from 22 stratigraphic levels over a thickness of 155 m, located in the uppermost 15 m of the Soldano Member, the approximately 100 m thick Rivadavia Member, and in the lower 40 m of the Juan Pobre Member. Our biometric study dealt with 205 cranidia and 365 pygidia from cerro Tres Marías. Measured dimensions of a subset of this collection provide bivariate datasets that in some characters show broad scatter plots and relatively low linear correlation coefficients, indicative of rather wide intraspecific morphological variation. Six morphotypes (three cranidial and three pygidial), recognized mainly on the basis of shape, occur together in the same collections. This evidence for an unusually high degree of variability leads to a proposed synonymy of some 30 previously named species in North America belonging to two genera, Blainia Walcott, 1916 and Glyphaspis Poulsen, 1927, the latter considered a junior synonym. The biogeographic distribution of B. gregaria, as redefined here, shows that it was an endemic Laurentian species that inhabited the inner parts of the carbonate platform that rimmed the craton and mantled portions of its interior. Its presence in western Argentina is further evidence for the very close faunal relationship between the Precordilleran terrane, known as Cuyania, and Laurentia during the Cambrian.

show abstract

Cambrian trilobites from the Glossopleura walcotti Zone (Miaolingian Series, Wuliuan Stage) of Mendoza, western Argentina

Tortello

2021

J. Paleontol.

View full text Add to dashboard Cite

The Museo de La Plata houses numerous Miaolingian and Furongian fossils from the southern Precordillera of Mendoza, western Argentina, collected by Ángel V. Borrello during the 1960s. Early Miaolingian (Wuliuan) trilobites from these collections are described herein. The specimens studied come from allochthonous limestone blocks (San Isidro Olistoliths) of key fossiliferous localities of the San Isidro area (Cerro Martillo, Quebrada Oblicua, Quebrada Empozada, Quebrada San Isidro). Taxa comprise Athabaskia anax (Walcott), Glossopleura leona Lochman, Kootenia aff. K. incerta (Rusconi), Kootenia crassa Fritz, Oryctocephalites reynoldsi (Reed), Zacanthoides sp., Spencia? sp., Amecephalus normale? (Resser), Amecephalus laticaudum? (Resser), and Amecephalus sp. This assemblage is representative of the North American Glossopleura walcotti Zone, and closely allied to faunas from the Great Basin (Spence Shale), Sonora, and to a lesser extent from northwestern Idaho.

show abstract

Cambrian Stratigraphy and Trilobites of Northwestern Montana

Cited by 23 publications

References 2 publications

Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

Systematic, morphometric and palaeobiogeographic study of Blainia gregaria Walcott, 1916 (Trilobita, Ptychopariida), Middle Cambrian of the Precordillera of western Argentina

Cambrian trilobites from the Glossopleura walcotti Zone (Miaolingian Series, Wuliuan Stage) of Mendoza, western Argentina

Contact Info

Product

Resources

About