Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1006/cres.2002.1009 |
Faunal implications of an environmental change before the Cretaceous-Tertiary (K-T) transition in central Utah | |
Difley, R; Ekdale, AA | |
通讯作者 | Difley, R |
来源期刊 | CRETACEOUS RESEARCH
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ISSN | 0195-6671 |
出版年 | 2002 |
卷号 | 23期号:3页码:315-331 |
英文摘要 | The North Horn Formation at North Horn Mountain in central Utah records a shift in the composition of the upper Maastrichtian vertebrate fossil assemblage below the Cretaceous-Tertiary (K-T) boundary. Dinosaurs (Alamosaurus, Tyrannosaurus, Torosaurus, and hadrosaurs), turtles (Basilemys), mammals, and lizards (Polyglyphanodon) occur in the lowest unit of the formation. The environment changed from semi-arid to wetter conditions, and several of the mostly terrestrial vertebrate taxa no longer appeared in the type area. Several taxa that dominated the vertebrate assemblage low in the formation are replaced in the succeeding unit below the K-T boundary by different dinosaur taxa that are represented by eggshells. This altered vertebrate assemblage was more tolerant of, or was adapted to, wetter conditions, but it, too, disappeared at the type locality by the end of the Cretaceous. This wetland dinosaur assemblage is not identical to that found in semi-arid dinosaur assemblages or to dinosaur assemblages in other K-T boundary sites that represent different paleolatitudes. Most of the faunas in the succeeding unit are represented by aquatic forms (crocodilians, turtles, fish, mollusks, and ostracods) which persisted after the dinosaurs disappeared. There appears to be no current tectonic or biostratigraphic reason to conclude that a significant stratigraphic gap exists immediately below the K-T boundary in the North Horn Formation in central Utah. (C) 2002 Elsevier Science Ltd. All rights reserved. |
英文关键词 | Maastrichtian K-T boundary Utah North Horn Formation dinosaur stratigraphy |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000178949000003 |
WOS关键词 | EOCENE ; EVOLUTION |
WOS类目 | Geology ; Paleontology |
WOS研究方向 | Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/142387 |
作者单位 | (1)Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA |
推荐引用方式 GB/T 7714 | Difley, R,Ekdale, AA. Faunal implications of an environmental change before the Cretaceous-Tertiary (K-T) transition in central Utah[J],2002,23(3):315-331. |
APA | Difley, R,&Ekdale, AA.(2002).Faunal implications of an environmental change before the Cretaceous-Tertiary (K-T) transition in central Utah.CRETACEOUS RESEARCH,23(3),315-331. |
MLA | Difley, R,et al."Faunal implications of an environmental change before the Cretaceous-Tertiary (K-T) transition in central Utah".CRETACEOUS RESEARCH 23.3(2002):315-331. |
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