Article
Paleontology
Till Soete, Ralph Thomas Becker
Summary: This article presents the research findings and analysis of the Frasnian ammonoid fauna from Biidesheim. The fauna contains 25 species of tornoceratid ammonoids, including seven new species and one new genus. The study reveals a remarkably high alpha diversity of tornoceratid ammonoids in the upper Frasnian, which remained high until the Upper Kellwasser Event.
PALAEONTOGRAPHICA ABTEILUNG A-PALAOZOOLOGIE-STRATIGRAPHIE
(2022)
Article
Paleontology
Till Soete, Ralph thomas Becker
Summary: The Frasnian ammonoid fauna from Budesheim in the Eifel Mountains has been studied for nearly 200 years but the tornoceratids have never been subject to a monographic study. A new fauna from the Upper Devonian I-K level yielded a large number of tornoceratid specimens, which were investigated in terms of taxonomy and morphometry. The results show that tornoceratid ammonoids in the upper Frasnian have exceptionally high alpha diversity, similar to the local gephuroceratoids.
PALAEONTOGRAPHICA ABTEILUNG A-PALAOZOOLOGIE-STRATIGRAPHIE
(2022)
Article
Paleontology
Dieter Korn
Summary: The Late Devonian ammonoid species Tornoceras frechi has been revised and two new species have been described based on material from the Frasnian-Famennian boundary interval of the Anti-Atlas. Phoenixites is considered a subjective synonym of Tornoceras, and Tornoceras frechi is no longer an index fossil for the earliest ammonoid zone of the Famennian in the Anti-Atlas.
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2021)
Review
Biodiversity Conservation
R. Thomas Becker, Sven Hartenfels, Sandra I. Kaiser
Summary: This study reviews 30 Devonian-Carboniferous Boundary sections of the Rhenish Slate Mountains and adjacent subsurface areas, focusing on litho-, event, conodont, ammonoid, sequence, and chemostratigraphy. It refines the terminology of the Hangenberg Crisis Interval and distinguishes various conodont and ammonoid zones within different intervals. The study also highlights the subdivision and characteristics of different subzones within the defined intervals.
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2021)
Article
Geology
Attila Voros, Gyula Konrad, Krisztina Sebe
Summary: Recent findings in the Zuhanya Limestone Formation in the Mecsek Mountains of south Hungary provide evidence of nautiloid and ammonoid fossils from the Middle Triassic. These findings support previous assumptions about the paleogeographical location of the Mecsek region during this time period.
RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
(2022)
Article
Multidisciplinary Sciences
Swapan K. Sahoo, Geoffrey J. Gilleaudeau, Kathleen Wilson, Bruce Hart, Ben D. Barnes, Tytrice Faison, Andrew R. Bowman, Toti E. Larsen, Alan J. Kaufman
Summary: The Devonian-Carboniferous transition signifies a significant shift in the surface environment, primarily attributed to changes in ocean-atmosphere oxidation states resulting from the proliferation of land plants. This led to changes in the hydrological cycle, continental weathering, glacioeustasy, eutrophication, anoxic expansion in epicontinental seas, and mass extinction events. Our comprehensive geochemical dataset from the Bakken Shale in North America documents the stepwise transgressions of toxic euxinic waters into shallow oceans, contributing to Late Devonian extinction events.
Article
Paleontology
Sophie Marie Beck, Kenneth De Baets, Christian Klug, Dieter Korn
Summary: The research suggests that septal crowding alone is not enough to identify adulthood in ammonoids; intermediate septal crowding is common and occurs in various growth stages. Changes in septal distances during ontogeny are mainly a passive reaction likely caused by fluctuating environmental conditions.
SWISS JOURNAL OF PALAEONTOLOGY
(2021)
Article
Paleontology
Dieter Korn
Summary: This study revises the ammonoid species Tornoceras types, describing their different morphologies in various geological periods. New related species were discovered, enriching the diversity of this group. The research findings indicate that both Tornoceras and Linguatornoceras survived the Kellwasser crisis.
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2021)
Article
Paleontology
Junjun Song, Bing Huang, Wenkun Qie
Summary: This paper presents the first study of morphological variation in Devonian Platycopida ostracods using geometric morphometrics. The study identifies substantial shape variation in Cribroconcha honggulelengensis from the Upper Devonian strata, demonstrating a remarkable change in juveniles between stages A-3 and A-2. The results also show allometric growth patterns and ontogenetic changes in the body plan of this species.
PAPERS IN PALAEONTOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Qing Chen, Xu Chen, Linna Zhang, Lucy A. Muir
Summary: By analyzing the morphological features of tubarium, the classification of Early Devonian graptolites has been revised, merging the previously identified eight species into four. The co-occurrence of U. thomasi and U. yukonensis indicates a late Pragian to early Emsian age for these graptolites.
