Alternative Text Description for Environmental Geology

TABLE OF CONTENTS

MAP OVERVIEW

This map displays the environmental geology of Florida, showing the distribution of rock and sediment types located within 10 feet of the land surface. The map categorizes different geological materials across the state, including various types of sand, limestone, dolomite, peat, shell beds, clay, and other sedimentary deposits. This information is valuable for understanding Florida's subsurface composition and has applications in construction, environmental planning, groundwater management, and natural resource assessment.

GEOGRAPHIC CONTEXT

The map covers the entire state of Florida, extending from the Georgia border in the north to the Florida Keys in the south. Major cities labeled on the map include Jacksonville on the northeast coast, Gainesville in north-central Florida, Orlando in central Florida, Tampa on the west coast, Cape Coral in southwest Florida, and Miami in the southeast. The map also shows portions of neighboring areas including southern Georgia (with cities like Dothan, Albany, and Savannah labeled), southern Alabama (with Pensacola visible), and the panhandle region extending to Tallahassee. The map includes both the Atlantic Ocean coastline on the east and the Gulf of America coastline on the west and south.

KEY INSIGHTS

Florida's environmental geology shows distinct regional patterns that reflect the state's geological history and formation processes. Limestone is the dominant surficial geology along much of the coastal areas, particularly forming a continuous band along the Atlantic coast from Jacksonville southward, extending around the southern tip including the Cape Coral and Miami areas, and continuing along portions of the southwest coast. Clayey sand dominates much of the northern interior, the panhandle region, and portions of central Florida, forming the largest contiguous areas in the Tallahassee region and central peninsular areas around Orlando and Tampa. Peat deposits form a prominent concentration in the southernmost portion of the state near Miami and the Everglades region. The geological types show a general pattern of coastal limestone formations surrounding interior areas of sand-based deposits, with transitional zones of mixed materials (limestone/dolomite and shelly sand and clay) between these major regions.

VISUAL ELEMENTS

Environmental Geology

This layer represents the distribution of rock and sediment types within 10 feet of Florida's land surface, categorized into ten distinct geological classifications.

Clayey Sand (bright orange)

Appearance:

Displayed in bright orange color filling irregular polygon areas.

Distribution:

Extensively distributed across northern Florida, the panhandle region, and central peninsular Florida. Major concentrations appear in the Tallahassee area extending eastward, throughout the region north and west of Gainesville, and in substantial portions of central Florida in the Orlando and Tampa vicinity.

Notable locations:

The largest continuous clayey sand area extends across the panhandle from Pensacola through Tallahassee. Another significant concentration occurs in the central peninsula between Gainesville and Orlando, with substantial coverage around the Tampa area.

Spatial patterns:

Clayey sand areas form large, irregular patches primarily in interior portions of the state, generally occurring away from immediate coastal zones. These deposits often occupy upland areas and interior highlands.

Limestone (bright green)

Appearance:

Displayed in bright green color filling irregular polygon areas.

Distribution:

Extensively distributed along coastal regions, forming the dominant geology of Florida's Atlantic coastline from Jacksonville southward, the southern tip of the peninsula, portions of the southwest coast, and scattered areas in north-central Florida near Gainesville.

Notable locations:

Forms a nearly continuous band along the entire Atlantic coast from Jacksonville to Miami, encompasses the Cape Coral region on the southwest coast, and creates substantial coverage in the southern peninsula and Florida Keys area. Notable inland occurrences appear in the Gainesville area.

Spatial patterns:

Limestone predominantly forms linear to curvilinear bands following coastal areas, with the most extensive continuous coverage along the eastern seaboard. The distribution suggests marine depositional environments and reflects Florida's geological history as a carbonate platform.

Peat (dark brown)

Appearance:

Displayed in dark brown color filling irregular polygon areas.

Distribution:

Concentrated primarily in the southernmost portion of peninsular Florida in the Everglades region near Miami, with smaller isolated patches in the Melbourne-Palm Bay area on the east coast and very limited occurrences elsewhere.

Notable locations:

The most substantial peat deposit forms a large, prominent area in the southern peninsula south of Lake Okeechobee and west of Miami, corresponding to the Everglades wetland system.

Spatial patterns:

Peat deposits are highly localized and associated with low-lying wetland areas, particularly the Everglades. The concentration in south Florida reflects organic accumulation in freshwater marsh environments.

Limestone/Dolomite (olive/tan-green)

Appearance:

Displayed in olive or tan-green color filling irregular polygon areas.

Distribution:

Occurs as transitional zones and scattered patches, most notably in a band through the central peninsula near Gainesville extending toward the Tallahassee area, and in limited areas of the northern peninsula.

Notable locations:

A distinct concentration appears in the Gainesville region, forming a transition zone between the limestone-dominated areas to the east and south and the clayey sand areas to the north and west.

Spatial patterns:

These mixed carbonate deposits often occur as transition zones between pure limestone areas and siliciclastic (sand and clay) dominated regions, suggesting areas of mixed sedimentary input or diagenetic alteration.

Shelly Sand and Clay (light green)

Appearance:

Displayed in light green color filling irregular polygon areas.

Distribution:

Distributed in scattered patches throughout Florida, with concentrations along portions of the Atlantic coast, in the Tampa Bay area, and in southwest Florida near Cape Coral and southward.

Notable locations:

Notable occurrences appear as irregular patches along the central Atlantic coast, throughout the greater Tampa Bay region, and in the southwest coastal areas extending from Cape Coral southward along the coast.

