Ammonites on the Brink of Extinction: Diversity, Abundance, and Ecology of the Order Ammonoidea at the Cretaceous/Paleogene (K/Pg) Boundary

Landman, Neil H.; Goolaerts, Stijn; Jagt, John W.M.; Jagt‐Yazykova, Elena A.; Machalski, Marcin

doi:10.1007/978-94-017-9633-0_19

Cited by 31 publications

(29 citation statements)

References 88 publications

(81 reference statements)

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“…The surface water acidification immediately following the Chicxulub impact possibly caused the decimation of the planktic post‐hatching stages of ammonoids (Landman et al . ), which might also hold true for belemnites. The demise of ammonoids was addressed by some researchers in the context of the impact of oceanic acidification on planktic ammonoid hatchlings (Alegret et al .…”

Section: Discussionmentioning

confidence: 90%

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Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications

et al. 2017

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Based on well-preserved belemnites, the ontogenetic trajectories of septal spacing between succeeding chambers were analysed. In the examined species (Passaloteuthis laevigata, Parapassaloteuthis zieteni and Pseudohasitites longiformis) that come from Buttenheim, Germany, and Lixhausen, France, the ontogenetic trajectories of septal spacing follow exponentially increasing trends with no decreasing phase of septal crowding during the earliest ontogenetic stage. The absence of a decreasing trend at the earliest ontogenetic stage is a unique character in contrast with those in modern cuttlefish and ancient and modern nautiloids, in which the decreasing trends are related to hatching events. These ontogenetic septal spacing trends suggest that the belemnite hatchlings had only a protoconch with no chamber. These belemnite hatchlings with no chamber and therefore small embryonic shell diameter are similar to those of ammonoids. Significant difference in a statistical test that compared the protoconch size between the two localities, might suggest that there was limited transportation at the embryonic stage, although it could also just indicate differences in regional environmental conditions, age and/or degree of time averaging which might differ between the examined taxa.

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Section: Discussionmentioning

confidence: 90%

“…Furthermore, both belemnites and ammonoids became extinct at the end of the Cretaceous (see also Landman et al . ; and references therein). Landman () and Kennedy () suggested that the small embryonic shell sizes in ammonoids were one of the major reasons for their extinction at the end of the Cretaceous.…”

Section: Discussionmentioning

confidence: 99%

Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications

et al. 2017

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“…Composite stratigraphical log of the ENCI-HeidelbergCement Group quarry, combined with the Mamelis stratotype. Indicated are the absolute numerical ages deduced from the bioclast-based 400 and 100 kyr eccentricity cycles, in addition to the appearance of ammonites based on Jagt (2002Jagt ( , 2012, Jagt & Felder (2003), Landman et al (2015) and . Species mentioned in literature as 'cf.'…”

Section: Sea-level Fluctuations and Sequence Stratigraphymentioning

confidence: 99%

A bioclast-based astronomical timescale for the Maastrichtian in the type area (southeast Netherlands, northeast Belgium) and stratigraphic implications: the legacy of P.J. Felder

Keutgen

2018

Netherlands Journal of Geosciences

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The present paper, dedicated to the legacy of local geologist–engineer Peter Jozef (Sjeuf) Felder, who died in 2009, confirms his view that bioclasts constitute a valuable tool in the correlation of outcrops and borehole cores across the type area of the Maastrichtian Stage in the vicinity of Maastricht. His approach of interpreting changes in bioclast contents as having been influenced by Milankovitch cyclicity has here been applied successfully to the entire sedimentary complex of Maastrichtian (latest Cretaceous) age in the study area. In the present approach, results are corroborated by index fossils, mainly dinoflagellate cysts but also calcareous nannofossils, which allow correlation with the Stevns-1 core reference section in eastern Denmark. With the exception of local remnants ofBelemnella obtusaZone age, the Maastrichtian Stage in its type area encompasses the last 4.6 Ma of the Cretaceous Period (i.e. theBelemnella sumensis/Acanthoscaphites tridensZone up to the K/Pg boundary). P.J. Felder's bioclast analyses have enabled the detection of twelve 400 kyr eccentricity cycles of Milankovitch cyclicity in the area. However, the section is not continuous; there is a hiatus ofc.700 kyr between the Gulpen and Maastricht formations at the ENCI-HeidelbergCement Group quarry. In addition, smaller hiatuses, usually in the range of several 20 kyr cycles, have been detected in the upper Maastricht Formation.

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“…Fourthly, the upper Maastrichtian part of the section contains abundant macrofossils of latest Cretaceous marine invertebrates, predominantly remains of siliceous sponges and bivalves, including scallops and oysters, but also ammonite moulds (Hoploscaphites constrictus and Baculites sp.). The Lechówka site is among 29 sites known worldwide with a documented record of the stratigraphically youngest ammonites (Landman et al 2014(Landman et al , 2015. Microfossils are represented by foraminifera and dinoflagellate cysts, which have been used for biostratigraphical correlations and environmental interpretation of the Lechówka section (Machalski et al 2016).…”

Section: Scientific and Educational Importance Of The Lechówka Sectionmentioning

confidence: 99%

“…The Lechówka site has significant scientific value which attributes the outcrop to the iconographic content. The section contains the record of the K-Pg mass extiction event and its effects-boundary clay and changes in micro-and macrofossils, including the one of the latest ammonite faunas over the world (Landman et al 2014(Landman et al , 2015. Geochemical and mineralogical features (Brachaniec et al 2014;Szopa et al 2017), relevant for understanding changes during the K-Pg interval, correspond to the documental or even conceptual contents, particulary based on regional or global (the last ammonites and "migrated" Ir anomaly) scale geology.…”

Section: Geoheritage Qualification Of the Lechówka Sitementioning

confidence: 99%

The Cretaceous-Paleogene (K-Pg) Boundary Site at Lechówka—a New Point on the Geoheritage Map of Southeastern Poland

2019

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A geological section exposed in an abandoned quarry at Lechówka near Chełm represents the most complete record of the Cretaceous-Paleogene (K-Pg) boundary interval in Poland. Here, a thin clay layer with impact ejecta marks the K-Pg boundary, making Lechówka the single place in Poland with a record of the impact that killed off the dinosaurs. Based on the geoheritage evaluation, the Lechówka outcrop represents a content value of rank intermediate between II and III with the iconographic, symbolic, documental and conceptual contents on the local, regional or even global scale. In spite of the obvious scientific and educational importance of the site, its present state is insufficient to attract 'ordinary' geotourists. In order to ameliorate this situation, transformation of the quarry into an officially protected geosite is called for. Only after a formal, technical and infrastructural upgrade of the Lechówka site, combined with popularisation in the media, tourist guidebooks, websites and natural history museums, will it have a chance to become a widely recognised point on the Cretaceous geoheritage map of southeastern Poland. The most important and already well-known localities on this map are the subterranean chalk mines at Chełm, a series of quarries around the mediaeval town of Kazimierz Dolny and a defunct underground phosphorite mine at Annopol, where there are plans for an educational-geotouristic centre.

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Ammonites on the Brink of Extinction: Diversity, Abundance, and Ecology of the Order Ammonoidea at the Cretaceous/Paleogene (K/Pg) Boundary

Cited by 31 publications

References 88 publications

Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications

Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications

A bioclast-based astronomical timescale for the Maastrichtian in the type area (southeast Netherlands, northeast Belgium) and stratigraphic implications: the legacy of P.J. Felder

The Cretaceous-Paleogene (K-Pg) Boundary Site at Lechówka—a New Point on the Geoheritage Map of Southeastern Poland

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