GEOLOGICAL JOURNAL
(2021)
Article
Ecology
Carla Figus, Rita Sorrentino, Kristian J. Carlson, Antony Colombo, Eugenio Bortolini, Federico Bernardini, Igor Erjavec, Tamas Hajdu, Tamas Szeniczey, Orsolya Mateovics-Laszlo, Ildiko Pap, Claudio Tuniz, Mario Novak, Maria Giovanna Belcastro, Timothy M. Ryan, Stefano Benazzi
Summary: This study analyzed the morphological and internal changes of the talus during late ontogeny and adolescence. Results showed that the shape and orientation of the talus change as its overall size increases. Additionally, the internal trabecular bone structure varies among different age classes.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Geosciences, Multidisciplinary
Yixin Cui, Bing Shen, Yuanlin Sun, Haoran Ma, Jieqiong Chang, Fangbing Li, Xianguo Lang, Yongbo Peng
Summary: The Frasnian-Famennian mass extinction event is characterized by two positive carbonate carbon isotope excursions and global deposition of black shale and bituminous limestone. Evidence from South China indicates a pulse of seafloor oxygenation at the F-F boundary, rather than pervasive oceanic anoxia.
EARTH-SCIENCE REVIEWS
(2021)
Article
Multidisciplinary Sciences
Eva Alexandra Bischof, Nils Schlueter, Dieter Korn, Jens Lehmann
Summary: Ammonoids reached their peak diversity during the Triassic period, with representatives of the Ceratitidae family dominating the early Middle Triassic stage. High taxonomic diversity may not necessarily correlate with morphological disparity, as seen in the Anisian ceratitids in Nevada. The study used geometric morphometrics to analyze ontogenetic cross-sections of ammonoids and found that developmental changes contribute to morphological diversification, challenging traditional species distinction based solely on adult characters. Additionally, the traditional nomenclatoric approach for the Anisian cephalopod assemblages in Nevada is considered reasonably accurate.
Article
Geosciences, Multidisciplinary
Jobst Wendt
Summary: The eastern Anti-Atlas of Morocco is one of the most completely exposed and perfectly documented biostratigraphic records of the entire Devonian worldwide. The area is differentiated into shallow basins, pelagic platforms, and land areas, with the Tafilalt Platform being the dominant paleogeographic feature providing the best-documented biostratigraphic record through the entire Devonian.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Article
Paleontology
Merle Greif, James H. Nebelsick, Christian Klug
Summary: This study estimates the number and biomass of ammonoids preserved in the eastern Anti-Atlas region, specifically in the Tafilalt and Maider basins. The analysis of samples suggests a high abundance of ammonoids in the Famennian strata, with estimated annual accumulation and total palaeo-biomass values. The ecological role and reproductive rates of these small and abundant ammonoids from the early and middle Famennian periods are also discussed.
ACTA PALAEONTOLOGICA POLONICA
(2022)
Article
Geology
Xu Dai, Dieter Korn, Haijun Song
Summary: Ammonoids suffered a diversity bottleneck during the Permian-Triassic mass extinction and rapidly diversified in the Early Triassic. The survivors of the extinction were mainly smooth and weakly ornamented forms, contrasting with the coarsely ornamented forms dominating before the extinction. The morphological shift from coarsely ornamented to smooth forms during the extinction possibly indicates an ecological turnover of ammonoids.
Article
Paleontology
Michel Schmidt, Dieter Korn
Summary: A large suite of Early Bajocian Stephanoceras specimens from Evrecy, Normandy, France, shows wide variation in conch and sculpture, with major problems in separating species within the assemblage. The study reveals weak correlation between conch parameters and sculpture, but dimorphs can be separated based on sudden changes in conch parameters during ontogeny. The onset of these changes varies between 40 and 75 mm conch diameter within the assemblage.
Article
Paleontology
Dieter Korn, Abbas Ghaderi, Lea Devaere, Mohammad Khanehbad
Summary: This study reports a small ammonoid assemblage from Carboniferous-Permian boundary strata in the Tabas region of east-central Iran, describing two new species. The assemblage spans from the Frasnian to Early Permian age, indicating deep erosion and reworking in the basin.
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2021)
Article
Paleontology
Dieter Korn
Summary: The Late Devonian ammonoid species Tornoceras frechi has been revised and two new species have been described based on material from the Frasnian-Famennian boundary interval of the Anti-Atlas. Phoenixites is considered a subjective synonym of Tornoceras, and Tornoceras frechi is no longer an index fossil for the earliest ammonoid zone of the Famennian in the Anti-Atlas.
