Upper Campanian (Upper Cretaceous) cephalopods from the Parras Shale near Saucedas, Coahuila, Mexico

Upper Campanian (Upper Cretaceous) cephalopods from the Parras Shale near Saucedas, Coahuila, Mexico
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墨西哥科阿韦拉州索达斯附近帕拉斯页岩中的上坎帕尼亚(上白垩纪)头足类动物

DOI:
10.1016/j.jsames.2015.07.013
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发表时间:
2015
影响因子:
1.8
通讯作者:
Espinosa
Espinosa
中科院分区:
地球科学4区
文献类型:
--
作者:
Stinnesbeck;Ventura;Espinosa

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本文报道了采自墨西哥科阿韦拉州南部Saucedas上白垩统Parras页岩的72个菊石和鹦鹉螺化石标本,分别归属于12属14种。该组合代表了三至四个上坎帕尼亚期生物带,从西部内陆、下上部坎帕尼亚期的Teloceras jenneyi到最上部的特提斯期的Nostoceras hyattibiozone,EutrephocerasirritilasiandTrachyscaphitessp. Baculites taylorensisis仅分布于墨西哥湾沿岸北方和E. didymoceras donezipenda为欧美南部种,而Botrychoceras polyplocumandN. Diplomoceras cylindraceum和Phyllopachyceras forbesipendium是世界性的类群,主要出现在马斯特里赫特阶;它们在Saucedas的记录是这些物种中北美最古老的。一个明确的古生物地理信号被确定在上坎帕尼亚菊石组合Saucedas的变化,从限制到地理上广泛的动物群。这表明将墨西哥湾沿岸与世界其他地区隔开的动物屏障逐渐消失。
72 specimens of ammonites and the nautilidEutrephoceras, collected from the upper Cretaceous Parras Shale at Saucedas in southern Coahuila, Mexico, are here assigned to twelve genera and fourteen species. The assemblage represents three to four upper Campanian biozones reaching from the Western Interior lower upper CampanianExiteloceras jenneyito the uppermost Campanian TethyanNostoceras hyattibiozone.Eutrephoceras irritilasiandTrachyscaphitessp. are endemic taxa, whileBaculites taylorensisis restricted to the northern Gulf of Mexico Coast andE. jenneyi,Oxybeloceras crassumandSolenoceras elegansare Western Interior Seaway elements.Didymoceras donezianumis a southern Euramerican species, whileBostrychoceras polyplocumandN. hyattioccur throughout lower and middle latitudes.Diplomoceras cylindraceumandPhyllopachyceras forbesianumare cosmopolitan taxa with their main occurrences in the Maastrichtian; their record at Saucedas is the oldest of these species in North America. A clear paleobiogeographic signal is identified in the upper Campanian ammonite assemblages at Saucedas by a change from restricted towards geographically widespread faunas. This suggests gradual disappearence of faunal barriers which separated the Gulf Coast from the rest of the world.
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