The nautiloid genus Cymatoceras from the Cretaceous of the Neuquén and Austral basins, Argentina

Cichowolski, Marcela

doi:10.1016/s0195-6671(03)00050-8

Cited by 25 publications

(20 citation statements)

References 11 publications

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“…This guild is represented by Cymatoceras perstriatum (Steuer), the only nautiloid recorded in the Agrio Formation (Cichowolski 2003). It is interpreted here that these animals were slow swimmers that lived associated with the bottom, on which they fed mainly scavenging and where egg-lying occurred.…”

Section: Nekto-benthicmentioning

confidence: 79%

Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina

Lazo

Cichowolski

Rodríguez

et al. 2005

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The lithofacies and macrofossil guilds of the Agrio Formation (Upper Valanginian-Lower Barremian) have been analysed using evidence from sedimentological, taphonomic and palaeoecological studies. The study area is Agua de la Mula and adjacent regions in central Neuqu6n. Seven lithofacies have been recognized in the field, which indicate that the Agrio Formation was deposited in an open-marine, ramp depositional system under storm influence. Lithofacies indicate conditions that range from low-energy basin to high-energy inner ramp. Outer and mid-ramp deposits are the most abundant. Macrofossils have been grouped into 16 guilds based on tiering, life habit and feeding category. The guilds indicate normal benthic oxygen level, normal salinity, and soft-firm muddy and sandy bottoms. Suspension-feeders are more common than deposit-feeders suggesting the predominance of suspended food particles over deposited food resources. A low input of siliciclastics and, possibly, other palaeoceanographic conditions allowed the development of oolitic facies in the inner ramp and coral patch reefs in the upper mid-ramp for a limited period of time.

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Section: Nekto-benthicmentioning

confidence: 79%

Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina

Lazo

Cichowolski

Rodríguez

et al. 2005

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“…Despite these efforts, classification at the familiar and generic levels is still under debate, especially with respect to the family Cymatoceratidae Spath, 1927(see discussion in Wilmsen 2000Wilmsen and Yazykova 2003;Wilmsen and Esser 2004;Frank 2010;and Frank et al 2013). Herein, we follow Shimansky (1975), placing most of the 'cymatoceratid' genera within the family Nautilidae Blainville, 1825 (e.g., Wilmsen 2000;Cichowolski 2003;Frank et al 2013). Because the present paper is only a short communication, synonymies are kept to a minimum (first reference, regional records, important revisions).…”

Section: Systematic Palaeontologymentioning

confidence: 96%

Taxonomy and taphonomy of Cenomanian (Upper Cretaceous) nautilids from Annopol, Poland

Machalski

Wilmsen

2015

Acta Geologica Polonica

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A nautilid faunule of seven specimens, comprising Eutrephoceras bouchardianum (d’Orbigny, 1840), Cymatoceras deslongchampsianum (d’Orbigny, 1840), and Cymatoceras tourtiae (Schlüter, 1876) is described from a condensed middle Cenomanian interval at Annopol, Poland. C. tourtiae is recorded for the first time in Poland. The studied material consists of reworked phosphatised internal moulds of phragmocones, which may be of early or middle Cenomanian age, given the stratigraphic range of the associated ammonites. The nautilid moulds vary in inferred mode of infilling, and in intensity of abrasion, bioerosion and mineralisation. The sediment entered the phragmocones in two ways: 1) through punctures in the shell, the result of bioerosion or mechanical damage; 2) through siphonal openings by intracameral currents. In contrast to the fossil moulds from the Albian phosphorites of Annopol, which originated via direct precipitation of apatite around and/or inside fossils, the present nautilid moulds seem to have originated through secondary phosphatisation of the initially calcareous moulds. Diversity of taphonomic signatures in nautilid material from the middle Cenomanian interval at Annopol is compatible with the complex, multievent depositional scenario proposed for this level.

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“…sp. (Figure 6.1) was found in the Nanogyra virgula banks of the El Papaote diapir; the genus has been reported from Upper Jurassic and Lower Cretaceous strata (Cichowolski, 2003). Other mollusks found at El Papalote diapir, associated with oyster banks are an indeterminate gastropod, Eocallista?…”

Section: Paleontologymentioning

confidence: 95%

Upper Jurassic (Lower Kimmeridgian-Olvido) carbonate strata from the La Popa Basin diapirs, NE Mexico

Vega¹,

Lawton²

2011

BSGM

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Carbonate strata that occur as blocks encased in gypsum of three different salt diapirs in La Popa Basin contain a single invertebrate fauna indicating a Late Jurassic (Kimmeridgian) age for all sampled fossiliferous blocks. The most biostratigraphically significant species, present in all diapirs, is the gryphaeid oyster Nanogyra virgula. Other species identified in the blocks include the bivalves Astarte gracilicostula, Cercomya durangensis, Myophorella sp., Grammatodon sp. and the nautiloid Cymatoceras? sp. Geologic relations of the entire assemblage of carbonate blocks, including nodular gypsum interbedded with the fossiliferous beds, salt casts in micrite of the blocks, random structural position of blocks within the diapiric evaporite, absence of blocks younger than Early Kimmeridgian in the diapirs, and regional stratigraphic relations, suggest that the carbonate strata were originally interbedded with, or directly overlie, evaporite strata. This inference is corroborated by the presence of Nanogyra virgula (previously reported as Exogyra cf. E. susplicifera) in carbonate strata directly overlying massive gypsum at Potrero Minas Viejas, adjacent to La Popa Basin. Although previously correlated with the Zuloaga Limestone, the fauna in the carbonate blocks of the diapir instead indicate a correlation with carbonate and evaporite strata of the Olvido Formation, and by extension, with siliciclastic strata of La Caja and La Casita formations. The new biostratigraphic data thus indicate that evaporite deposition persisted into the Kimmeridgian and, because the fossiliferous beds are inferred to have overlain a very thick section of halite (>2 km), it is suggested that evaporite deposition was continuous with only brief interludes of carbonate deposition from Callovian to early Kimmeridgian time in La Popa Basin.

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The nautiloid genus Cymatoceras from the Cretaceous of the Neuquén and Austral basins, Argentina

Cited by 25 publications

References 11 publications

Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina

Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina

Taxonomy and taphonomy of Cenomanian (Upper Cretaceous) nautilids from Annopol, Poland

Upper Jurassic (Lower Kimmeridgian-Olvido) carbonate strata from the La Popa Basin diapirs, NE Mexico

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