The conodont <i>Iapetognathus</i> and its value for defining the base of the Ordovician System

Miller, James F.; Repetski, John E.; Nicoll, Robert S.; Nowlan, Godfrey S.; Ethington, Raymond L.

doi:10.1080/11035897.2013.862851

Cited by 26 publications

(34 citation statements)

References 5 publications

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“…Miller et al . , , ). Based on very extensive collections, three Cordylodus zones have been identified in the uppermost Cambrian, and three zones, including the basalmost Ordovician Iapetognathus Zone, have been recognized in the lowermost Tremadocian (Fig.…”

Section: The Modern Periodmentioning

confidence: 99%

“…The GSSP of the base of the Ordovician, which is located at Green Point on western Newfoundland, has been the subject of much study. The most recent paper is Miller et al (2014), who presented a detailed conodont zonation across the systemic boundary. The conodont faunas of the Tremadocian and Floian St. George Group, one of the finest carbonate successions of this interval in the world, was monographed by Ji & Barnes (1994), who introduced a detailed zone succession based on taxa of North American Midcontinent affinity.…”

Section: Rhodesognathus Elegansmentioning

confidence: 99%

“…-The Cambrian-Ordovician boundary interval has been investigated in great detail in the Ibex area in western Utah (e.g. Miller et al 2003Miller et al , 2012Miller et al , 2014. Based on very extensive collections, three Cordylodus zones have been identified in the uppermost Cambrian, and three zones, including the basalmost Ordovician Iapetognathus Zone, have been recognized in the lowermost Tremadocian (Fig.…”

Section: Rhodesognathus Elegansmentioning

confidence: 99%

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Conodonts in Ordovician biostratigraphy

Bergström

Ferretti

2017

LET

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The long time interval after Pander's (1856) original conodont study can in terms of Ordovician conodont biostratigraphical research be subdivided into three periods, namely the Pioneer Period (1856-1955), the Transition Period (1955-1971) and the Modern Period (1971-Recent). During the pre-1920s, the few published conodont investigations were restricted to Europe and North America and were not concerned about the potential use of conodonts as guide fossils. Although primarily of taxonomic nature, the pioneer studies by Branson & Mehl, Stauffer and Furnish during the 1930s represent the beginning of the use of conodonts in Ordovician biostratigraphy. However, no formal zones were introduced until Lindström (1955) proposed four conodont zones in the Lower Ordovician of Sweden, which marks the end of the Pioneer Period. Because Lindström's zone classification was not followed by similar work outside Baltoscandia, the time interval up to the late 1960s can be regarded as a Transition Period. A milestone symposium volume, entitled 'Symposium on Conodont Biostratigraphy' and published in 1971, summarized much new information on Ordovician conodont biostratigraphy and is taken as the beginning of the Modern Period of Ordovician conodont biostratigraphy. In this volume, the Baltoscandic Ordovician was subdivided into named conodont zones, whereas the North American Ordovician succession was classified into a series of lettered or numbered faunas. Although most of the latter did not receive zone names until 1984, this classification has been used widely in North America. The Middle and Upper Ordovician Baltoscandic zone classification, which was largely based on evolutionary species changes in lineages and hence includes phylozones, has subsequently undergone only minor changes and has been used slightly modified also in some other regions, such as New Zealand, China and eastern North America. The great importance of conodonts in Ordovician biostratigraphy is shown by the fact that conodonts are used for the definition of two of the seven global stages, and seven of the 20 stage slices, now recognized within this system

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Section: The Modern Periodmentioning

confidence: 99%

Section: Rhodesognathus Elegansmentioning

confidence: 99%

Section: Rhodesognathus Elegansmentioning

confidence: 99%

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Conodonts in Ordovician biostratigraphy

Bergström

Ferretti

2017

LET

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“…() and Miller et al . () discussed differing views on Iapetognathus , and the outcome of the discussion has implications for precisely tracing the Ordovician base globally.…”

Section: Cambrian Biostratigraphymentioning

confidence: 99%

Cambrian trilobite biostratigraphy and its role in developing an integrated history of the Earth system

