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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 5

Tile 5 Coordinates:
24°39'19.51" N. 81°25'53.42" W.
24°43'20.71" N. 81°10'11.27" W.
24°36'19.52" N. 81°07'59.14" W.
24°32'15.45" N. 81°23'47.41" W.
Major Geographic Sites: Tile 5 includes Moser Channel, Bahia Honda Key, Bahia Honda Channel, and Newfound Harbor Keys (middle Keys), and the southernmost parts of Ramrod, Torch, and Big Pine Keys (lower Keys) (Fig. 77A, 77B, 77C). Newfound Harbor Keys are the westernmost of the middle Keys. Offshore features include Big Pine Shoal and prominent coral-rock ridges, specifically those just inshore of Marker G.

The FKNMS has designated an area just south of the westernmost island of the Newfound Harbor Keys as a Research Only Area (see Marine Sanctuaries). The area is one of patch reefs on the outer part of the nearshore rock ledge.

Figure 77. (A) Landsat satellite image of south Florida shows individual tile boundaries (blue rectangles) of this regional study in the Florida Keys National Marine Sanctuary. Tile 5 is highlighted. (B) Index map shows locations of named reefs and shoals in the upper Keys and northeastern middle Keys, delineated by dashed lines. Most named reefs and shoals were once historic islands. Red rectangles show geographic boundaries of Tiles 1, 2, 3, and 4. (C) Contiguous part of index map shows westernmost part of middle Keys and the lower Keys, delineated by dashed lines. Note the difference in island orientation. The upper and middle Keys are composed of the Pleistocene Key Largo Limestone coral reef. The lower Keys consist of oolitic tidal bars of the same age known as the Miami Limestone. Both rock formations accumulated during a stand of sea level at ~125 ka that was higher, perhaps by 10.7 m, than sea level is today. Red numbered rectangle denotes geographic boundaries of Tile 5 with its geographic sites highlighted. Sanctuary boundary is in red; shelf-margin contour is in blue. Contours are in meters. [larger version]
Landsat satellite image of south Florida shows individual tile boundaries (blue rectangles) of this regional study in the Florida Keys National Marine Sanctuary. Tile 5 is highlighted.
Index map shows locations of named reefs and shoals in the upper Keys and northeastern middle Keys
Contiguous part of index map shows westernmost part of middle Keys and the lower Keys. Red numbered rectangle denotes area of Tile 5. Contours are in meters.

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

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