Problem of codes of geological ages in the process of establishment of the geological map database

In the process of establishment of the 1∶500000 national geological map database, the authors revised the codes of geologic ages in the original national standards for geological age codes in accordance with the requirements for application so as these codes to be applicable to arbitrary retrieval and statistics according to geologic ages, merging of various area elements according to different requirements and automatic formation of required painted colors, patterns and geological symbols according to the age codes. The applications over the past ten years have proved that the results are good. According to the application abroad, the authors propose that thecodes of geologic ages will be revised with geologic real ages.