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Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

Subsurface Characterization of Selected Water Bodies in the St Johns River Water Management District, Northeast Florida

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Drayton Island (Lake George)
Putman County, Florida

Introduction | Subsurface Characterization

Introduction

Drayton Island Seismic Track Map.
Seismic Survey Track Map for Drayton Island showing profile locations, survey track lines, and karst features. Click on the image to see a larger version.
The area surveyed near Drayton Island in Lake George occupies southernmost Putnam County. The lake is part of the St. John's River system and the broad valley of the St. John's Offset (see Fig. 8, Regional Geology). The development of this valley is due in part to solution in the underlying limestone, which nears the surface in this area. The lake is bound on either side by the sand hills of the Crescent City Ridge to the east and the Ocala Scrub physiographic region to the west. The flood plain is characterized by swamp vegetation. Four seismic lines, approximately 12 km (7.5 mi), were run around the island. Data quality is typically poor due to noise and ringing in the acoustic return. Possible reasons include accumulation of organics at the river bottom, tightly packed sand in the near-surface and echoes from the nearby shoreline obscuring the signal.

Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

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Updated December 05, 2016 @ 11:25 AM (JSS)