ROA: Stratigraphic Disorder and Taphonomic Processes in a Recent Shallow Marine Environment

ROA：近期浅海环境中的地层紊乱和埋藏过程

• 批准号: 8913442
• 负责人: Judith Parrish
• 金额: $ 10.5万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8913442&HistoricalAwards=false
• 关键词: ROA; Stratigraphic; Disorder; Taphonomic; Processes

Superposition, the presumption that older strata and fossils underlie younger ones, is a basic tenet of stratigraphy and paleontology. At very fine scales of resolution (e.g., centimeters of vertical accumulation), however, mixing by animal burrowing or reworking by physical events (storm surge, current winnowing) may overprint or obscure the original succession. The physical condition of buried shells may or may not be reliable indicators of the extent to which the original stratigraphic sequence is preserved. Radiocarbon dating of shells in a microstratigraphic sequence is another way to ascertain the degree to which the preserved sequence reflects the original vertical succession. Drs. Judith Parrish and Karl Flessa propose an intensive study of several such vertical sequences from the shallow marine environments of the northern Gulf of California. By analyzing the preservation state of shells relative to their vertical sequence and isotopically-determined ages, paleontologists and paleoecologists will gain new insights into the limits of resolution in the fossil record. The results of this study will be cited widely as a yardstick for "calibrating" the reliability of the fossil record, and it will provide a methodological model for future studies.

叠加，假设更古老的地层和化石 是地层学的一个基本原则， 古生物学 在非常精细的分辨率尺度下（例如， 厘米的垂直积累），然而， 物理事件（风暴潮、水流）造成的挖洞或返工 筛选）可能会叠印或掩盖原始的连续性。 的 埋在地下的炮弹的物理状况可能可靠，也可能不可靠 原始地层的变化程度的指标 序列被保存。 贝壳的放射性碳年代测定 微地层序列是确定 保存的序列反映原始序列的程度 垂直演替 Judith Parrish和Karl Flessa博士提出了一个密集的 对几个浅海垂向层序的研究 加州湾北方的环境。 通过分析 贝壳相对于其垂直方向的保存状态 序列和同位素确定的年龄，古生物学家和 古生态学家将获得新的见解， 化石记录中的分辨率。 这项研究的结果将 被广泛引用为“校准”可靠性的标尺 它将提供一个方法论模型 为将来的研究。