U. S. GEOLOGICAL SURVEY OPEN FILE REPORT 99-506 West Central Florida Coastal Studies Project Coastal Transect #2: Caladesi Island - Clearwater Beach Island, FL By S. D. Locker(1), R. A. Davis(2), G. R. Brooks(3), A. C. Hine(1) and G. Gelfenbaum(4) (1) College of Marine Science University of South Florida St. Petersburg, FL 33701 (2) Department of Geology University of South Florida Tampa, FL 33620 (3) Department of Marine Science Eckerd College St. Petersburg, FL 33711 (4) U. S. Geological Survey Center for Coastal and Regional Marine Studies 600 Fourth Street South St. Petersburg, FL 33701 U. S. DEPARTMENT OF THE INTERIOR Gale A. Norton, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director For sale by the U. S. Geological Survey Information Services Box 25286, Federal Center Denver, CO 80255 TABLE OF CONTENTS Disclaimer System Requirements Project Summary CD Organization Getting Started Contacts Credits and Acknowledgements References DISCLAIMER This Compact Disc (CD) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any employee makes any warranty expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any nformation, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States or any agency thereof. Although all data and software published on this CD have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials. This report (map) is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). SYSTEM REQUIREMENTS This CD-ROM was produced in accordance with the ISO 9660 and the HFS standards and can be accessed by any computer system that has the appropriate software to read ISO 9660 and HFS discs. The discs are intended for use with Windows, Macintosh and UNIX systems. The image data can be accessed directly from the CD-ROM using a web browser. PROJECT SUMMARY A major goal of the West-Central Florida Coastal Studies Project was to investigate linkages between the barrier-island system along the west coast of Florida and offshore sedimentary sequences. High population density along this coastline and the resultant coastal-management concerns were primary factors driving the approach of this regional study. Key objectives were to better understand sedimentary processes and sediment accumulation patterns of the modern coastal system, the history of coastal evolution during sea-level rise, and resource assessment for future planning. A series of nine "swath" transects, extending from the mainland out to a depth of 26 m, was defined to serve as a focus to merge the data sets and for comparison of different coastal settings within the study area. Transect #2 extends seaward from Caladesi Island and North Clearwater Beach. Information from seismic and vibracore studies is combined to derive a 2-D stratigraphic cross section extending from the offshore zone, through the barrier island, and onto the mainland. This stratigraphic record represents the late Holocene evolution of the coastal-barrier system and inner shelf following the last sea-level transgression and present highstand conditions. A comparison to surface-sediment distribution patterns indicated by side-scan sonar imagery and bottom grab samples illustrates the importance of spatial variability in sediment-distribution patterns offshore when considering stratigraphic interpretations of seismic and core data. CD ORGANIZATION The files on the CDs are organized by directory. The root or main directory contains all the necessary HTML and image files to run the web pages. PDF image files for viewing or printing the poster and JPEG and TIFF files for smaller and lower resolution formats are located in the "poster" sub-directory. The 'images' directory contains individual images of each section of the poster. The 'frames' directory contains the html files that make the frames appear in a web browser. GETTING STARTED Insert the CD-ROM into a computer and access the index.html file in the root directory either by opening it through a web browser or by double clicking on the icon. CONTACTS S. D. Locker College of Marine Science University of South Florida St. Petersburg, FL 33701 R. A. Davis Department of Geology University of South Florida Tampa, FL 33620 G. R. Brooks Department of Marine Science Eckerd College