Lithostratigraphy, Geophysics, Biostratigraphy, and Strontium-Isotope Stratigraphy of the Surficial Aquifer System of Eastern Collier County and Northern Monroe County, Florida

5 Introduction 5 Acknowledgments 8 Previous Studies 8 Geology 8 Hydrostratigraphy and Hydrology 8 Setting 10 Study Area 10 Stratigraphic Framework 10 Arcadia (?) Formation 10 Peace River Formation 10 Unnamed formation 12 Tamiami Formation 13 Fort Thompson (?) Formation 13 Miami Limestone 13 Methods 13 Coring Operations 13 Casing Configuration of Coreholes 14 Drilling-Mud Removal from Coreholes 14 Geophysical Logging 15 Natural gamma-ray log 15 Induction conductivity log 15 Neutron porosity log 16 Fluid column resistivity log 16 Fluid temperature log 16 Heat-pulse flowmeter 16 Sediment Analysis 17 Dinocyst Analysis 17 Strontium-Isotope Analysis of Shells Recovered from Cores 17 Geophysical Results 48 Geophysical Logs 48 Formation Conductivity Analysis 48 Flowmeter Profile Analysis 50 Stratigraphic Results 55 Golightly Core 55 Lithostratigraphy 55 Biostratigraphy 55 Strontium-isotope stratigraphy 55 Age summary 59 Trail Center Core 59 Lithostratigraphy 59 Biostratigraphy 59 Strontium-isotope stratigraphy 60 Age summary 60 Dade-Collier Airport Core 60 Lithostratigraphy 60 Biostratigraphy 61 Strontium-isotope stratigraphy 61 Age summary 61 FAA Radar Core 61 Lithostratigraphy 61