The Early OrdovicianBeothuka terranova (Radiolaria) faunal assemblage in western Newfoundland

Maletz, Jörg

doi:10.1007/bf02988380

Cited by 16 publications

(16 citation statements)

References 14 publications

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“…A comparison of the Spitsbergen material is made with Middle Ordovician radiolarian faunas from the Cow Head and Table Head Groups of western Newfoundland (Maletz 2007 a,b ; and unpublished data) to understand faunal composition and evolutionary changes, as well as comparability of SEM and transmitted light representations (Text‐fig. 2).…”

Section: The Spitsbergen Faunamentioning

confidence: 99%

“…It provided a number of distinct Upper Cambrian to Middle Ordovician radiolarian faunas (Won and Iams 2002; Won et al. 2005; Maletz and Bruton 2007; Maletz 2007 a, b ), showing the fast biostratigraphic changes of radiolarian faunas through time. The youngest of the faunas is from the Arienigraptus gracilis Biozone (Castlemainian 4).…”

Section: The Age Of the Proventocitum Procerulum Assemblagementioning

confidence: 99%

“…Material. 2 specimens mounted on glass slides, additional material from sample 2 (Maletz and Bruton 2007; Maletz 2007 a ) considered to belong to the same species.…”

mentioning

confidence: 99%

“…Remarks. Maletz (2007 a ) described the species in detail and illustrated the material from SEM photographs, based on material from the Cow Head Group of western Newfoundland. The material here discussed is difficult to compare as it is investigated with transmitted light only.…”

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confidence: 99%

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THE MIDDLE ORDOVICIANPROVENTOCITUM PROCERULUMRADIOLARIAN ASSEMBLAGE OF SPITSBERGEN AND ITS BIOSTRATIGRAPHIC CORRELATION

Maletz¹,

Bruton²

2008

Palaeontology

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The Proventocitum procerulum radiolarian assemblage from the Valhallfonna Formation of Spitsbergen is described for the first time in some detail from material investigated in transmitted light. A number of species are recognized in the well-preserved material, showing unexpected diversity. The age of the fauna is restricted to the early Darriwilian (Da1-2), based on comparison with precisely dated radiolarian assemblages from the Cow Head and Table Head Groups of western Newfoundland. Most species, however, are left in open nomenclature until additional material is available for SEM investigation. Inanigutta magnifica n. sp. is described as new.

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Section: The Spitsbergen Faunamentioning

confidence: 99%

Section: The Age Of the Proventocitum Procerulum Assemblagementioning

confidence: 99%

“…Material. 2 specimens mounted on glass slides, additional material from sample 2 (Maletz and Bruton 2007; Maletz 2007 a ) considered to belong to the same species.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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THE MIDDLE ORDOVICIANPROVENTOCITUM PROCERULUMRADIOLARIAN ASSEMBLAGE OF SPITSBERGEN AND ITS BIOSTRATIGRAPHIC CORRELATION

Maletz¹,

Bruton²

2008

Palaeontology

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“…The bifurcation is the same as in Protoentactinia sp. that is shown by Maletz (2007, fig. 3F) to have bifurcated branches.…”

Section: Systematic Paleontologymentioning

confidence: 85%

Earliest Arenig radiolarians from the Cow Head Group, Western Newfoundland

Won

Iams

2011

J. Paleontol.

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Radiolarians have been recovered from lowermost Arenigian rocks of the Cow Head Group in Gros Morne National Park, Newfoundland. Two new faunal assemblages include eight families, 13 genera, and 25 species. Among these, the family Neoaspiculumidae, the genus Neoaspiculum, and 11 species, Beothuka aitchisoni, B. grosmornensis, B. stougei, B.? stellata, Neoaspiculum cancellium, N. headense, N. transformum, N. laxum, N.? amplum, Proventocitum cylindricum, and P. piriforme, are new.This study elucidates the reason for the significant difference in species composition between pre-Arenigian and Arenigian radiolarian faunas. This difference does not appear to be due to mass extinction, but rather to phylogenetic evolution: most radiolarian families that flourished during pre-Arenig time were gradually but significantly reduced by the earliest Arenig. Characteristic features of the earliest Arenig assemblages that distinguish them from their Tremadocian predecessors are 1) the development of a distinctive skeletal constructional element referred to as “bandage” structure that evolved through modification of a mesh of thin bars and 2) the appearance of multiple concentric shells including a proloculus (or a microsphere), which developed from a primitive three-dimensionally interwoven meshwork or spongy shell wall. These forms, represented by beothukids, antygoporids, and inaniguttids, are rare but they appear to originate in the earliest Arenig. Transitional characteristics among those forms are developed in the Neoaspiculumidae, which flourished during the earliest Arenig.The precise biostratigraphic age of one of the assemblages was determined with the recovery of the index condont Prioniodus adami Stouge and Bagnoli, 1988 from strata belonging to the Tetragraptus approximatus Graptolite Zone, which is at the base of the Arenigian.

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Radiolarians

Jain¹

2019

Fundamentals of Invertebrate Palaeontology

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The Early OrdovicianBeothuka terranova (Radiolaria) faunal assemblage in western Newfoundland

Cited by 16 publications

References 14 publications

THE MIDDLE ORDOVICIANPROVENTOCITUM PROCERULUMRADIOLARIAN ASSEMBLAGE OF SPITSBERGEN AND ITS BIOSTRATIGRAPHIC CORRELATION

THE MIDDLE ORDOVICIANPROVENTOCITUM PROCERULUMRADIOLARIAN ASSEMBLAGE OF SPITSBERGEN AND ITS BIOSTRATIGRAPHIC CORRELATION

Earliest Arenig radiolarians from the Cow Head Group, Western Newfoundland

Radiolarians

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