EAGER: AMS Dating, Rapid Prototyping and Student Intern for the Tarkio Valley Giant Ground sloth Locality

AMS测年，快速成型和塔基奥山谷的学生实习生巨型地懒地方性福尔摩斯·A·塞姆肯，爱荷华州大学摘要。一个非同寻常的发现--一只相对完整的冰河时代的成年巨型地懒(Megalonix Jeffersonii)与来自爱荷华州西南部塔基奥山谷的两只幼崽有关--现在已经完成。最近在塔尔基奥地区下游的砾石坝上发现了一只哈兰？S(Parylodon Harlani)地懒(Parylodon Harlani)掌骨，这为该项目增添了一个新的维度：在非常接近的地层中，有两种完全不同的地懒形式。PI请求资金对这两种截然不同的地懒物种(和属)进行AMS C14测年，以验证它们彼此之间的年龄。确定这两个不同属的更新世地懒的年龄对于了解它们的古生物学和古生态是至关重要的。AMS C14日期是高风险吗？高回报活动，因为它不确定它在长骨髓腔材料中的应用是否成功；如果成功，新的方法将是这种方法的变革性。爱荷华大学的上新世研究项目从其面向普通公众、本科生和研究生的角度来看是非同寻常的，并将继续作为这一热切提议的组成部分。

AMS Dating, Rapid Prototyping and Student Intern for the Tarkio ValleyGiant Ground sloth LocalityHolmes A. Semken, University of IowaAbstract. Excavation of an extraordinary find, a relatively complete adult ice-age giant ground sloth (Megalonyx jeffersonii) associated with two juveniles from the Tarkio Valley in southwest Iowa, is now complete. The recent discovery of a Harlan?s ground sloth (Paramylodon harlani) metacarpal on a gravel bar immediately downstream from the Tarkio locality added a new dimension to the project: there are two entirely different forms of ground sloth in close stratigraphic proximity of one another. The PI requests funds to undertake an AMS C14 dating of these two distinctly different species (and genera) of ground sloth to verify their ages relative to one another. Determining the ages of these two different genera of Pleistocene ground sloths is crucial for understanding their paleobiology and paleoecology. The AMS C14 date is a high risk ? high reward activity in that it is uncertain that its application to long bone medullary cavity materials will be successful; if successful, the new methodology will be transformative for this method. The University of Iowa Plesitocene research program is extraordinary from the standpoint of its outreach to the lay public, undergraduate and graduate students and will continue as a component of this EAGER proposal.