Lochkovian Rugosa of Nevada

Pedder, A E H; Murphy, Michael A.

doi:10.1130/0-8137-2321-3.341

Cited by 6 publications

(4 citation statements)

References 14 publications

(22 reference statements)

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“…Recent efforts by A. E. H. Pedder and myself (Pedder & Murphy, 1997, 2003 to integrate the rugose coral biostratigraphy of Nevada with the global conodont zonation for the Pragian-early Emsian have been inhibited be- (Chlupáč & Oliver, 1989). **The early form of Klapper (1969) includes all morphs with the basal cavity reaching the posterior tip of the Pa element and with a sulcate blade; the early form of Lane & Ormiston (1979) equals E. irregularis Druce, 1971, G. nevadensis (Clark & Ethington, 1966), and E. sulcatus s. s. + Indicates distribution in more than one continent.…”

Section: Present Workmentioning

confidence: 98%

Pragian conodont zonal classification in Nevada, western North America

Murphy

2021

Spanish J. Palaeontol.

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A tripartite global zonal scale for the Pragian Stage (Devonian) was recommended by the Subcomission on Devonian Stratigraphy in 1989. Since that time, additions to the data on the two primary lineages used for the subdivision of the Pragian, Eognathodus and early Polygnathus, have shown: 1) that the Lochkovian-Pragian boundary criterion is useable as defi ned and is applicable on a global scale, but that the boundary-stratotype section in the Barrandian region of the Czech Republic has serious limitations as a reference section; 2) the criteria for the internal subdivision of the Pragian are not globally applicable; and 3) that the taxon that we have used in Nevada to mark the base of the Emsian is Polygnathus lenzi, whose range may be different from that of Australian P. dehiscens, the supposed criterion for the base of the Emsian. The problem of interregional correlation within the Pragian and with the base of the Emsian can be solved only by increasing our understanding of the evolutionary pathways within all lineages and to develop better standards of comparison with the aim of fi nding a few intra-Pragian interregional correspondences. This paper reviews the Pragian of Nevada and compares it with Alaska, Canada, eastern Australia, and central Europe and suggests a regional scale for use in the western North American Cordillera. Evolutionary stages within the Eognathodontidae plus the help of Pedavis and Icriodus make the best scale for Nevada. However, the subdivisions proposed here (irregularis-profunda Zone; profunda-brevicauda Zone; brevicauda-mariannae Zone; mariannae-lenzi Zone) are not the same as those of the SDS and cannot be applied on a global scale. The fi rst two are based on evolutionary appearances; the last two on the lowest occurrences of distinctive and widespread taxa in North America. One new genus, Masaraella (type species, Ozarkodina pandora Murphy, Matti & Walliser, 1981) and four new species, Masaraella epsilon, Masaraella riosi, Gondwania profunda, and Pedavis longicauda, are described.

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Section: Present Workmentioning

confidence: 98%

Pragian conodont zonal classification in Nevada, western North America

Murphy

2021

Spanish J. Palaeontol.

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“…Stone and Berdan (1984) noted that the Nevada ostracodes include both North American and Eurasian elements, with closest similarities to northwestern Canadian and eastern Alaskan faunas, the basis for the western North American Cordilleran Ostracode Province of Berdan (1990). The distribution of corals (Pedder and Murphy 1997) also accords with that shown The completeness of the BC II section, combined with intensive collecting from closely spaced levels, reveal transitional forms between the well-represented poracanthodid taxa. For example, some scales assigned to Gomphonchoporus hoppei (Fig.…”

Section: Discussionmentioning

confidence: 65%

Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A.

Burrow¹,

Murphy²,

Turner³

2023

PaleoBios

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“…However, the abundance and diversity of Pragian Rugosa were low following the end Lochkovian/early Pragian coral crisis (Oliver and Pedder, 1994), and early analyses of Pragian shelf-dwelling Rugosa of Nevada depended heavily on evidence provided by three families. In recent years, we have revised the systematics of these families extensively: Breviphyllidae (Pedder and Murphy, 1998;Oliver, 1998;Pedder, 2002), Papiliophyllidae (Pedder, 1998;Pedder and Murphy, 2003), and the Siphonophrentidae (Oliver, 1993a(Oliver, , 1998. We believe now (W. A. Oliver, personal commun., [2000][2001][2002] that: 1) EAR Siphon ophrentidae are not represented in the Great Basin Pragian faunas; 2) Great Basin Breviphyllidae and Papiliophyllidae are absent from Lower Devonian faunas east of the Transcontinental Arch; and 3) there is no need to continue to differentiate between a lower EAR and an upper OWR Great Basin Province, as was done previously (Oliver and Pedder, 1989;Pedder and Oliver, 1990).…”

Section: Faunal Provincialismmentioning

confidence: 99%

“…R ESULTS PRESENTED here stem from ongoing research towards integration of a conodont zonation applicable to western North America with revised systematics and stratigraphy of the Devonian Rugosa of Nevada. We have revised the Lochkovian Rugosa of the State (Pedder and Murphy, 1998) and more recently have revised Pragian and Emsian Breviphyllidae (Pedder, 2002) and Papiliophyllidae (Pedder and Murphy, 2003) of the same area. In the present work, seven Emsian species, assigned to five gen era, are described from Nevada (for map, see Fig.…”

Section: Introductionmentioning

confidence: 99%