Early Upper Cambrian Faunas of Central Montana

Lochman, Christina; Duncan, Donald Cave

doi:10.1130/spe54-p1

Cited by 51 publications

(56 citation statements)

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“…In contrast, the work of Lochman and Duncan (1944) and the writer (Palmer, 1954) has shown that there is only a gradual evolutionary change from the faunas generally assigned to the older Cedaria zone to those generally assigned to the overlying Crepicephalus zone.…”

Section: Stratigraphic Significance Of Glyptagnostusmentioning

confidence: 98%

Glyptagnostus and associated trilobites in the United States

Palmer¹

1962

Professional Paper

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Section: Stratigraphic Significance Of Glyptagnostusmentioning

confidence: 98%

Glyptagnostus and associated trilobites in the United States

Palmer¹

1962

Professional Paper

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“…Blountia sp., LO12088t, Furongian, P. brevispina Zone at Vilske, Västergötland, Sweden. Scale bar represents 0.5 cm Laurentian occurrences of the genus are typically from upper Marjuman strata (Lochman and Duncan 1944;Rasetti 1965;Palmer and Peel 1981;Pratt 1992;Stitt and Perfetta 2000). Representatives of the genus were noted also in Australia in correlatable strata (Öpik 1967).…”

Section: Remarks: the Cranidia At Hand Fit All The Features Ofmentioning

confidence: 99%

“…(Lochman and Duncan 1944;Pratt 1992), but the specimen differs in having slightly larger preocular fixigenae and a less arcuate anterior border furrow.…”

Section: Remarks: the Cranidia At Hand Fit All The Features Ofmentioning

confidence: 99%

“…Family Kingstoniidae Kobayashi, 1933 Subfamily Blountiinae Lochman in Lochman andDuncan, 1944 Genus Blountia Walcott, 1916Walcott, emended Öpik, 1967 TYPE SPECIES: Blountia (Blountia) mimula Walcott, 1916, from the Middle Cambrian of Tennessee, USA, OD (see Öpik 1967 for discussion on the genus and the subgeneric assignment).…”

Section: Remarks: the Cranidia At Hand Fit All The Features Ofmentioning

confidence: 99%

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Exotic trilobites from the uppermost Cambrian Series 3 and lower Furongian of Sweden

Żylińska¹,

Weidner²,

Ahlgren³

et al. 2015

Acta Geologica Polonica

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ABSTRACT:Żylińska, A., Weidner, T., Ahlgren, J. and Ahlberg, P. 2015. Exotic trilobites from the uppermost Cambrian Series 3 and lower Furongian of Sweden. Acta Geologica Polonica, 65 (1), 21-67. Warszawa.Seventeen taxa of exotic trilobites representing eight families are described from the olenid-and agnostoid-dominated strata of the uppermost Cambrian Series 3 and lower Furongian alum shale facies of Sweden and from glacial erratic boulders of Denmark. Only five taxa are assigned to species level, i.e., Maladioidella abdita (Salter, 1866), Olentella rara (Westergård, 1922), Pedinocephalus peregrinus (Henningsmoen, 1957), Ptychoparia pusilla (Westergård, 1922), and Westergaardella olenorum (Westergård, 1922), whereas the others are left under open nomenclature or remain unrecognized. Most are described for the first time from the Cambrian of Scandinavia. Their affinities point to a strong connection with East Gondwana, Laurentia, Kazakhstania and Siberia. Exotic trilobites appear in the succession directly after periods of very low oxygen concentration in the Alum Shale Sea; their occurrences correspond to the ranges of agnostoid arthropods in the succession and seem to be linked to global transgressive events causing an influx of cool and/or oxygen-depleted waters onto the shelf of the Baltica palaeocontinent.

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“…Since then various other geologists have reported on specific geologic subjects (Schafer, 1935;Deiss, 1936;Lochman and Duncan, 1944;Catanzaro and Kulp, 1964).…”

Section: General Geologymentioning

confidence: 99%