Liostrea roemeri (Ostreida, Bivalvia) attached to Upper Jurassic ammonites of northeastern Mexico

Zell, Patrick; Beckmann, Seija; Stinnesbeck, Wolfgang

doi:10.1007/s12549-014-0154-z

Cited by 13 publications

(12 citation statements)

References 35 publications

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“…The correct option may be selected based on epizoan distribution and orientation (Seilacher , ; Schmid‐Röhl & Röhl ; Zell et al . ). Such data are missing for the present material.…”

Section: Development Of Pseudo‐steinkernsmentioning

confidence: 97%

“…Naturally, epizoic oysters could colonize not only dead shells lying on the seafloor, but also post-mortem ammonite floats or even the shells of live hosts. The correct option may be selected based on epizoan distribution and orientation (Seilacher 1960(Seilacher , 1982Schmid-R€ ohl & R€ ohl 2003;Zell et al 2014). Such data are missing for the present material.…”

Section: Stage B: Colonization Of Empty Ammonite Shells By Oysters Anmentioning

confidence: 99%

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A new mode of ammonite preservation – implications for dating of condensed phosphorite deposits

Machalski

Olszewska-Nejbert

2016

LET

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Unusual phosphatic casts of the ammonites Mortoniceras (Subschloenbachia) sp. and Stoliczkaia sp. from the upper Albian condensed phosphorite bed at Annopol, Poland, are discussed in terms of their taphonomic history. These specimens are interpreted as ‘secondary’ external casts of ammonite replicas preserved originally as attachment scars on oyster shells. The following genetic history is suggested for this previously undocumented mode of ammonite preservation: (1) settling of shells of dead ammonites on the seafloor; (2) colonization of these shells by oysters and formation of ammonite replicas on left valves of oysters; (3) dissolution of ammonite shells; (4) reworking and fragmentation of oyster shells; (5) casting of ammonite replicas by phosphatic material; and (6) separation of ammonite casts from oyster shells, either through mechanical disintegration or dissolution of the latter. The specimens studied were formed after dissolution of the ammonite conchs, not prior to this event as in the case of typical ammonite steinkerns (internal moulds). Therefore, they are here referred to as ‘pseudo‐steinkerns’. The time interval between loss of the original ammonite shells and the formation of oyster‐mediated pseudo‐steinkerns may be very extensive. Therefore, the pseudo‐steinkerns may potentially mislead in biostratigraphic dating of condensed phosphorite deposits.

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“…The correct option may be selected based on epizoan distribution and orientation (Seilacher , ; Schmid‐Röhl & Röhl ; Zell et al . ). Such data are missing for the present material.…”

Section: Development Of Pseudo‐steinkernsmentioning

confidence: 97%

Section: Stage B: Colonization Of Empty Ammonite Shells By Oysters Anmentioning

confidence: 99%

A new mode of ammonite preservation – implications for dating of condensed phosphorite deposits

Machalski

Olszewska-Nejbert

2016

LET

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“…One more example of biostatistics analysis is presented in [51]. The authors measured the orientations of oyster attachments on ammonite shells, concluding that the oysters attached themselves while the ammonites were living (Figure 4.5).…”

Section: A B Cmentioning

confidence: 99%

Recent Advances in Geomathematics: Croatian Examples from Subsurface Geological Mapping and Biostatistics

