Biostratigraphy and paleoenvironmental characterization of the Middle Ordovician from the Sierras Subandinas (NW Argentina) based on organic-walled microfossils and sequence stratigraphy

Rubinstein, Claudia V.; Vecoli, Marco; Astini, Ricardo A.

doi:10.1016/j.jsames.2010.07.006

Cited by 26 publications

(17 citation statements)

References 58 publications

(85 reference statements)

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“…According to Yan et al (2005), in South China T. additionalis and Striatotheca transformata are confined to the late Floian C. deflexus and A. suecicus graptolite zones; in other parts of Gondwana, it ranges up to the lower Darriwilian. In north-western Argentina, T. additionalis occurs in the lower part of the Darriwilian Capillas Formation (Rubinstein et al 2011). By contrast, Polygonium gracile, which has the second frequency in the sample, is a long-ranging taxon known from the Furongian to the Middle Ordovician (Brocke 1998, Cramer & Díez 1977, Vecoli & Le Hérissé 2004.…”

Section: Acritarchsmentioning

confidence: 99%

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

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The Lower-Middle Ordovician sediments exposed in the Faraghan Mountains, south-eastern Zagros Ranges, represent a condensed succession of siliciclastic-dominated rocks rich in palynomorph assemblages (acritarchs and subsidiary chitinozoans) and sparse shelly concentrations bearing biostratigraphically significant brachiopods and conodonts. The Lower Ordovician Zard-Kuh Formation comprises coarse-grained siliciclastic deposits rich in Cruziana ichnofossils. The lower 80 m of the overlying Seyahou Formation, late Floian to Katian in age, form a heterolithic succession composed of black and green shales, subarkoses and silty limestones. Its lower part is punctuated by a centimetric phosphoarenite that contains lingulate brachiopods (Atansoria yaseri sp. nov.) and conodonts (Baltoniodus aff. B. triangularis Lindström and Drepanoistodus sp.) that suggest a latest Floian age. The top of the condensed phosphoarenite is marked by a considerable hiatus that ranges the Dapingian and early Darriwilian interval. Overlying the hiatus, the Seyahou Formation comprises two fossiliferous levels, the oldest dated as mid-Darriwilian with chitinozoans characteristic of the Siphonochitina formosa Zone, and the youngest of the Katian Acanthochitina barbata Zone. Mid Ordovician phosphogenesis associated with starvation, reworking, resedimentation, and the onset of distinct stratigraphic gaps was a complex process recorded throughout the Arabian margin of Gondwana. In the Zagros Ranges, maximum flooding and phosphate precipitation are suggested as the counterpart of the Helskjer Drowning Event of Baltoscandia and the third-order maximum flooding surface that punctuates the Siphonochitina formosa Zone in North Africa.•

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Section: Acritarchsmentioning

confidence: 99%

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

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“…Frequent subaerial exposures and largely marginal marine settings explain the scarcity of invertebrates throughout the section (Rubinstein et al . ).…”

Section: Geological Setting and Stratigraphymentioning

confidence: 97%

“…The lower of these, the Laja Morada Member, records extensive subaerial exposure, with water table fluctuations in the interfluves, which occurred during a lowering of the relative sea level, indicated by subaerial features and a gradual change toward purple–red colours near the top (Rubinstein ; Rubinstein et al . ). The low fossil content of the upper Zanjón and Labrado formations could be a consequence of early oxidation of these stratigraphic units (Rubinstein et al .…”

Section: Geological Setting and Stratigraphymentioning

confidence: 97%

“…The low fossil content of the upper Zanjón and Labrado formations could be a consequence of early oxidation of these stratigraphic units (Rubinstein et al . ). Organic‐walled phytoplankton (acritarchs and chlorophyte algae) and chitinozoans are the only biostratigraphically significant fossils of the upper part of the Zanjón Formation and its transition to the Labrado Formation (Rubinstein ; Rubinstein et al .…”

