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Johnny A. Waters
Appalachian State University
DevonianGeologyCarboniferousPaleontologyBlastoid
79Publications
14H-index
628Citations
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Publications 80
Newest
#2Johnny A. WatersH-Index: 14
Last. Erika KidoH-Index: 6
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#1Jennifer E. Bauer (Florida Museum of Natural History)
#2Johnny A. Waters (ASU: Appalachian State University)H-Index: 14
Last. Colin D. Sumrall (UT: University of Tennessee)H-Index: 19
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#1Sarah K. Carmichael (ASU: Appalachian State University)H-Index: 7
#2Johnny A. Waters (ASU: Appalachian State University)H-Index: 14
Last. Erika Kido (University of Graz)H-Index: 6
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Abstract The Late Devonian (383-359 Ma) was a time of prolonged climate instability with catastrophic perturbation of global marine ecosystems at the Frasnian-Famennian (F-F) and the Devonian-Carboniferous (D-C) boundaries. The causes and mechanisms of anoxia and extinction at the F-F interval are not clearly delineated, and alternative explanations for virtually every aspect of this interval are still intensely debated. In many (but not all) locations, the F-F interval is characterized by two d...
1 CitationsSource
#1Olivia C. Paschall (ASU: Appalachian State University)H-Index: 1
#2Sarah K. Carmichael (ASU: Appalachian State University)H-Index: 7
Last. Allison Dombrowski (ASU: Appalachian State University)H-Index: 1
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Abstract The Devonian-Carboniferous transition (359 Ma) was a time of extreme climate and faunal change and is associated with the end-Devonian biodiversity crisis. The transition is characterized by transgressive/regressive cycles, which culminated in the onset of widespread ocean anoxia (the Hangenberg Black Shale event) and a remarkable sea-level fall close to the Devonian-Carboniferous boundary (the Hangenberg Sandstone event); together these are known as the Hangenberg Crisis. The Hangenber...
5 CitationsSource
#1Thomas J. Suttner (University of Graz)H-Index: 9
#2Erika Kido (University of Graz)H-Index: 6
Last. Y.A. Gatovsky (MSU: Moscow State University)
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Abstract Upper Devonian marine deposits of the Baruunhuurai Terrane in western Mongolia represent island arc settings, which yielded a diverse conodont assemblage of 30 taxa, including species of Ancyrognathus (as well as one new species), Icriodus, Mehlina, Polygnathus and Palmatolepis. Biodiversity analysis of Ancyrognathus, Pelekysgnathus, Mehlina and Icriodus shows that the Mongolian conodont assemblage consists of two endemic and few cosmopolitan taxa. Representatives of the otherwise globa...
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Last. Toshifumi KomatsuH-Index: 10
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#1David L. MeyerH-Index: 19
#3Johnny A. WatersH-Index: 14
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Two Emsian species of crinoids, Kroppocrinus garamdouaraensis n. sp. and Elicrinus? weyeri, and two species of blastoids, Pentremitidea pailleti (Emsian) and Hyperoblastus clavatus (Givetian), are described herein from the Tafilalt of Morocco. The crinoid records expand the sparse record of Devonian crinoids within Morocco; the blastoids represent the first report of this class from the Anti-Atlas and probably northern Africa. Key words: Crinoidea, Blastoidea, Emsian, Givetian, Anti-Atlas, Tafil...
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#1Stephen K. Donovan (Naturalis)H-Index: 20
#2Johnny A. Waters (ASU: Appalachian State University)H-Index: 14
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Trombonicrinus (col.) hanshessi gen. et sp. nov. is a crinoid species of unusual morphology and is based solely on the stem. It comes from the (probably Lower) Devonian of Tafraoute, Anti Atlas Mountains, Morocco. It is a long crinoid stem of circular section, tapering distally throughout, with a tight curvature through 180o between the mesistele and proxistele; attachment is distally by short, pointed, unsegmented pseudoradices. The overall appearance is reminiscent of the slide of a trombone. ...
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#3Colin D. SumrallH-Index: 19
Last. Johnny A. WatersH-Index: 14
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