Malvić¹,

Bošnjak²,

Velić³

et al. 2020

Preprint

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Geomathematics is extremely important in geosciences, particularly in the geology. The key for any geomathematical analysis is the definition of a typical model to be applied for further prognosis, either through deterministical or stochastical approaches. The selection of the appropriate procedure is presented in this paper. Two different geomathematical subfield datasets were used in subsurface geological mapping and palaeontology and different biostatistics applications, representing important geomathematical subfields in the Croatian geology. The different subsurface interpolation methods, tested, validated and recommended for application, were used to obtain the best possible outcome in reservoir modelling, in the cases with small datasets. Cross-validation may be selected as the main selection criteria, applied to the Croatian part of the Pannonian Basin System (abbr. CPBS). Recent advances in biostatistics applied in palaeontology and case studies from Croatia are also presented, where biometric studies are of significant importance in fossil biota. Data, methods and problems in geosciences is a vast subject, and address a wide spectrum of fundamental science. Because geology includes subsurface and surface geology, and very different datasets regarding variable and number of data, here are chosen two representative case study groups with original samples from Northern Croatia. Subsurface mapping has been presented on limited petrophysical datasets from the Northern Croatian, Miocene, hydrocarbon reservoirs. Biostatistics has been presented on very different samples, allowing to achieve paleoenvironmental reconstructions of size of relevant fossils, as dinosaurs or other species and their paleoenvironments. All examples highlight examples of the valuable application of geomathematical tools in geology. The results, cautiously validated and correlated with other, non-numerical (indicator, categorical) geological knowledge, are of enormous assistance in creating better geological models.

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“…Cephalopod encrusters with preservable skeletal remains are informative about the life habits, habitats and ecology of hosts and encrusters (Seilacher 1960;Baird et al 1989;Keupp et al 1999;Lukeneder 2008;Zell et al 2014;Hautmann 2017). They may also represent post-mortem colonization of cephalopod shells during their floating phase or when exposed on the seafloor after their death (Seilacher 1968;Donovan 1989;Rakús & Žítt 1993;Klug & Korn 2001;Landman et al 2010;Wyse Jackson & Key 2014;Luci & Cichowolski 2014;Mironenko 2015;Yacobucci 2018).…”

Section: Introductionmentioning

confidence: 99%

Deep‐water cirripedes colonizing dead shells of the cephalopod Nautilus macromphalus from New Caledonian waters

Buckeridge

Kočí

Schlögl

et al. 2019

Integrative Zoology

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Fossil cephalopods are frequently encrusted by epibionts; however, determining whether encrustation occurred prior to or post‐mortem to the host, and whether the final environment of deposition corresponds to the habitat of encrustation is complex. The present paper describes cirripede epibionts, their calcareous bases and their attachment scars on 6 post‐mortem shells of Nautilus macromphalus, collected from deep water off New Caledonia. The cirripedes have left both cemented calcareous bases of Hexelasma and scars associated with bioerosion and discoloration produced by verrucomorph barnacles. Live cirripedes included a Metaverruca recta, with articulated opercular plates and organic tissue (on a shell that had been exposed on the sea floor for at least 150 years), and specimens of Hexelasma velutinum, one of which was partly attached to an internal surface of a shell. The disposition of verrucomorphs indicates that most Nautilus shells were colonized post‐mortem rather than during a floating stage. However, as cirripedes are known to have colonized living Nautilus, some Hexelasma, preserved only as calcareous eroded bases, may represent specimens that settled on a living Nautilus. The degree of bioerosion and discoloration induced by verrucomorph barnacles varies according to the surface preservation of Nautilus shells, with deeper and discolored traces preserved on old and degraded shells. Traces made by verrucomorphs described here are ellipsoidal and a new ichnotaxon, Anellusichnus ellipticus, is proposed to accommodate them. Importantly, verrucomorphs and other cirripede taxa with membranous bases that were attached to pristine shells may not leave any substantial scars, and, thus, will be difficult to detect in the fossil record.

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Liostrea roemeri (Ostreida, Bivalvia) attached to Upper Jurassic ammonites of northeastern Mexico

Cited by 13 publications

References 35 publications

A new mode of ammonite preservation – implications for dating of condensed phosphorite deposits

A new mode of ammonite preservation – implications for dating of condensed phosphorite deposits

Recent Advances in Geomathematics: Croatian Examples from Subsurface Geological Mapping and Biostatistics

Deep‐water cirripedes colonizing dead shells of the cephalopod Nautilus macromphalus from New Caledonian waters

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