Babcock

Shanchi

Ahlberg

2017

LET

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One of the principal biostratigraphical tools used in the lower Palaeozoic, and especially the Cambrian System, is trilobites. Historically, both polymerids and agnostoids have commonly been included as ‘trilobite’ groups, although currently the question of whether they comprise a monophyletic group or are polyphyletic is unsettled. Beginning in the late 1800s, the base of the Cambrian System was marked by the lowest occurrence of olenelline trilobites. Discovery of a rich pre‐trilobite metazoan record in the mid‐1900s led to significant modification of that concept, but polymerids and especially agnostoids still rank among the leading biostratigraphical and chronostratigraphical guides through much of the Cambrian. Chronostratigraphical sub‐division of the trilobite‐bearing part of the Cambrian System derives largely from biostratigraphical, ecological and evolutionary concepts about agnostoids and polymerids introduced in the 1940s to 1970s by A.H. Westergård, A.R. Palmer and R.A. Robison. Westergård introduced a zonation for Scandinavia that was largely based on agnostoids. Palmer explained the distribution of Cambrian trilobite faunas in terms of restricted and unrestricted access to open oceans. Together, these ideas coalesced in Robison's recognition of separate zonation schemes for restricted‐shelf polymerids, open‐shelf polymerids and open‐shelf (cosmopolitan) agnostoids. Palmer also introduced the concept of biomeres, which placed sharp limits on biostratigraphical intervals recognizable from trilobites. Global correlation in the upper half of the Cambrian today depends to a large extent on the ranges of agnostoids and some polymerids characteristic of open‐shelf to slope areas, ones that facilitate identification of precise intercontinental tie points. Agnostoid and polymerid biostratigraphy is now being integrated with information about coastal onlap and eustatic sea‐level history, geochemical cycling and other data to provide a more complete understanding of the early Palaeozoic biosphere and its complex physico‐chemical context.

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“…As a result, the identification of the CambrianOrdovician boundary level outside the GSSP section has proven to be problematic. Miller et al (2003Miller et al ( , 2014b suggested the base of Iapetognathus Zone should be the CambrianOrdovician boundary level, i.e., the FAD of lowest species of Iapetognathus. In Hunan, I. jilinensis Nicoll et al, 1999 is the lowest species of Iapetognathus.…”

Section: Proconodontus Tenuiserratusmentioning

confidence: 99%

Middle Cambrian through lowermost Ordovician conodonts from Hunan, South China

Dong

Zhang

2017

J. Paleontol.

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Since 1986, samples with a total mass of more than 14,000 kg, mainly from three key sections in western Hunan, South China, have been processed for conodonts. Previous work mainly focused on biostratigraphy, but the taxonomy has been performed only on the faunas of the middle Cambrian. Described herein are conodonts of the upper Cambrian (Furongian Series) through lowermost Ordovician from Hunan, South China. Conodonts of the middle Cambrian are redescribed, based on material that has been recovered for more than three decades. The fauna consists of 82 species belonging to 36 genera. Newly established genera areLugnathusn. gen.,Miaognathusn. gen.,Millerodontusn. gen.,Tujiagnathusn. gen.,Wangcunellan. gen. andWangcunognathusn. gen. New species areCoelocerodontus hunanensisn. sp.,Furnishina wangcunensisn. sp.,Laiwugnathus hunanensisn. sp.,Laiwugnathus transitansn. sp.,Lugnathus hunanensisn. gen. n. sp.,Miaognathus multicostatusn. gen. n. sp.,Millerodontus intermediusn. gen. n. sp.,Prosagittodontus compressusn. sp.,Tujiagnathus gracilisn. gen. n. sp.,Wangcunella conicusn. gen. n. sp.,Wangcunognathus elegansn. gen. n. sp.,Westergaardodina dimorphan. sp.,Westergaardodina gigantean. sp., andWestergaardodina solan. sp. The taxonomy of some conodont genera is revised. In the light of histological investigation, genera are assigned to euconodonts, paraconodonts, or protoconodonts. The 13 conodont zones previously proposed in the middle Cambrian through lowermost Ordovician remain the same, but taxa within these conodont zones are documented more clearly because of the revised taxonomy proposed herein.

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The conodont Iapetognathus and its value for defining the base of the Ordovician System

Cited by 26 publications

References 5 publications

Conodonts in Ordovician biostratigraphy

Conodonts in Ordovician biostratigraphy

Cambrian trilobite biostratigraphy and its role in developing an integrated history of the Earth system

Middle Cambrian through lowermost Ordovician conodonts from Hunan, South China

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