St. Petersburg, FL 33711 A. C. Hine College of Marine Science University of South Florida St. Petersburg, FL 33701 G. Gelfenbaum U. S. Geological Survey Center for Coastal and Regional Marine Studies St. Petersburg, FL 33701 CREDITS AND ACKNOWLEDGEMENTS The large field program and combination of data sets brought to this compilation are the result of significant efforts by many people. Beau Suthard helped compile, process, and display much of the imagery presented. Significant contributions were made by Nancy DeWitt and Kristin Yale. We thank the following people for help in the field or laboratory; Patrick Barnard, Greg Berman, Norm Blake, Jim Edwards, Brian Donahue, Larry Doyle, Dave Duncan, John Cargill, Tom Ferguson, Megan Fitzgerald, Mark Hafen, Jackie Hand, Scott Harrison, Tessa Hill, Bret Jarrett, Jennifer Kling, Katie Kowalski, David Mallinson, John Nash, Steve Obrochta, Meg Palmsten, John Pekala, Boudewijn Remick, Peter Sedgwick, Brad Silverman, Darren Spurgeon, David Ufnar, Ping Wang, and Tao Yucong. We also thank the crews and support staff of the research vessels R/V Bellows, R/V Suncoaster (Florida Institute of Oceanography) and R/V Gilbert (U.S. Geological Survey) for their assistance. Technical reviews by Barbara Lidz and Bob Morton are greatly appreciated. DATA REFERENCES Color Infrared Digital Orthophoto Quarter Quadrangles (CIR DOQQ), (1994, 1995). USGS EROS Data Center, Sioux Falls, SD 57198. CD-ROMs. Landsat TM Image, February 18, 1997, path 17, row 40. USGS EROS Data Center, Sioux Falls, SD 57198. CD-ROM. 7.5-Minute Series (Topographic) Quadrangles. U.S. Geological Survey, Reston, VA 22092. REFERENCES Barnard, P.L., 1998, Historical morphodynamics of inlet channels: West-Central Florida: Unpublished MS thesis, University of South Florida, 179 p. Brame, J.W., 1976, The stratigraphy and geologic history of Caladesi Island, Pinellas County, Florida: Unpublished MS thesis, University of South Florida, 109 p. Brooks, G.R., Doyle, L.J., Suthard, B.C., and DeWitt, N.T., 1999, Inner West-Central Florida Continental Shelf: Sedimentary Facies and Facies Associations: U.S. Geological Survey Open-File Report 98-796, 124 p. Davis, R.A., 1994, Barriers of the Florida Gulf peninsula, in Davis, R.A., ed., Geology of Holocene Barrier Island Systems: Heidelberg, Springer-Verlag, p. 167-206. Davis, R.A., and Hine, A.C., 1989, Quaternary geology and sedimentology of the barrier island marsh coast, West-Central Florida: 28th International Geological Congress Guidebook T375, 38 p. Evans, M.W., Hine, A.C., Belknap, D.F., and Davis, R.A., 1985, Bedrock control on barrier island development: West-Central Florida coast: Marine Geology, v. 63, p. 263-283. Gelfenbaum, G. and Guy, K.K., 1999, Bathymetry of West-Central Florida: U.S. Geological Survey Open-File Report 99-417, CD-ROM. Locker, S.D., Brooks, G.R., Hine, A.C., Davis, R.A., Twichell, D.C., and Doyle, L.J., in press, Compilation of Geophysical and Sedimentological Data Sets for the West-Central Coastal Studies Project: U.S. Geological Survey Open-File Report 99-539, CD-ROM. Lynch-Blosse, M.A. and Davis, R.A., 1977, Stability of Dunedin and Hurricane Passes, Florida. Coastal Sediments '77: American Society of Civil Engineers, New York, p. 774-789. Stapor, F.W., Mathews, T.D., and Lindfors-Kerns, F.E., 1988, Episodic barrier island growth in southwest Florida: a response to fluctuating Holocene sea level?: Miami Geological Society, Memoir 3, p. 149-202. Yale, K.E., 1997, Regional stratigraphy and geologic history of barrier islands, West-Central Florida: Unpublished MS thesis, University of South Florida, 180 p. List of west-Florida coastal-transect series maps(1 sheet each): Transect #1: Anclote Key, USGS Open-File Report 99-505 Transect #2: Caladesi Island-Clearwater Beach Island, USGS Open File-Report 99-506 Transect #3: Sand Key, USGS Open-File Report 99-507 Transect #4: Indian Rocks Beach, USGS Open-File Report 99-508 Transect #5: Treasure Island-Long Key, USGS Open-File Report 99-509 Transect #6: Anna Maria Island, USGS Open-File Report 99-510 Transect #7: Longboat Key, USGS Open-File Report 99-511 Transect #8: Siesta Key, USGS Open File-Report 99-512 Transect #9: Casey Key, USGS Open File-Report 99-513