Geological age mean (M years)

Mean geological age (millions of years before present) derived from the 1:1 million surface geology of Australia (Raymond 2009) by combining the descriptive geological age fields with the timescales database (Laurie et al. 2008) to assign numerical ages to each map unit. The mean age values represent the average of the age values in four fields (MIN_TOPAGE, MAX_TOPAGE, MIN_BOTAGE, MAX_BOTAGE). Rock voids without data including lakes were filled by neighbourhood statistics.

本数据集的平均地质年龄（单位：百万年前）基于雷蒙德2009年发布的1:100万比例尺澳大利亚地表地质图，通过将描述性地质年龄字段与劳里等人2008年的年代尺数据库相结合，为每个地质图斑赋予数值化年龄。平均年龄值为MIN_TOPAGE、MAX_TOPAGE、MIN_BOTAGE、MAX_BOTAGE四个字段的年龄值的算术平均值。包括湖泊在内的无数据岩石空白区域，通过邻域统计方法完成填充补全。