United States Lithologic Log Database

Here we presented a detailed hydrogeological characterization of lithologic logs and their respective categorization into 15 broader hydrolithological categories. The paper has been submitted to Nature Communications, and the preprint is available on Earth ArXiv. DOI: https://doi.org/10.31223/X50Q8P This dataset contains 3.7 million wells and 19.2 million lithologic log descriptions, systematically categorized into 15 major hydrolithologic groups. The classification was developed by identifying over 100,000 of the most common lithologic log descriptions and using them to categorize the remaining millions of well log descriptions. This framework provides a consistent basis for groundwater studies, hydrogeologic mapping, and large-scale modeling applications.