Preliminary integrated geologic map data for Alaska

A GIS database of geologic units and structural features in Alaska, with lithology, age, data structure, and format written and arranged just like the other states.阿拉斯加州地质单元与构造特征地理信息系统（Geographic Information System, GIS）数据库，其岩性、地质年代、数据结构及格式的编写与编排规范，均与美国其他各州保持一致。