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Full-Text Articles in Physical Sciences and Mathematics
The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus Dobiei Schwimmer, Stewart & Williams, 1994, And Its Bearing On Latimerioidei Interrelationships, David R. Schwimmer
The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus Dobiei Schwimmer, Stewart & Williams, 1994, And Its Bearing On Latimerioidei Interrelationships, David R. Schwimmer
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We present a redescription of Megalocoelacanthus dobiei, a giant fossil coelacanth from Upper Cretaceous strata of North America. Megalocoelacanthus has been previously described on the basis of composite material that consisted of isolated elements. Consequently, many aspects of its anatomy have remained unknown as well as its phylogenetic relationships with other coelacanths. Previous studies have suggested that Megalocoelacanthus is closer to Latimeria and Macropoma than to Mawsonia. However, this assumption was based only on the overall similarity of few anatomical features, rather than on a phylogenetic character analysis. A new, and outstandingly preserved specimen from the Niobrara Formation in Kansas …
Overview Of The Strategic And Structural Evolution Of The Talladega Slate Belt, Alabama Appalachians, Clinton Barineau
Overview Of The Strategic And Structural Evolution Of The Talladega Slate Belt, Alabama Appalachians, Clinton Barineau
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The allochthonous Talladega belt of eastern-northeastern Alabama and northwestern Georgia is a northeast striking, fault bounded block of lower greenschist facies metasedimentary and metaigneous rocks that formed along the margin of Laurentia at or outboard of the seaward edge of the Alabama promontory. Bounded by metamorphic rocks of the higher grade Neoproterozoic(?) to Carboniferous eastern Blue Ridge on the southeast and unmetamorphosed to anchimetamorphic Paleozoic rocks of the Appalachian foreland on the northwest, the Talladega belt includes shelf facies rocks of the latest Neoproterozoic/earliest Cambrian Kahatchee Mountain Group, Cambrian-Ordovician Sylacauga Marble Group, and the latest Silurian(?) to uppermost Devonian/earliest Mississippian …
Paleobiology And Geochemistry Of Siliceous Concretions With Trilobites And Brooksella, David R. Schwimmer
Paleobiology And Geochemistry Of Siliceous Concretions With Trilobites And Brooksella, David R. Schwimmer
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No abstract provided.
Strain Analysis On The Sub-Lay Dam Unconformity Near Jumbo, Alabama, Clinton Barineau
Strain Analysis On The Sub-Lay Dam Unconformity Near Jumbo, Alabama, Clinton Barineau
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No abstract provided.
The Talladega And Ashland-Wedowee-Emuckfaw Belts Of Alabama: Geological Overview, Clinton Barineau
The Talladega And Ashland-Wedowee-Emuckfaw Belts Of Alabama: Geological Overview, Clinton Barineau
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No abstract provided.
An Aphelaspis Zone (Upper Cambrian, Paibian) Trilobite Faunule In The Central Conasauga River Valley, North Georgia, Usa, David R. Schwimmer
An Aphelaspis Zone (Upper Cambrian, Paibian) Trilobite Faunule In The Central Conasauga River Valley, North Georgia, Usa, David R. Schwimmer
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Middle and Upper Cambrian strata (Cambrian Series 3 and Furongian) in the southernmost Appalachians (Tennessee to Alabama) comprise the Conasauga Formation or Group. Heretofore, the youngest reported Conasauga beds in the Valley and Ridge Province of Georgia were of the late Middle Cambrian (Series 3: Drumian) Bolaspidella Zone, located on the western state boundary in the valley of the Coosa River. Two new localities sited eastward in the Conasauga River Valley, yield a diagnostic suite of trilobites from the Upper Cambrian Aphelaspis Zone. Very abundant, polymeroid trilobites at the primary locality are referable to Aphelaspis brachyphasis, which is a species …
Characteristics, Extent, And Tectonic Significance Of A Middle Ordovician Back-Arc Basin In The Southern Appalachian Blue Ridge, Clinton Barineau
Characteristics, Extent, And Tectonic Significance Of A Middle Ordovician Back-Arc Basin In The Southern Appalachian Blue Ridge, Clinton Barineau
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A growing body of evidence suggests that a number of Ordovician-aged stratigraphic units in separate lithotectonic belts of the southern Appalachian orogen are genetically related, having formed in a back-arc setting on the Laurentian plate. Research on the Hillabee Greenstone in the Talladega belt and Pumpkinvinve Creek Formation and related bimodal metavolcanic rocks in the Dahlonega Gold belt suggest a similar temporal, spatial, and tectonic origin. Additionally, recent Ordovician isotopic ages for detrital zircons from the Wedowee and Emuckfaw Groups in the Ashland-WedoweeEmuckfaw belt of Alabama (eastern Blue Ridge), as well as stratigraphic correlations of these units with metasedimentary and …