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Biochronology and Evolution of Early and Middle Paleocene Nonmarine Mollusca of the Northern Great Plains

北部大平原早、中古新世非海洋软体动物的生物年代学和演化

基本信息

批准号：
8804881
负责人：
Joseph Hartman
金额：
$ 9.08万
依托单位：
University of North Dakota Main Campus
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-07-01 至 1990-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8804881&HistoricalAwards=false
关键词：
Biochronology Evolution Early Middle Paleocene

项目摘要

Nonmarine Mollusca are the most abundant animal macrofossil of Paleocene continental strata in western North America. Their biochronologic potential, however, has yet to be realized due primarily to the lack of study focused on the determination of the biostratigraphic ranges of taxa in thick sequences of strata temporally-controlled by correlation with fossil mammals. This study will complete a biostratigraphic zonation of Puercan and Torrejonian Strata (early and middle Paleocene) in the Crazy Mountains Basin, Montana where the number of molluscan and mammalian localities are particularly numerous. This zonation will be biochronologically correlated with mollusk-and mammal-bearing strata of similar age in the Fort Peck area of Montana, and the Cypress Hills and Big Muddy areas of Saskatchewan. The Puercan, Torrejonian, and early Tiffanian age strata composite section will be temporally overlapped with the richly fossiliferous Tiffanian (upper Paleocene) strata of the Little Missouri River section in southwestern North Dakota. The composite section will provide the first overall nonmarine molluscan biochronology for the Paleocene of North America, and will specifically serve as a reference section for both mollusks and mammals in the northern Great Plains.

非海生软体动物是北美西部古新世陆相地层中最丰富的大型动物化石。然而，它们的生物年代学潜力尚未实现，主要是因为缺乏重点研究确定厚层地层中分类群的生物地层范围，这些地层序列在时间上受与哺乳动物化石的相关性控制。这项研究将完成蒙大拿州疯狂山脉盆地普尔坎和托雷霍期地层(古新世早期和中期)的生物地层分区，那里软体动物和哺乳动物的数量特别多。这一划分将与蒙大拿州佩克堡地区以及萨斯喀彻温省柏树丘陵和大泥地地区类似年龄的软体动物和哺乳动物地层进行生物年代学上的关联。在北达科他州西南部的小密苏里河段，普尔坎、托雷约期和提法世早期地层组合剖面将与富含化石的蒂凡期(上古新世)地层暂时重叠。该复合剖面将提供北美古新世第一个整体非海生软体动物生物年代学，并将专门作为大平原北部软体动物和哺乳动物的参考剖面。