Description: What is a Subsidence Incident? Sinkholes are closed depressions in areas underlain by soluble rock such as limestone, dolostone, gypsum, or salt. Sinkholes form when surface sediments subside into underground voids created by the dissolving action of groundwater in the underlying bedrock. Other subterranean events can cause holes, depressions or subsidence of the land surface that may mimic sinkhole activity. These include subsurface expansive clay or organic layers which compress as water is removed, collapsed or broken sewer and drain pipes or broken septic tanks, improperly compacted soil after excavation work, and even buried trash, logs and other debris. Commonly, a reported depression is not verified by a licensed professional geologist to be a true sinkhole, and the cause of subsidence is not known. Such an event is called a subsidence incident. The Florida Geological Survey maintains and provides a downloadable database of reported subsidence incidents statewide. While this data may include some true sinkholes, the majority of the incidents have not been field-checked and the cause of subsidence is not verified.
Description: This dataset represents swallets (stream to sink features) discovered, researched and mapped by the Florida Department of Environmental Protection, Florida Geological Survey, Florida Swallet Survey. The Florida Swallet Survey was a mapping program funded by the Florida Department of Environmental Protection's Florida Springs Initiative. A swallet is a stream to sink feature, meaning there is a contribution area that concentrates runoff into identifiable streams that disappear underground at a specific point through a sinkhole. The streams may be either intermittent or continuously flowing. Data collected includes: GPS points from a Trimble ProXR and TSC-1 Data Logger; length and width of pools and basins using a range finder; pool depths, if possible, using a hand-held sonar depth finder; color, clarity and visibility of the water in the pool using a secchi disk; photos were taken and written assessments were made of the geology, topography, vegetation, and notations of anything within a 150-meter radius. This dataset represents swallet locations that were within the scope of the Florida Springs Initiative / Florida Swallet Survey project. As such, not all Florida swallets are included in this dataset, and it is by no means comprehensive.
Description: This dataset contains karst features derived from 1996 DEM. Karst is a type of topography that results from dissolution and collapse of carbonate rocks such as limestone and dolomite and characterized by closed depressions or sinkholes, caves, and underground drainage.
Description: This dataset contains Sensitive Karst Areas found within the Southwest Florida Water Management District. This is a subset of the data layer found on the map titled "Geologic Map of the State of Florida", created by the Department of Environmental Protection . This data layer is a reselection of the formation types that were determined to be "Sensitive Karst Areas". Karst is a terrain with distinctive landforms and hydrology created from the dissolution of soluble rocks, principally limestone and dolomite. Karst terrain is characterized by springs, caves, sinkholes, and a unique hydrogeology that results in aquifers that are highly productive but extremely vulnerable to contamination.
Description: This dataset represents distribution of the following rock and sediment types located within 10 feet of land surface: Clayey Sand, Dolomite, Gravel and Coarse Sand, Limestone, Limestone/Dolomite, Med. Fine Sand and Silt, Peat, Sandy Clay and Clay, Shell Beds, Shelly Sand and Clay.
Description: This report presents the results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here.
Value: HAWTHORN GROUP, PEACE RIVER FORMATION, BONE VALLEY MEMBER Label: Hawthorn Group, Peace River Formation, Bone Valley Member Description: N/A Symbol: