Palaeoecology of Chondrodonta (Bivalvia) from the lower Aptian (Cretaceous) Apulia Carbonate Platform (Gargano Promontory, southern Italy)

Posenato, Renato; Morsilli, Michele; Guerzoni, Stefania; Bassi, Davide

doi:10.1016/j.palaeo.2018.08.002

Cited by 12 publications

(25 citation statements)

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“…12D) and Mathesia darderi (Fig. 12B) is also in accordance with an upper lower Aptian (Bedoulian) age (e.g., Arnaud et al, 1998;Bernaus et al, 2003;Skelton, 2003;Bover-Arnal et al, 2010, 2015, 2016Skelton et al, 2010;Schlagintweit and Bover-Arnal, 2012;Skelton and Gili, 2012;Schlagintweit et al, 2010Schlagintweit et al, , 2013Schlagintweit et al, , 2016Granier et al, 2013;Gili et al, 2016;Steuber et al, 2016;Posenato et al, 2018). In addition, the observed Polyconites rudists exhibit a relatively thick aragonite wall (Fig.…”

Section: Age Of the Successionsupporting

confidence: 78%

Geology of the ‘Sénia stone’ from Ulldecona, Catalonia (Aptian, Maestrat Basin, Iberian Chain) and its implications for regional stratigraphy

Bover‐Arnal

Salas

2019

Cretaceous Research

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The municipality of the town of Ulldecona (Catalonia) is notable for extensive quarrying activities, which exploit limestone, popularly named Stone from Ulldecona, for ornamental and building purposes. The Stone from Ulldecona, commercially known as Sénia stone, is one of the most important ornamental and building stones quarried in Catalonia, and is used worldwide in all kinds of public and private buildings. Little is known about the geological nature of this stratigraphic interval of commercial value. Therefore, this study explores the geology of the Stone from Ulldecona in open pit quarries and natural outcrops. The Stone from Ulldecona consists of limestones of upper lower Aptian age, including wackestone, packstone and grainstone textures containing peloids, miliolids, Palorbitolina lenticularis, Orbitolinopsis simplex, Paracoskinolina maynci, Lithocodium aggregatum, Choffatella decipiens, Salpingoporella muehlbergi, Chondrodonta, Toucasia carinata, Polyconites sp. and Mathesia darderi. These platform carbonates rich in orbitolinids and rudists belong to the Villarroya de los Pinares Formation of the Maestrat Basin. Locally, the limestones are highly bioturbated and/or dolomitized. Dolomitic limestones, calcitic dolostones and dolostones are stratabound tabular geobodies with thicknesses of up to 60 metres. Dolomitic limestones and calcitic dolostones corresponding to initial and intermediate stages of dolomitization mainly exhibit isolated euhedral dolomite crystals or idiotopic mosaics. Dolostones (advanced dolomitization stages) are sucrose, exhibit vacuolar and cave porosities, and are characterized by idiotopic and hypidiotopic mosaics, which indicate temperatures lower than 50-60ºC during dolomitization. Dolomite textures are mainly fabric-destructive and pervasive, but locally retentive and/or selective fabrics also occur. The limestones of the Villarroya de los Pinares Formation, the underlying marls of the Forcall Formation and the overlying marls and platform carbonates of the Benassal Formation examined can be arranged into two high-rank, low-frequency transgressive-regressive sequences. Similar coeval long-term transgressive-regressive trends have been reported from other 2 basins, indicating that eustatism largely controlled accommodation of the Aptian succession studied in Ulldecona.

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Section: Age Of the Successionsupporting

confidence: 78%

Geology of the ‘Sénia stone’ from Ulldecona, Catalonia (Aptian, Maestrat Basin, Iberian Chain) and its implications for regional stratigraphy

Bover‐Arnal

Salas

2019

Cretaceous Research

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“…14d), which show repeated cycles of accumulation of horizontally oriented shells followed by vertically organized shells, embedded in wackestones ( Figs. 16a and 16b), with a similar growth fabric to those described by Posenato et al (2018) from the lower Aptian of the Gargano Peninsula in SE Italy. This type of facies is best developed and shows larger specimens in the Clansayesian and lowermost Albian levels, and has also been described in sections from the upper Aptian of the Basque-Cantabrian basin (Gómez-Pérez et al, 1999;Millán et al, 2014).…”

Section: Late Aptian To Early Albian Seguilí Platformsupporting

confidence: 70%

Aptian carbonate platform development in the Southern Iberian Palaeomargin (Prebetic of Alicante, SE Spain)

Skelton

Jiménez

Ruiz-Ortiz

2019

BSGF - Earth Sci. Bull.