Section: Geological Setting and Stratigraphymentioning

confidence: 97%

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Early Middle Ordovician scolecodonts from north‐western Argentina and the emergence of labidognath polychaete jaw apparatuses

et al. 2017

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Scolecodonts provide fossil evidence of the evolution and diversification of jaw‐bearing polychaetes from the latest Cambrian onwards. However, their record before the Darriwilian (Middle Ordovician) is scarce worldwide, which limits our understanding of key evolutionary events. One such event is the emergence of taxa possessing the asymmetrical labidognath‐type jaw apparatus architecture, which became common in the Middle Ordovician and is often dominant throughout the Palaeozoic. Here, we document a small collection of Dapingian scolecodonts from the Capillas section, Sierras Subandinas, north‐western Argentina. The isolated elements recovered allowed us to reconstruct the distinctive jaw apparatus, and to introduce a new taxon, Andiprion paxtonae gen. et sp. nov. The maxillary apparatus of Andiprion is intermediate between the symmetrognath type of the Early Ordovician Kadriorgaspis and the labidognath type that is present in polychaetaspids and related taxa. The apparatus architecture of Andiprion corresponds best to the labidognath type, but the morphology of the individual jaws suggests that it may be the most primitive representative of this lineage currently known. We propose that Andiprion‐like forms were ancestral to polychaetaspids, polychaeturids and ramphoprionids. The Capillas collection provides supporting evidence for the evolutionary homology of the ‘basal plate’ and the left first maxilla. Thus the labidognath‐type asymmetry, with an unpaired left maxilla III, developed as a result of gradual reduction in size of the first right jaw (‘basal plate’) in front of the carriers, instead of loss or fusion of anterior maxillae.

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“…However, de la Puente & Rubinstein (2013, fig. 3) placed the FAD of Liliosphaeridium intermedium at the base of the Darriwilian Stage (base of Stage Slice Dw1 and Time-Slice 4a) in the Central Andean Basin, and Rubinstein et al (2011) placed the FAD of the same species at about the same level in the Capillas Formation of the Sierras Subandinas. Hence, the FAD of Liliosphaeridium in East Gondwana is placed tentatively at the base of Stage Slice Fl2 and more definitely at the base of Stage Slice Dw1 (Fig.…”

Section: Note On Palaeogeographical Classificationmentioning

confidence: 99%

First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician

Servais

Molyneux

et al. 2018

LET

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First Appearance Datums (FADs) of selected, easily recognizable acritarch morphotypes are assessed to determine their potential contribution to correlation between Lower and Middle Ordovician stages and substage divisions along the Gondwanan margin (Perigondwana) and between Perigondwana and other palaeocontinents. The FADs for 19 genera, species and species groups are recorded throughout their biogeographical ranges. The taxa investigated fall into three groups. Some have FADs at about the same level throughout their biogeographical ranges and are useful for long‐distance and intercontinental correlation. Among these are Coryphidium, Dactylofusa velifera, Peteinosphaeridium and Rhopaliophora in the upper Tremadocian Stage; Arbusculidium filamentosum, Aureotesta clathrata simplex and Coryphidium bohemicum in the lower–middle Floian Stage; Dicrodiacrodium in the upper Floian Stage; Frankea in the Dapingian–lower Darriwilian stages; and Orthosphaeridium spp., with FADs in the Dapingian–lower Darriwilian stages of Perigondwanan regions and at about the same level in Baltica. Other taxa, however, have diachronous (or apparently diachronous) FADs, and this needs to be taken into account when using them for correlation. A second group of genera and species, comprising Striatotheca, the Veryhachium lairdii group and the V. trispinosum group, have a recurring pattern of FADs in the Tremadocian Stage on Avalonia and in South Gondwana and West Gondwana, but in the Floian Stage of South China and East Gondwana. The third group, consisting of Arkonia, Ampullula, Barakella, Dasydorus, Liliosphaeridium and Sacculidium, have FADs that are markedly diachronous throughout their biogeographical ranges, although the global FADs of Arkonia, Ampullula, Liliosphaeridium and Sacculidium are apparently in South China and/or East Gondwana. It is possible that diachronous FADs are only apparent and an artefact of sampling. Nevertheless, an alternative interpretation, suggested by recurring patterns, is that some as yet undetermined factor controlled a slower biogeographical spread over time, resulting in diachroneity.

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Biostratigraphy and paleoenvironmental characterization of the Middle Ordovician from the Sierras Subandinas (NW Argentina) based on organic-walled microfossils and sequence stratigraphy

Cited by 26 publications

References 58 publications

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Early Middle Ordovician scolecodonts from north‐western Argentina and the emergence of labidognath polychaete jaw apparatuses

First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician

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