Spatial patterns:

This category often occurs in coastal or near-coastal settings and in transitional zones between pure limestone and sandy areas, suggesting mixed depositional environments with both carbonate (shells) and siliciclastic (sand and clay) components.

Shell Beds (pale yellow/cream)

Appearance:

Displayed in pale yellow or cream color filling irregular polygon areas.

Distribution:

Occurs in limited, scattered patches primarily in interior portions of central Florida in the Orlando area and in portions of the Tampa region.

Notable locations:

Small, isolated occurrences appear around Orlando and in scattered locations in the central peninsula.

Spatial patterns:

Shell beds are relatively rare and localized, occurring as small patches that suggest ancient shoreline or shallow marine depositional environments now located inland due to sea level changes.

Gravel and Coarse Sand (light gray)

Appearance:

Displayed in light gray color filling irregular polygon areas.

Distribution:

Very limited distribution, with small scattered occurrences primarily in northern and northwestern Florida and extremely limited presence elsewhere.

Notable locations:

The most notable occurrences appear as small patches in the panhandle and northern regions of the state.

Spatial patterns:

This coarsest sediment category is rare in Florida's surficial geology, occurring only in small, isolated patches primarily in northern areas where higher energy depositional environments may have existed.

Dolomite (cyan/turquoise)

Appearance:

Displayed in cyan or turquoise color filling irregular polygon areas.

Distribution:

Extremely limited distribution with only a few very small isolated patches visible on the map.

Notable locations:

Rare and difficult to identify as distinct areas at this map scale.

Spatial patterns:

Pure dolomite is exceedingly rare as a surficial material in Florida, occurring only in very limited, isolated locations.

Med. Fine Sand and Silt (gray)

Appearance:

Displayed in gray color filling irregular polygon areas.

Distribution:

Scattered in small patches throughout various portions of the state, with no dominant regional concentration readily apparent at this scale.

Notable locations:

Individual occurrences are small and dispersed across the state.

Spatial patterns:

This medium to fine-grained sediment type occurs sporadically and does not form large continuous areas, suggesting localized depositional conditions.

Water (light blue)

Appearance:

Displayed in light blue color filling polygon areas.

Distribution:

Appears as a few small isolated patches, most notably in the south-central portion of the peninsula.

Notable locations:

The most prominent water feature appears as a light blue area in the interior of the southern peninsula, likely representing Lake Okeechobee or similar large water body.

Spatial patterns:

Water bodies are included in this geological classification where they represent permanent surface water features within the mapped area.

Overlapping Patterns

The map reveals clear transitional zones where different geological materials interface. The limestone/dolomite category often appears as a transition between pure limestone coastal areas and interior clayey sand regions, particularly evident in the Gainesville area. Shelly sand and clay frequently occurs at boundaries between limestone-dominated coastal zones and sand-dominated interior zones, representing mixed sedimentary environments. The spatial arrangement suggests a general pattern of carbonate-dominated coastal and southern areas transitioning to siliciclastic-dominated interior and northern areas, reflecting Florida's geological evolution from a marine carbonate platform to its current configuration.

SYMBOL GUIDE

ADDITIONAL INFORMATION

This map represents shallow subsurface geology within 10 feet of the land surface, which is particularly important for engineering, construction, septic system placement, and environmental management decisions. The geological materials shown reflect Florida's formation as a carbonate platform that has been repeatedly submerged and exposed throughout geological history, with more recent siliciclastic sediment deposition in northern and interior areas. The distribution of these materials influences groundwater flow, aquifer characteristics, soil development, natural vegetation patterns, and land use suitability. Areas with limestone at or near the surface are often associated with karst features such as sinkholes and springs. Peat areas in southern Florida represent the Everglades and other wetland systems where organic matter accumulation has occurred. The map provides a generalized view of surficial geology, and local variations may exist at finer scales than shown.

DATA CONTEXT

Data Source:

The data is sourced from the Florida Department of Environmental Protection (FDEP). The dataset represents the geological materials found within the uppermost 10 feet of the land surface across Florida, compiled from geological surveys, soil data, and subsurface investigations. Data source layer name: GEONAD_1983_HARN_Florida_GDL_Albers.

Definition Query:

No definition query or filter criteria was applied. The map displays the complete dataset showing all ten geological categories across the entire state.

Scale Information:

The map is displayed at a statewide scale appropriate for regional planning and general geological characterization. This scale is suitable for understanding broad regional patterns of surficial geology but may not capture local variations or small isolated deposits. Site-specific investigations would be necessary for detailed project planning.

Coordinate System:

The map uses the NAD 1983 HARN Florida GDL Albers projection (WKID 3087), an equal-area projection appropriate for statewide mapping in Florida that minimizes distortion of area measurements.

Time Period of Content:

Information about the specific time period of data collection is not provided in the available metadata.

Limitations:

The map represents generalized geological conditions within 10 feet of land surface and may not reflect localized variations, human alterations, or deeper subsurface conditions. Boundaries between geological units are approximate and may transition gradually rather than at sharp boundaries shown on the map. Urban development, mining, and other land modifications may have altered surficial materials in some areas since data collection. The map does not show the thickness or depth variation of materials within the 10-foot depth range.

Map Coverage:

The map covers the entire state of Florida from the Georgia and Alabama borders in the north to the Florida Keys in the south. Portions of southern Georgia and southern Alabama are visible for geographic context but are not the focus of the geological data display. The map includes both the Atlantic Ocean coastline and the Gulf of America coastline.

The alternative text description of this map was AI-generated and may contain inaccuracies.