Late Cenozoic Vertebrate Biostratigraphy Across the TransMexican Volcanic Belt, Central Mexico

Miller-Jiang 9902898墨西哥火山带基本上是东西走向，横跨墨西哥中部，包含一系列南北走向的晚新生代地堑。 这些断陷盆地含有丰富的脊椎动物化石记录，直到最近才被承认其范围。 基于初步研究，这一记录的明显完整性表明，很有希望能够建立一个完整的从中新世早期到更新世的脊椎动物进化系列。 气候和环境变化的主要范围，南美移民的到来时间，以及原因，许多形式的移民是本研究将解决的主题。 沉积物的类型，其中包括丰富的火山灰和火山岩的边界和盆地之下，允许上述事件的时间精度。

Miller-EAR 9902898The Transmexican Volcanic Belt, which runs basically east-west across central Mexico, contains a series of north-south trending late Cenozoic grabens. These faulted basins contain a rich vertebrate fossil record that has only recently been recognized as to its extent. The apparent completeness of this record, based on preliminary research, shows great promise in being able to establish an unbroken evolutionary series of vertebrates from the early Miocene through the Pleistocene. Climatic and environmental changes of major scope, times of arrivals of South American immigrants, as well as reasons for extinctions of many forms are topics that will be addressed in the present research. Types of sediments, which include abundant volcanic ash and volcanic rocks bordering and underlying the basins, allow for great chronologic precision of the above events.