2 LONG GEOLOGICAL RECORDS OF CONTINENTAL ECOSYSTEMS
2 LONG GEOLOGICAL RECORDS OF CONTINENTAL ECOSYSTEMS
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DOI：
10.1016/0031-0182(94)00104-g
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发表时间：
1995-05-01
影响因子：
3
通讯作者：
BEHRENSMEYER, AK
中科院分区：
文献类型：
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作者：
BADGLEY, C;BEHRENSMEYER, AK
美国怀俄明州西北部和蒙大拿州中南部的早第三纪陆相层序以及巴基斯坦北方的新近纪西瓦利克层序非常长，含油气丰富，在地质学、古生物学、哺乳动物进化、古生态学和古气候学方面研究得很好。每个记录跨越大约1500万年的冲积沉积在一个前陆盆地。河流系统的大小、洪泛平原的排水和冲积结构随时间的变化各不相同。这两个序列保存了丰富的古土壤，这是一个来源的稳定同位素的古气候信号从土壤碳酸盐。这两个记录的化石收集主要是脊椎动物遗骸，特别是哺乳动物;古近纪序列也保存了丰富的植物遗骸。两个序列之间的脊椎动物保护模式显着不同，把固有的限制古生态重建和哺乳动物谱系的进化研究的范围。在这篇介绍性的论文中，我们总结了这两个长序列在地质背景、年代学和时间分辨率以及哺乳动物区系组成方面的主要异同。最后，我们提出了一个简短的概述文件的组织在这个特殊的问题。
The early Paleogene continental sequence of northwestern Wyoming and south central Montana (USA) and the Neogene Siwalik sequence of northern Pakistan are exceptionally long, fossiliferous, and well studied in terms of geology, paleontology, mammalian evolution, paleoecology, and paleoclimatology. Each record spans about 15 myr of alluvial deposition in a foreland basin. The fluvial systems differed in size, drainage of floodplains, and change in alluvial architecture through time. Both sequences preserved abundant paleosols, which are a source of paleoclimatic signals in stable isotopes from soil carbonates. Fossil collections from both records are dominated by vertebrate remains and especially by mammals; the Paleogene sequence also preserved abundant floral remains. Patterns of vertebrate preservation differed markedly between the two sequences, placing inherent limitations on paleoecological reconstruction and on the scope of evolutionary studies of mammalian lineages. In this introductory paper, we summarize the major similarities and differences in geologic setting, chronology and time resolution, and mammalian faunal composition of these two long sequences. Finally, we present a brief overview of the organization of papers in this special issue.