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William Aley, P.G. and Christine Smith. Inner Shelf Marine Geologic Formations of the South Atlantic Bight: Regulatory Implications and Methods for Project Solutions. Photos courtesy of EPA. Background and Survey Benthic Communities Regional Geology Conclusion. Outline.

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slide1

William Aley, P.G. and Christine Smith

Inner Shelf Marine Geologic Formations of the South Atlantic Bight:Regulatory Implications and Methods for Project Solutions

Photos courtesy of EPA

outline

Background and Survey

  • Benthic Communities
  • Regional Geology
  • Conclusion

Outline

background and survey of fernandina beach odmds

Habitat used by recreational divers and fishermen

  • Record review indicated reconnaissance level only screening performed
  • Today screening procedures more rigorous

Background and Survey of Fernandina Beach ODMDS

benthic communities

Attached organisms:

Sponges

Gorgonians

Tunicates

Hard coral (Oculina varicosa only)

Fish species:

Black Sea Bass

Slippery Dick

Porgy

Cubbyu

Belted Sandfish

Sheepshead

Whitespotted Soapfish

Blue Angelfish

Tomtate

Flounder

Red Snapper

Gag

Benthic Communities

heading2

Side Scan

Mosaic

Close-up

Text

Heading

“potholes”

heading4

ICONS

Seismic Track Lines

NE Florida

Text

Study Area

Heading

slide12

NE Florida Offshore Sedimentary Units

Fernandina

(Study Area)

Cape

Canaveral

St. Augustine

Daytona

slide14

Typical Seismic Profiles

South of Study Area

slide15

Buried Sinkhole

Near Mayport, Fl

heading5

2002 Seismic Survey

Northeastern Florida

USGS/FGS

Text

Heading

Study Area

slide17

Karst Features Observed at Sea Floor

Study Area: Offshore Fernandina, Fl

slide18

Karst Features Observed at Sea Floor

Study Area: Offshore Fernandina, Fl

Text

slide19

Channels Eroded into Shallow Tertiary Sediments

Study Area: Offshore Fernandina, Fl

Text

paleo river channels mapped by fgs

Text

Paleo-River ChannelsMapped by FGS

Nassau Sound

Fernandina, Fl

St. Johns River

Mayport, Fl

heading6

Geologic Conclusions

Text

NE Fl Ledge complexes encountered NOT wave cut platforms /relict shorelines like inner shelf reefs of S Fl.

Seismic profiles provide a unique perspective when characterizing inner shelf marine sediments and benthic environments.

Heading

Sub-bottom sediments of NE Fl characterized by shallow occurrence of lithified, tertiary topographic highs exhibiting several types of karstic dissolution features.

Karstic features may be covered by a thin layer of recent sediments or may be directly exposed.

Relict braided stream channels have been mapped within these units.

applications and future considerations

Applications for disposal area siting, borrow area screening, offshore energy studies, or other similar projects

  • How ephemeral are these features and how does this affect biota?
  • Questions?

Applications and Future Considerations