The Florida Geological Survey (FGS) maintains a collection of geophysical logs run on water production wells, monitor wells, injection wells, oil and gas wells, and stratigraphic testing boreholes throughout the state. The collection represents approximately 5,320 boreholes, some of which are also represented in the core and well cuttings sample collection. The collection includes the following log types: Spontaneous Potential (SP), Single Point Resistance (SPR), Time, Caliper, Fluid Conductivity, Magnetic, Electrical Induction, Natural Gamma, Dipmeter, Laterolog, Micro Laterolog, Neutron, Photo, Radioactivity, Sonic, Temperature, Gamma-Gamma, Resistivity, and Fluid Velocity. The collection contains logs run by multiple agencies including the FGS, the U.S. Geological Survey, and the water management districts of Florida. The remaining 10% were run by various private drilling and geophysical logging companies. The physical collection is currently stored in four file cabinets, organized by county. These paper logs are long, continuous, accordion sheets. Many of the logs are printed on delicate onion skin paper or fading thermal paper. Through NGGDPP grant-funded projects, the historic collection was scanned and is now available in an electronic format through the FGS website. The oldest log in the collection is from 1932.
