Paleoecology of Late Cretaceous Rudist Settlements in Central Oman

Schumann, Dietrich

doi:10.2110/pec.00.69.0143

Cited by 9 publications

(4 citation statements)

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“…Large wide-cylindrical forms, however, tended to live solitarily or as minor components in congregations of elongate-cylindrical hippuritids. A notable exception has been described by Schumann [22] in Central Oman. In this area, the large shells of Vaccinites vesiculosus (Woodward) form monospecific congregations of large number of individuals, extending over areas up to 100 km', The aggregative habit of hippuritids was expressed in different degrees: from two/three individuals attached together, making a small bouquet, to hundreds of clustered individuals building up large congregations [16,23,17,24,25,26,7,18,27,28 among others] (Plate 11, fig.…”

Section: Hippuritid Shell Form and Growth Habitmentioning

confidence: 97%

Use of Hippuritids for Interpreting Carbonate Platform Environments

Gili

2003

North African Cretaceous Carbonate Platform Systems

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Hippuritid rudists have a highly inequivalve shell, with the conical to cylindrical attached valve capped by an operculiform free valve. Variations in oxygen and isotopic composition of hippuritid shells indicate that they recorded valuable information about their life histories, growth patterns and changes in ambient water temperatures. The elaborated system of pores and canals in the free valve for access to feeding currents allowed them to occupy environments with siliciclastic as well as carbonate sedimentation.Hippuritids were sediment-dwellers that grew with their shells partially embedded in, and supported by the surrounding sediment, which implies that they occupied calm to moderate energy environments with interrupted to continuous sedimentation. This mode of growth permitted hippuritids continued upward growth of the entire commissure. In case of toppling, hippuritids had the faculty of resuming their upward growth by geniculated growth . The morphological characters and life habits of hippuritids have shown to be a useful tool for interpreting their depositional environment.

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Section: Hippuritid Shell Form and Growth Habitmentioning

confidence: 97%

Use of Hippuritids for Interpreting Carbonate Platform Environments

Gili

2003

North African Cretaceous Carbonate Platform Systems

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“…Several explanations for the low diversity due to restricted conditions in similar settings have been proposed in rudist literature: Schumann (2000) points to high salinity due to diurnal heating and, as a consequence, low oxygenation of seawater; and Steuber (2000) discusses anoxic conditions of the bottom surface due to accumulation of rudist biodeposits. We have no relevant data to contribute to these explanations but we can state that (1) storm layers are frequent in all recognized succession types, (2) no signiWcant organic matter appears in the matrix of any of the described rudist reefs, and (3) there are no sulphates in the surrounding areas.…”

Section: Palaeoecological Implicationsmentioning

confidence: 98%

“…There are numerous examples of rudistid lithosomes available in the literature that have been related both to TSTs and to HSTs, as those from Oman (Schumann 2000), Croatia (Moro 1997), Mexico (Schafhauser et al 2007) or those from the Pyrenees or the Alps Pons 1999, 2001). However, in the Castrojimeno Section, rudist-bearing lithosomes are only located at the fourth-order HSTs of DS-2.5 and DS-2.6, and no rudist faunas have been found at the TSTs (see Fig.…”

Section: Eustatic Control Of the Faunal Distributionmentioning

confidence: 99%

Succession of rudistid lithosomes along the western coastal margin of the Iberian Basin (Coniacian, Castrojimeno Section, central Spain)

Gil

Pons

Segura

2009

Facies

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Rudistid lithosomes cropping out near Castrojimeno, at the northern margin of the Central System in north-central Spain, provide detailed information on their composition and structure, on their development and succession, and about their relationship with the Coniacian sequence stratigraphy framework of the Iberian Basin. Most rudist assemblages are oligospeciWc, with a dominant species, or monospeciWc. The radiolitids Biradiolites angulosus, Praeradiolites requieni, and Radiolites sauvagesi and the hippuritids Hippurites incisus and Vaccinites giganteus were identiWed. Radiolitids demonstrate wide intraspeciWc morphological variability. The following Riding's structural categories of organic reefs are represented: segment reefs, spaced and close cluster reefs, and close cluster/frame reefs. Bioclastic beds of reworked rudist fragments occur below or in between the rudist reefs. The vertical succession of all Wve types of rudistid lithosomes distinguished evidences a shallowing-upward trend. Rudistid lithosomes developed on the coastal margin during the superposition of the highstand sea-level stage of third-and fourth-order depositional sequences.

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“…Colonies of rudistids (cluster reefs) are present in very shallow lagoonal environments (Riding, 2002;Sadooni, 2018). The good preservation of rudistid shells in rudistid buildups shows growth and colonization in the low energy environment, rapid burial (high rate of sedimentation), and the absence of transportation currents (Schumann, 2000;Ruberti et al, 2006Ruberti et al, , 2007Sadooni, 2018). Based on the matters stated above, the rudistid cluster reefs (microfacies MF 6) were deposited in a low energy open lagoonal environment with high rates of sedimentation and the absence of strong currents.…”

Section: Inner Rampmentioning

confidence: 99%

Biostratigraphy and Sequence Stratigraphy of the Tarbur Formation (Maastrichtian) from Iranian Zagros Foreland Basin, Southwest of Iran

Ghanbarloo

Safari

Vaziri‐Moghaddam

2022

Acta Geologica Sinica (Eng)

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Shallow carbonate deposits (Tarbur Formation) were formed in the Zagros foreland basin with dynamic tectonics during the Maastrichtian age. From the viewpoint of reconstruction of depositional conditions in these deposits, studies of biostratigraphy, microfacies, microtaphofacies, and sequence stratigraphy were performed in a single area at Tang-e Shabi Khoon, northwest of Zagros. Based on the identification of two assemblage zones consisting of benthic foraminifera in these strata, the formation was deposited during the middle to late Maastrichtian. The number of cycles in test size and type of coiling in Loftusia decreased from the study area toward the northwest of the Neotethys basin. The input of clastic sediments affected the distribution of Loftusia and rudists in the study area. Nine microfacies, six microtaphofacies, and one terrigenous facies (shale) were identified based on the sedimentary features. These deposits of the middle-late Maastrichtian were deposited on a homoclinal carbonate ramp. The platform can be divided into restricted and semi-restricted lagoon, shoal, and open marine environments. In the study area, the deposits of the Tarbur Formation were deposited during four third-order depositional sequences. Local fault activities affected the formation of depositional sequences in the study area.

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Paleoecology of Late Cretaceous Rudist Settlements in Central Oman

Cited by 9 publications

References 0 publications

Use of Hippuritids for Interpreting Carbonate Platform Environments

Use of Hippuritids for Interpreting Carbonate Platform Environments

Succession of rudistid lithosomes along the western coastal margin of the Iberian Basin (Coniacian, Castrojimeno Section, central Spain)

Biostratigraphy and Sequence Stratigraphy of the Tarbur Formation (Maastrichtian) from Iranian Zagros Foreland Basin, Southwest of Iran

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