Collaborative Research: Integrated Field and Laboratory Studies of Foraminiferal Taphonomy in Quaternary Carbonate and Siliclastic Depositional Environments

第四纪有孔虫埋藏蚀变 加州湾北方的硅质矿床将 通过实地和实验室试验抗性研究进行量化 磨损、溶解、生物侵蚀和运输。 收盘 全新世和更新世沉积物的并列将允许 评价从发展中国家向发展中国家转变所涉及的进程， 近地表沉积物中的活有孔虫生物群 组合到保存的化石组合。 的好处 这种方法包括：1）测试识别 在组合中占主导地位的形态型， 特别是环境制度。 2)可重复性试验 埋藏学特征 3)当与数据结合时， 活物种的相对丰度和试验生产率， 确定人口的相对贡献 沉积物形成的动力学和埋藏学过程 集会 4)测试特性的确定， 赋予对破坏的抵抗力， 的影响，并应导致更好地了解 形态学对栖息环境的限制。 上述信息将与获得的信息相结合。 以前来自牙买加的全新世碳酸盐环境， 导致广泛覆盖的出露相的发育 微体化石组合的模式。 由于这些模型是基于 测试形态型，而不是特定的物种，他们应该是 适用于多种环境和时间间隔。

Taphonomic alteration of foraminifera from Quaternary siliciclastic deposits in the northern Gulf of California will be quantified through field and laboratory studies of test resistance to abrasion, dissolution, bioerosion, and transport. The close juxtaposition of Holocene and Pleistocene deposits will allow the evaluation of those processes involved in the transformation from living foraminiferal biotas through near-surface sediment assemblages to preserved fossil assemblages. The benefits from such an approach include: 1) The identification of test morphotypes which predominate within assemblages accumulating under particular environmental regimes. 2) Testing of the preservability of taphonomic signatures. 3) When combined with data on the relative abundances of living species and test production rates, the determination of the relative contributions of population dynamics and taphonomic processes to the formation of sediment assemblages. 4)The determination of test characteristics which confer resistance to destruction has important evolutionary implications and should lead to the better understanding of the morphological constraints on inhabiting particular environments. The above information will be integrated with that obtained previously from Holocene carbonate environments at Jamaica, resulting in the development of broadly encompassing taphofacies models for microfossil assemblages. As these models are based upon test morphotypes, rather than particular species, they should be applicable to numerous environments and time intervals.