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Coastal & Marine Geology Program > Center for Coastal & Watershed Studies > Professional Paper 1751

Systematic Mapping of Bedrock and Habitats along the Florida Reef Tract—Central Key Largo to Halfmoon Shoal (Gulf of Mexico)

USGS Professional Paper 1751

by Barbara H. Lidz, Christopher D. Reich, and Eugene A. Shinn

Introduction:
Table of Contents
Project Overview
Project Objective
Geologic Setting
Primary Datasets
Primary Products - Overview Maps & Evolution Overview:
Bedrock Surface map.
Introduction
Depth to Pleistocene Bedrock Surface
Reef & Sediment Thickness
Benthic Ecosystems & Environments
Sedimentary Grains in 1989
Summary Illustration Index Map
Evolution Overview
Tile-by-Tile Analysis
Satellite image of the Florida Keys showing location of tiles.
Organization of Report
Tiles: 1, 2, 3, 4,
5, 6, 7/8, 9/10,
11
Summary
Acknowledg-
ments
References
Disclaimer
Related
Publications

Tile 7/8

Terrestrial Sources: Terrestrial stressors include mosquito-control aerosols, residential waste water, marina and canal dredging operations, and storm-water runoff that distribute organic debris, animal wastes, silt, oils, metals, fecal coliform bacteria, pharmaceuticals, viruses, pesticides, nutrients, boat paints, and other contaminants to coastal waters (e.g., Shinn et al., 1994, 1997; Cantillo et al., 2000; Jameson et al., 2002; Porter and Porter, 2002). Shoreline landfills leak contaminants to the groundwater system (e.g., Cantillo et al., 2000). In the keys, onshore cesspits, septic tanks, injection wells, and live-aboard vessels at marinas all supply nutrients, engine fuels, and lubricants to the marine system (LaPointe et al., 1990; Multer, 1993; Shinn et al., 1994).

Human activities can often have unintended impacts on terrestrial processes. For example, expanding tarmac acreage that accompanies urban development prevents water absorption into the ground, thereby increasing surface runoff that carries tarmac chemicals. Tarmac also raises heat absorption, altering local temperatures that heat runoff waters. Structures such as inland dams and levees and shoreline groins disrupt the natural flow of water, which increases rates of erosion and sediment buildup in areas where these processes may otherwise be slow or may not occur at all (e.g., Douglas, 1947; Porter and Porter, 2002).

Coastal & Marine Geology Program > Center for Coastal & Watershed Studies > Professional Paper 1751

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