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TitleConodonts from the mid-Carboniferous boundary GSSP at Arrow Canyon, Nevada, USA
AuthorLane, H R; Qi, Y; Wang, Z; Nemyrovska, T I; Richards, B C; Hu, K
SourceMicropaleontology vol. 65, no. 2, 2019 p. 77-104
Alt SeriesNatural Resources Canada, Contribution Series 20190091
PublisherMicropaleontology Press
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
AreaNevada; Arrow Canyon; United States of America
Lat/Long WENS-115.0000 -114.0000 37.0000 36.0000
Lat/Long WENS-115.0000 -114.0000 37.0000 36.0000
Subjectsstratigraphy; paleontology; systematic stratigraphy; biostratigraphy; systematic paleontology; micropaleontology; microfossils; conodonts; fossil descriptions; phylogeny; evolution; bedrock geology; lithology; sedimentary rocks; grainstones; limestones; shales; mudstones; siltstones; sandstones; cherts; nodules; biofacies; paleogeography; Global Stratotype Section and Point (GSSP); Mid-Carboniferous Boundary; Bird Spring Formation; Declinognathodus noduliferus (Ellison and Graves) sensu lato; Adetognathus; Rhachistognathus; Gnathodus; Idiognathoides; Neognathodus; Cavusgnathus; Antler Foreland Basin; Indian Springs Formation; Battleship Wash Formation; Phanerozoic; Paleozoic; Carboniferous; Pennsylvanian; Mississippian
Illustrationsgeoscientific sketch maps; tables; biostratigraphic charts; photographs; photomicrographs; lithologic sections
Released2019 03 15
AbstractThe Global Stratotype Section and Point of the mid-Carboniferous boundary was selected in the Arrow Canyon section within the lower Bird Spring Formation at the first evolutionary appearance of the conodont Declinognathodus noduliferus (Ellison and Graves) sensu lato. The studied boundary beds, spanning a 38.8-m interval from the Upper Mississippian into the Lower Pennsylvanian, occur in bryozoan-brachiopod-crinoidal grainstones/packstones with conodonts and foraminifers. The conodonts of the studied interval belong to the shallow-water Adetognathus-Rhachistognathus biofacies. The Adetognathus and Rhachistognathus species/subspecies A. lautus (=A. gigantus), A. spathus, R. minutus minutus, R. muricatus, R. primus, R. prolixus, R. websteri and transitional forms dominate the succession. Gnathodus girtyi simplex, G. lanei n. sp., G. defectus and transitional forms between them are abundant. The elements of the boundary-marker D. noduliferus s. l. and transitional forms between G. girtyi simplex and D. inaequalis are less common. The occurrences of Idiognathoides spp. are very rare. Neognathodus spp. only occur in the upper part of the studied interval. The mid-Carboniferous boundary stratotype has been studied by many workers but its conodonts have been rarely described systematically. The detailed updated descriptions of the most stratigraphically important taxa are given in this paper. The evolution of Gnathodus, Adetognathus and Rhachistognathus species within the mid-Carboniferous interval is discussed. Four lineages are summarized: 1) C. unicornis, A. unicornis, A. lautus and A. spathus; 2) G. girtyi girtyi, G. g. simplex and D. inaequalis; 3) G. lanei and G. defectus; and 4) R. prolixus, R. muricatus and R. websteri/R. primus/R. minutus.

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