Maximum Depositional Age Grid June 2023

This grid is an interpolation of maximum depositional age point data held in the Isotopic Atlas as of June 2023. Data added to the Isotopic Atlas after June 2023 is not represented in this grid. The grid was generated with Esri's ArcMap Spatial Analyst interpolation tool using the Natural Neighbor algorithm and 0.01 degree cell size. Two classifications are provided for this grid; a Jenks natural breaks classification with ten classes (classification 1) as per Champion (2013) http://pid.geoscience.gov.au/dataset/ga/77772, and; the same seven-class interval binning and colour scheme applied to the source point data in the Sedimentary Processes Age Data layer (classification 2).本网格为截至2023年6月收录于同位素图集（Isotopic Atlas）中的最大沉积年龄点位数据的插值结果。2023年6月后新增至该图集的数据未纳入此网格。该网格由Esri的ArcMap空间分析工具采用自然邻域算法（Natural Neighbor algorithm）生成，像元尺寸为0.01度。此网格提供两种分级方案：一是基于Champion（2013）提出的詹克斯自然间断点分级法（Jenks natural breaks classification）的10级分级方案（分级方案1），参考来源为http://pid.geoscience.gov.au/dataset/ga/77772；二是沿用沉积过程年龄数据图层中源点位数据所用的七级区间分箱与配色方案（分级方案2）。