This dataset contains well log observations compiled by the University of Massachusetts, and published as a Web feature service for the National Geothermal Data System. Fields in the Well Log Observation Content Model will become XML elements in interchange documents for WMS simple features provided by a node in the USGIN network. Each observation includes a Log URI, API Number, Latitude and Longitude spatially referenced to EPSG: 4326 (for interoperability). The data contained in the submitted dataset is available as an Excel Spreadsheet, ESRI service, WMS and WFS service. Link to Well Log Observation Content Model: http://stategeothermaldata.org/data_delivery/content_models/well_log_observation.