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2021)
Article
Plant Sciences
Dieter Korn, Juergen Bockwinkel
Summary: The study revises the Pharciceratina of the Red Ironstone Formation from the Dillenburg area, introducing a new genus and several new species, as well as proposing neotypes for specific species. The stratigraphic distribution of the genera is discussed and categorized into three assemblages.
EUROPEAN JOURNAL OF TAXONOMY
(2021)
Article
Paleontology
Lea Devaere, Dieter Korn, Abbas Ghaderi, Ulrich Struck, Alireza K. Bavandpur
Summary: The study on small shelly fossils in the lower Cambrian of northern Iran provides new data from this understudied area, allowing the distinction of two successive microfaunal assemblages.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Plant Sciences
Dieter Korn, Luyi Miao, Jurgen Bockwinkel
Summary: This article describes a coiled nautiloid assemblage from the Dalle a Merocanites formation in western Algeria, consisting of nine species from the family Trigonoceratidae. It is the most diverse Carboniferous nautiloid assemblage known from North Africa, but less diverse than the assemblages from Belgium and Ireland.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Biodiversity Conservation
Franziska Heuer, Lucyna Leda, Hemen Moradi-Salimi, Jana Gliwa, Vachik Hairapetian, Dieter Korn
Summary: The geological section at Baghuk Mountain in Central Iran provides excellent exposures of fossiliferous marine sedimentary successions from the Late Permian to Early Triassic. Detailed analysis of microfacies changes across the Permian-Triassic boundary reveals that carbonate production and biogenic activity ceased simultaneously during the main mass extinction event towards the end of the Permian period.
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2022)
Article
Plant Sciences
Dieter Korn, Juergen Bockwinkel
Summary: This study revises the Tornoceratina ammonoids from the Red Ironstone Formation of the Dillenburg area in the eastern Rhenish Mountains. It re-describes several species and proposes two new genera and one new species. Additionally, a new species from the Anti-Atlas region of Morocco is described and compared with known species.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Plant Sciences
Martina Aubrechtova, Dieter Korn
Summary: This study revises the Ordovician ectocochleate cephalopods of the Lituitida order, mainly found in Germany, Poland, and the Kaliningrad Region of Russia. A total of 28 species belonging to seven genera were identified, with 11 newly described species. The concept of several taxa described in the 19th century was refined, and neotypes were proposed for two ambiguous species.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Plant Sciences
Dieter Korn, Juergen Bockwinkel
Summary: This study describes coiled nautiloids from five different localities in southern Algeria, which are dated to the Tournaisian and early to middle Viséan stages of the Early Carboniferous. The researchers discovered new genera and species, providing important contributions to the study of Early Carboniferous biota in the region.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Plant Sciences
Dieter Korn, Jurgen Bockwinkel
Summary: The ammonoids of the suborder Gephuroceratina from the Roteisenstein (Red Ironstone) Formation in the area around Dillenburg have been revised, with a new species described and several other species revised. The stratigraphic distribution of the genera is discussed and assigned to three distinct assemblages based on their age.
EUROPEAN JOURNAL OF TAXONOMY
(2022)
Article
Paleontology
Dieter Korn, Lucyna Leda, Franziska Heuer, Hemen Moradi Salimi, Elham Farshid, Amir Akbari, Martin Schobben, Abbas Ghaderi, Ulrich Struck, Jana Gliwa, David Ware, Vachik Hairapetian
Summary: The Permian-Triassic boundary sections at Baghuk Mountain in Central Iran are studied for their lithological succession, biostratigraphy, and chemostratigraphy. Various fossil assemblages, including conodonts, ammonoids, and nautiloids, are analyzed to establish a high-resolution stratigraphy. Carbon isotope data reveal a continuous late Changhsingian negative excursion across the boundary clay, with the lightest values at the base of the Triassic.
Article
Paleontology
Jana Gliwa, Marie-Beatrice Forel, Sylvie Crasquin, Abbas Ghaderi, Dieter Korn
Summary: The study of ostracods in the Aras Valley section of northwest Iran revealed a significant turnover in species composition during the end-Permian mass extinction event, from a low-diversity Fabalicypris-dominated community to a more diverse Bairdiacypris-dominated community. This turnover coincided with a significant temperature increase and suggests that environmental changes, such as thermal stress, may have influenced ostracod assemblages prior to the extinction event.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Paleontology
Luyi Miao, Xu Dai, Dieter Korn, Arnaud Brayard, Jing Chen, Xiaokang Liu, Haijun Song
Summary: The highly diverse Changhsingian nautiloid assemblage in Gujiao, Guizhou, consists of nine genera, five taxa, and nine species, including one new genus and three new species. This assemblage is the most diverse among 52 sites worldwide and features cosmopolitan genera such as Pleuronautilus, Tainoceras, and Liroceras.
PAPERS IN PALAEONTOLOGY
(2021)