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The Aptian stratigraphic record of the Alicante region consists of: a rudist and coral-rich carbonate platform of earliest Aptian age (Llopis Formation), with a discontinuous siliciclastic member at its top; followed by late Early, to Late Aptian hemipelagic marls and marlstones (Almadich Formation); and then by renewed carbonate platform development of Late Aptian to earliest Albian age (Seguilí Formation). In the Llopis Formation, SW-dipping, massive clinoform beds of bioclastic debris are succeeded by flat-lying platform-top beds. The latter show a cyclically regressive stacking of biofacies, with rudist-dominated floatstone in their lower parts passing upwards to finer-grained, more sparsely fossiliferous bed tops with burrow mottling. Caprinid rudists, with originally almost wholly aragonitic shells, dominate the external platform-top facies, while more internal facies contain a mix of monopleurid, polyconitid and requieniid rudists, all with relatively slightly thicker development of the calcitic outer shell layer, together with caprinids. Biostratigraphic and carbon-isotope data link the termination of the Llopis platform with the onset of OAE1a. The carbonate platform of the Seguilí Formation again contains tabular platform-top beds showing repeated cyclic regression, with dense rudist and/or chondrodont floatstones overlain by sparser floatstones with wackestone matrix and secondarily filled burrows. But caprinids are now absent, while requieniids and polyconitids, some of large size, as well as radiolitids, all with thickened calcitic outer shell layers, accompany the tubular monopleurid, Mathesia, together with a greater development of Chondrodonta biofacies. The same overall pattern of biotic turnover from the Early, to the Late Aptian is confirmed in other parts of Iberia and contiguous regions. Moreover, Iberian platforms of late Early Aptian age outside the present study area reveal a transitional phase with an increasing proportion of polyconitids in the outer platform-top to upper slope facies at the expense of caprinids. The siliciclastic influx at the top of the Llopis Formation implies a climatic shift from arid, to relatively more humid/pluvial conditions through the mid-Early Aptian, as seen in several other Iberian sections. This climatic change was probably forced by the intensified greenhouse conditions at the onset of OAE1a. By contrast with these Iberian platforms, caprinids continued to dominate the outer platform-top zones of some central to southern Tethyan platforms until the close of the Early Aptian. This broad palaeolatitudinal differentiation of rudist associations within the Tethyan belt implies a climatic influence, whether exerted through thermal modulation of seawater pH and/or aragonite saturation, variation in nutrient flux, or any combination of these. Keywords: Aptian / carbonate platforms / Prebetic Zone / palaeoecology / rudist coral formations / OAE1aRésumé -Développement des plates-formes carbonatées dans l'Aptien de la marge continentale sud-Ibérique (Prébétique d'A...

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“…In the most recent classifications of the Bivalvia Carter et al (2011) placed Chondrodontidae within the superfamily Plicatuloidea (Order Pectinida). This classification has been supported by recent observations on the shell composition and microstructures (Posenato et al, 2018). The affinities with the living Plicatula are (1) the cementation on the right valve, (2) the occurrence of an inner aragonitic layer, replaced in the fossil shells by sparry calcite cement, and ( 3) an outer layer of simple and irregular complex crossed foliated calcite.…”

Section: Classificationsupporting

confidence: 65%

“…This can be related to the bad preservation of the beak in the observed specimens and the reduced extension of the scar surface. A cemented behaviour of Chondrodonta during the juvenile stage is suggested by Dhondt and Dieni (1993) and Posenato et al (2018), and also observed in some bouquets from the Cape Savudrija succession (Fig. 6.14).…”

Section: External Characterssupporting

confidence: 63%

“…During the early evolutionary phase, in the early Aptian, Chondrodonta was of characteristically small sized and with prevailing smooth shells with a short hinge plate. These characters distinguished C. glabra Stanton, which in the Gargano Promontory (southern Italy) created meter-thick accumulations located stratigraphically below the onset of the OAE 1a (Graziano, 2013;Graziano et al, 2013;Guerzoni, 2016;Posenato et al, 2018). This species developed a mud-sticker bottom stabili ation and produced moderately elongated, sticklike shells (Posenato et al, 2018).…”

Section: Introductionmentioning

confidence: 97%

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Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)

Posenato

Frijia

Morsilli

et al. 2020

Palaeogeography, Palaeoclimatology, Palaeoecology

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Chondrodonta joannae (Choffat) is a morphologically variable oyster-like bivalve with a predominately calcitic shell. An exceptional exposure of C. joannae-bearing strata of late Cenomanian age crops out along the seaside in northern Istria (Croatia) and permits a taphonomical and functional analysis in order to define the life habit and growth strategies of this bivalve. The C. joannae population from the studied succession is characterised by highly-elongated, large and curved shells, reaching about 50 cm in height and 5 cm in length. This shell shape is typical of the club-like bivalve morphotype, which was adapted to soft-bottom substrates with high sediment accumulation. The shell is slightly inequivalve and characterized by a reduced body cavity, a few centimetres high, and a dorsal region up to 10 times longer. The shell opening mechanism was mostly based on the resilium located between the chondrophores which protrude in the body cavity.The abandoned dorsal cavity is filled by a calcite hinge plate, the ventral edge of which acted as fulcrum for the valve flexibility. In the hinge plate, the function of chondrophores changed. They acted as a hinge to keep tightly interlocked the valves, which considerably emerged above the sediment-water interface. The individuals were arranged in low shrub-type congregations, which produced low-relief mounds. The functional morphology and taphonomic signature suggest that C. joannae individuals collected food at a greater distance from the bottom with respect to the cooccurring rudists. We speculate that the C. joannae proliferation could be related to a late Cenomanian phase of environmental instability predating the OAE2 with fluctuating climatic conditions and ocean fertility.

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Palaeoecology of Chondrodonta (Bivalvia) from the lower Aptian (Cretaceous) Apulia Carbonate Platform (Gargano Promontory, southern Italy)

Cited by 12 publications

References 53 publications

Geology of the ‘Sénia stone’ from Ulldecona, Catalonia (Aptian, Maestrat Basin, Iberian Chain) and its implications for regional stratigraphy

Geology of the ‘Sénia stone’ from Ulldecona, Catalonia (Aptian, Maestrat Basin, Iberian Chain) and its implications for regional stratigraphy

Aptian carbonate platform development in the Southern Iberian Palaeomargin (Prebetic of Alicante, SE Spain)

Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)

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