Global events of the Late Paleozoic (Early Devonian to Middle Permian): A review

2019 ◽  
Vol 531 ◽  
pp. 109259 ◽  
Author(s):  
Wenkun Qie ◽  
Thomas J. Algeo ◽  
Genming Luo ◽  
Achim Herrmann
Keyword(s):  
Middle Permian ◽  
Late Paleozoic ◽  
Early Devonian ◽  
Global Events

Permian Hyolithida from Australia: the last of the hyoliths?

2009 ◽  
Vol 83 (1) ◽  
pp. 147-152 ◽  
Author(s):  
John M. Malinky
Keyword(s):  
Population Size ◽  
Upper Permian ◽  
Late Paleozoic ◽  
Early Cambrian ◽  
Progressive Decline ◽  
Early Devonian ◽  
Extinction Event ◽  
Permian Extinction ◽  
Abundance And Diversity ◽  
Geologic Record

Class Hyolitha Marek, 1963 encompassing the Order Hyolithida Sysoev, 1957 (Early Cambrian to Upper Permian) and Order Orthothecida Marek, 1966 (Early Cambrian to Early Devonian) consists of a group of conical, calcareous-shelled invertebrates of controversial affinity. One opponent view holds that hyoliths may be reasonably accommodated under the Phylum Mollusca (Malinky and Yochelson, 2007 and references therein), whereas another supports separate phylum status under the name Hyolitha (Pojeta, 1987 and references therein). Hyolith abundance and diversity attain a maximum in the Cambrian, followed by a progressive decline up to their Permian extinction (Fisher, 1962; Wills, 1993). Their demise was part of the extinction event of the Late PermianlEarly Triassic. The cause(s) of this event remains controversial (Erwin et al., 2002), and no imprint remains in the geologic record of the specific circumstances surrounding the disappearance of the hyoliths, though it is highly probable that reduced population size was a contributing factor. Given the overall rarity of Late Paleozoic hyoliths, every occurrence is worthy of note to better understand patterns of hyolith diversity and abundance in the Late Paleozoic, the geographic and stratigraphic distribution of hyolith taxa and circumstances related to their extinction. The species from the Upper Permian described herein is among the youngest, if not the youngest, members of class Hyolitha.

The amalgamation of Pangea: Paleomagnetic and geological observations revisited

2020 ◽  
Author(s):  
Lei Wu ◽  
J. Brendan Murphy ◽  
Cecilio Quesada ◽  
Zheng-Xiang Li ◽  
John W.F. Waldron ◽  
...  
Keyword(s):  
Selection Criteria ◽  
Late Paleozoic ◽  
Geological Data ◽  
High Quality ◽  
Early Devonian ◽  
Polar Wander ◽  
Middle Ordovician ◽  
Oblique Convergence ◽  
Q Factors ◽  
European Variscides

The supercontinent Pangea formed by the subduction of the Iapetus and Rheic oceans between Gondwana, Laurentia, and Baltica during mid-to-late Paleozoic times. However, there remains much debate regarding how this amalgamation was achieved. Most paleogeographic models based on paleomagnetic data argue that the juxtaposition of Gondwana and Laurussia (Laurentia-Baltica) was achieved via long-lasting highly oblique convergence in the late Paleozoic. In contrast, many geology-based reconstructions suggest that the collision between the two continents was likely initiated via a Gondwanan promontory comprising the Iberian, Armorican, and Bohemian massifs, and parts of the basement units in the Alpine orogen during the Early Devonian. To help resolve this discrepancy, we present an updated compilation of high-quality paleopoles of mid-to-late Paleozoic ages (spanning Middle Ordovician and Carboniferous times) from Gondwana, Laurentia, and Baltica. These paleopoles were evaluated with the Van der Voo selection criteria, corrected for inclination error where necessary, and were used to revise their apparent polar wander (APW) paths. The revised APW paths were constructed using an innovative approach in which age errors, A95 ovals, and Q-factors of individual paleopoles are taken into account. By combining the resulting APW paths with existing geological data and field relationships in the European Variscides, we provide mid-to-late Paleozoic paleogeographic reconstructions which indicate that the formation of Pangea was likely initiated at 400 Ma via the collision between Laurussia and a ribbon-like Gondwanan promontory that was itself formed by a scissor-like opening of the Paleotethys Ocean, and that the amalgamation culminated in the mostly orthogonal convergence between Gondwana and Laurussia.

Two Mississippian Caenogastropod limpets from Australia and their meaning for the ancestry of the Caenogastropoda

2008 ◽  
Vol 82 (1) ◽  
pp. 183-187 ◽  
Author(s):  
Alex Cook ◽  
Alexander Nützel ◽  
Jiri Frýda
Keyword(s):  
Czech Republic ◽  
Early Carboniferous ◽  
Larval Shell ◽  
Late Paleozoic ◽  
Late Devonian ◽  
Early Devonian ◽  
Biotic Crisis ◽  
Prague Basin ◽  
The Family

Two new limpets with a caenogastropod-type larval shell are described from the Mississippian (Early Carboniferous) of Australia and assigned to Australoscutula n. gen. of the family Pragoscutulidae. This family has previously been reported only from the Early Devonian of Europe (Czech Republic, Prague Basin). Therefore, it survived the Late Devonian biotic crisis. the fact that one of the earliest certain caenogastropods has a patelliform shell is noteworthy given most other Middle to Late Paleozoic caenogastropods are high-spired or fusiform. Pragosutulidae are interpreted as an early patelliform caenogastropod offshoot derived from coiled ancestors. the Pragoscutulidae are the oldest gastropod limpets with well-preserved larval shells. Their teleoconch is entirely limpet-shaped without helicoid coiling. However, the helicoid turbiniform larval shells suggests that this group evolved from an ancestor with turbiniform or even high-spired adult shell. Moreover, the multi-whorled dextral larval shells show that Pragoscutulidae are Caenogastropoda and document that early Caenogastropoda displayed considerable disparity.

American Gothic Culture

2016 ◽  
Author(s):  
Joel Faflak
Keyword(s):  
American Culture ◽  
First Century ◽  
Serial Killers ◽  
Dark Side ◽  
Eighteenth Century Literature ◽  
Repressed Memories ◽  
American Gothic ◽  
Film And Television ◽  
Frontier Narratives ◽  
Global Events

This Companion surveys the traditions and conventions of the dark side of American culture - its repressed memories, its anxieties and panics, its fears and horrors, its obsessions and paranoias. Featuring new critical essays by established and emerging academics from a range of national backgrounds, this collection offers new discussions and analyses of canonical and lesser-known literary and other works. Its scope ranges from the earliest manifestations of American Gothic traditions in frontier narratives and colonial myths, to its recent responses to contemporary global events. Moving from analyses of eighteenth-century literature to twenty-first century video games, and touching upon visual art, film, and television, serial killers, monsters, education and cityscapes, this Companion aims to demonstrate the centrality of the gothic to American culture writ large through four key sections: Gothic Histories, Gothic Identities; Gothic Genres, Gothic Sites; Gothic Media; and American Creatures.

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