Paleontological Study of Hemphillian (Late Miocene to Early Pliocene) Vertebrate Localities in Central Mexico

墨西哥中部半新世（中新世晚期至上新世早期）脊椎动物地区的古生物学研究

• 批准号: 8620155
• 负责人: Wade Miller
• 金额: $ 2.72万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1990-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8620155&HistoricalAwards=false
• 关键词: Paleontological; Study; Hemphillian; Late; Miocene

Known late Hemphillian (Early Pliocene) terrestrial vertebrate sites are rare in Mexico, and apparently, unequivocal early Hemphillian fossils (Late Miocene) have not yet been reported from anywhere in the country (fossils of these ages are extremely rare in all Central America). Outside the area of the presently proposed study only three localities of late Hemphillian age have been reported: Tehuichila in the state of Hidalgo; La Goleta in the state of Michoacan (which probably contains more Blancan than Hemphillian age fossils); and Yepomera in the northern state of Chihuahua. The first two sites have not been well documented stratigraphically, although the third, and most productive site, has. It is, however, only about 150 miles south of the U.S.-Mexican border. Inside the presently proposed study area, which lies within the east- central part of the state of Guanajuato in central Mexico, are two reported Hemphillian vertebrate sites. One, El Ocote, has been discussed in several reports; the other, Coecillo, has not been well collected or studied. A third, Rinconada, is newly discovered. The last site contains very abundant, well preserved fossils which appear to represent early as well as late Hemphillian forms. Knowledge of early Hemphillian vertebrates from Central America would be important for several reasons. These include a better understanding of the earliest times of dispersals in the Late Cenozoic between North and South America, determination whether dispersals were episodic rather than continual, comparison of relatively poorly known Hemphillian faunas in Central America with well known ones in the United States, and valuable information concerning the origin and diversification of a number of mammalian genera and species which appeared suddenly in the United States' Great Plains area that probably evolved on the Mexican Plateau. These genera and species include such important groups as horses and cricetid rodents. Additionally, data gathered during the proposed research would provide valuable information on changing climatic and ecologic conditions during an important time interval. The major objective of this proposed research is to carefully collect fossils and data in a stratigraphic context at the Rinconada and Coecillo sites. Screen washing for fossils would be part of the operation. Fossils would then be prepared and studied in order to obtain knowledge relevant to the items stated above.

已知的晚期Hemphillian（上新世早期）陆地 脊椎动物的遗址在墨西哥很少见，显然， 早期Hemphillian化石（晚中新世）尚未被 来自全国各地的报告（这些年龄的化石 在整个中美洲极其罕见）。 禁区外 在目前提出的研究中，最近只有三个地方 Hemphillian年龄已被报道：Tehuichila州 伊达尔戈;米霍坎州的拉戈莱塔（可能 包含更多的Blancan比Hemphillian年龄化石）; 北方奇瓦瓦州的耶波梅拉。 前两 这些地点在地层学上没有很好的记录，尽管 第三个，也是最具生产力的网站，已经。 然而，只有 在美国以南150英里处墨西哥边境 内 目前，研究区位于东部， 位于墨西哥中部的瓜纳华托州中部， 报告了两个血友病脊椎动物遗址。 其中一个，埃尔奥科特， 在几份报告中讨论过;另一个，Coecillo，没有 被很好地收集或研究。 第三个，Rinconada，是新的 发现了 最后一个网站包含了非常丰富的， 保存下来的化石似乎代表了 晚期Hemphillian型 对华中地区早期Hemphillian脊椎动物的认识 美国之所以重要，有几个原因。 这些包括 更好地了解最早的传播时间， 南北美洲晚新生代，厘定 扩散是否是间歇性的而不是持续性的， 比较中相对鲜为人知的Hemphillian动物群 中美洲与美国的知名企业，以及 关于原产地和多样化的宝贵信息 许多哺乳动物的属和种 突然在美国大平原地区， 是在墨西哥高原上进化的 这些属和种 包括马和仓鼠等重要动物。 此外，在拟议的研究期间收集的数据将 提供有关气候和生态变化的宝贵信息， 在一个重要的时间间隔。 这项研究的主要目的是 仔细收集化石和地层资料 在林科纳达和科西略遗址 洗网机 化石也是手术的一部分 化石将成为 准备和研究，以获得相关知识， 上述项目。