Collaborative Research: An Astronomical-Calibrated Time Scale for the Mesozoic Era

这个合作项目将从地层数据中记录的轨道强迫古气候周期中收集中生代（6500万至2.51亿年前）的连续天文时间尺度（ATS）。这些结果将至少在一个数量级上改进对地球系统大范围过程的速率和时间的估计。项目活动将与十多个国际合作伙伴协调，并将利用国际地层学委员会白垩纪、侏罗纪和三叠纪小组委员会的专业知识。这个宏大的“团队”的目标是将现在几乎完成的新生代（0 - 6500万年前）的ATS扩展到过去的2.5亿年。支持新生代ATS的方法将适用于中生代。重点将放在地层信号与天文模型的拟合、不同地区记录的重复、地磁极性特征的高分辨率校准和综合生物化学地层学等方面。为了帮助科学，将创建一个普遍可访问的信号处理工具箱，以使旋回地层学研究以及许多其他地球科学领域使用的领先统计时间序列技术现代化并统一起来。重建的ATS的数值年龄将与NSF的EARTHTIME项目联合使用的其他测年技术进行相互校准。所有数据和工具都将通过多个NSF公共数据库系统进行记录和访问，包括GEON、CHRONOS、palestrat、PBDB等。该项目实现了一项正在进行的全球社区倡议，即为过去2.5亿年的地球历史开发一个连续的、天文校准的国际地质时间尺度。

This collaborative project will assemble a continuous Astronomical Time Scale (ATS) for the Mesozoic Era (65 to 251 million years ago) from orbitally forced paleoclimate cycles recorded in stratigraphic data. The results should improve estimates of rates and timings of a wide range of Earth system processes by at least an order of magnitude. Project activities will be coordinated with more than a dozen international partners and will utilize the expertise of the Cretaceous, Jurassic, and Triassic subcommissions of the International Commission on Stratigraphy. The grand "team" goal is to extend the ATS, now virtually complete for the Cenozoic Era (0 to 65 million years ago), to encompass the past 250 million years. The methods that underpin the Cenozoic ATS will be applied to the Mesozoic. Emphasis will be placed on the goodness of fit of stratigraphic signals to astronomical models, duplication of records from different regions, and high-resolution calibration to geomagnetic polarity signatures and integrated bio- and chemostratigraphy. To aid in the science, a universally accessible signal processing toolbox will be created to modernize and unite leading statistical time series techniques used in cyclostratigraphic research, as well as in many other geoscience fields. Numerical ages from the reconstructed ATS will be inter-calibrated with other dating techniques in conjunction with NSF's EARTHTIME Project. All data and tools will be documented and accessible through multiple NSF public database systems, including GEON, CHRONOS, PaleoStrat, PBDB, and others. This project fulfills an ongoing global community initiative to develop a continuous, astronomical-calibrated, International Geologic Time Scale for the past quarter billion years of Earth history.