Ammonoid Taphonomy

Maeda, Haruyoshi; Seilacher, Adolf

doi:10.1007/978-1-4757-9153-2_14

Cited by 71 publications

(75 citation statements)

References 59 publications

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“…The sequence of concretion formation has been studied at many sites, e.g., Reeside and Cobban (1960) Berner, 1968;Allison, 1990;and Maeda and Seilacher, 1996). These studies suggest that the cementation of concretions occurred at shallow burial depths below the sedimentwater interface.…”

Section: Mode Of Occurrencementioning

confidence: 99%

“…These issues have been widely discussed with respect to benthic organisms (e.g., Kidwell, 1991;Kidwell and Bosence, 1991). Ammonites pose special problems because they lived in the water column and, by definition, represent transported or ''exotic'' elements, necessarily creating a mixed fossil assemblage on the sea floor (Maeda and Seilacher, 1996). In addition, ammonites are prone to postmortem drift, in analogy with modern nautilus (House, 1987).…”

Section: Habitatmentioning

confidence: 99%

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Scaphites of the “Nodosus Group” from the Upper Cretaceous (Campanian) of the Western Interior of North America

Landman¹,

Kennedy²,

Cobban

et al. 2010

Bulletin of the American Museum of Natural History

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Section: Mode Of Occurrencementioning

confidence: 99%

Section: Habitatmentioning

confidence: 99%

Scaphites of the “Nodosus Group” from the Upper Cretaceous (Campanian) of the Western Interior of North America

Landman¹,

Kennedy²,

Cobban

et al. 2010

Bulletin of the American Museum of Natural History

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“…6) Resedimented shell preserved as hollow ammonites and hollow phragmocone (i.e., without septa, Seilacher et aI., 1976;Maeda and Seilacher, 1996) continuously filled with macrocrystalline calcite. D) Pelekodites sp.…”

Section: Ammonoid Biostratigraphy and Chronostratigraphymentioning

confidence: 99%

Bajocian ammonoids from Pumani River area (Ayacucho, Peru): Palaeobiogeographical and palaeoenvironmental implications for the Arequipa Basin

Fernández-López

Carlotto

Giraldo

et al. 2014

Journal of South American Earth Sciences

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“…Due to the fact that draught filling ( = draft filling ;Seilacher 1968;Maeda & Seilacher 1996;Olivero 2007) is absent, which led to a preserved primary phosphatic siphuncle, a fast deposition and sedimentation after death can be assumed. Only a few specimens of the genera Kasimlarceltites, Klipsteinia, Anasirenites and Megaphyllites show suture lines.…”

Section: Materials and Fossil Assemblagementioning

confidence: 99%

“…waterlogging and sinking versus surfacing and floating; see Seilacher 1968;Olivero 2007) in ammonoid shells depends mostly on the water depth and hydrostatic pressure (Maeda & Seilacher 1996) when the animal dies. This interpretation is contrasted to the occurrence of some specimens showing different sedimentinfillings of the body chambers as compared to the surrounding and embedding finer limestone.…”

Section: Biostratinomy and Taphonomymentioning

confidence: 99%

Taphonomic implications from Upper Triassic mass flow deposits: 2-dimensional reconstructions of an ammonoid mass occurrence (Carnian, Taurus Mountains, Turkey)

Mayrhofer¹

2014

Geologica Carpathica

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Ammonoid mass occurrences of Late Triassic age were investigated in sections from A şağlyaylabel and Yukarlyaylabel, which are located in the Taurus Platform-Units of eastern Turkey. The cephalopod beds are almost monospecific, with > 99.9 % of individuals from the ceratitic genus Kasimlarceltites, which comprises more than hundreds of millions of ammonoid specimens. The ontogenetic composition of the event fauna varies from bed to bed, suggesting that these redeposited shell-rich sediments had different source areas. The geographical extent of the mass occurrence can be traced over large areas up to 10 km2. Each of the Early Carnian (Julian 2) ammonoid mass occurrences signifies a single storm (e.g. storm-wave action) or tectonic event (e.g. earthquake) that caused gravity flows and turbidity currents. Three types of ammonoid accumulation deposits are distinguished by their genesis: 1) matrix-supported floatstones, produced by low density debris flows, 2) mixed floatstones and packstones formed by high density debris flows, and 3) densely ammonoid shell-supported packstones which result from turbidity currents. Two-dimensional calculations on the mass occurrences, based on sectioning, reveal aligned ammonoid shells, implying transport in a diluted sediment. The ammonoid shells are predominantely redeposited, preserved as mixed autochthonous/parautochnonous/ allochthonous communities based on biogenic and sedimentological concentration mechanisms ( = in-situ or post-mortem deposited). This taphonomic evaluation of the Kasimlarceltites beds thus reveals new insights into the environment of deposition of the Carnian section, namely that it had a proximal position along a carbonate platform edge that was influenced by a nearby shallow water regime. The Kasimlarceltites-abundance zone is a marker-zone in the study area, developed during the drowning of a shallow water platform, which can be traceable over long distances.

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Ammonoid Taphonomy

Cited by 71 publications

References 59 publications

Scaphites of the “Nodosus Group” from the Upper Cretaceous (Campanian) of the Western Interior of North America

Scaphites of the “Nodosus Group” from the Upper Cretaceous (Campanian) of the Western Interior of North America

Bajocian ammonoids from Pumani River area (Ayacucho, Peru): Palaeobiogeographical and palaeoenvironmental implications for the Arequipa Basin

Taphonomic implications from Upper Triassic mass flow deposits: 2-dimensional reconstructions of an ammonoid mass occurrence (Carnian, Taurus Mountains, Turkey)

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