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Terrane and Faunal Studies in Southern Alaska

阿拉斯加南部的地体和动物研究

基本信息

批准号：
9103761
负责人：
Norman Savage
金额：
$ 4.5万
依托单位：
University of Oregon Eugene
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-06-15 至 1993-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103761&HistoricalAwards=false
关键词：
Terrane Faunal Studies Southern Alaska

项目摘要

The Alexander terrane, SE Alaska, has the longest and most complete Paleozoic stratigraphy of the Alaskan terranes, with a stratigraphic and fossil record extending from the early Ordovician to the Permian. Many workers believe it began its long history in the western "Protopacific" and only arrived in the vicinity of North America in late Mesozoic time. Some preliminary faunal evidence indicates that the Alexander terrane has been closely associated throughout its Paleozoic history with the continent of North America or possibly with eastern Siberia. Faunas that have been described include Silurian conodonts and brachiopods, Lower, Middle and Upper Devonian conodonts and brachiopods, Mississippian conodonts, and Pennsylvanian conodonts and brachiopods. The faunas described belong to the Old World Realm and show mainly Cordilleran Region and Canadian Arctic affinities. Although several of the faunas that occur in this fossiliferous sequence have been described, other Emsian, Eifelian, Givetian and Mississippian conodont faunas and silicified Middle Devonian and Mississippian brachiopod faunas have been discovered but remain uncollected and undescribed. Other fossiliferous Pennsylvanian deposits were discovered but not collected in 1988. Continued work on these faunas will provide additional evidence concerning the terrane's origin.

阿拉斯加东南部的亚历山大河拥有最长和最多的阿拉斯加地体完整的古生代地层，其中早奥陶世以来的地层和化石记录到二叠纪许多工人认为它的悠久历史始于西部的“原太平洋”，只到达附近的中生代晚期的北美洲。一些初步的动物群有证据表明亚历山大号在整个古生代历史中，北美或者西伯利亚东部。动物群包括志留纪牙形刺和腕足类，下，密西西比纪中、上泥盆统牙形刺和腕足类牙形刺，宾夕法尼亚牙形刺和腕足动物。动物群所描述的属于旧世界领域和显示主要是科迪勒拉地区和加拿大北极地区。尽管在这片土地上出现的一些动物群其他的埃姆斯期，艾菲尔期，吉韦阶和密西西比阶牙形刺动物群和硅化中层泥盆纪和密西西比纪的腕足动物群但仍然未被收集和描述。其他有害生物 1988年发现了宾夕法尼亚沉积物，但没有收集到。对这些动物群的持续研究将提供更多证据关于《西游记》的起源