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A.106 Method of SELF determination applied to sample 12 ................................................234 A.107 Granplot analysis of sample 050505-03A...................................................................235 A.108 Method of SELF determination applied to sample 050505-03A................................236 A.109 Granplot analysis of sample 050505-03B...................................................................237 A.110 Method of SELF determination applied to sample 050505-03B ................................238 A.111 Granplot analysis of sample D....................................................................................239 A.112 Method of SELF determination applied to sample D .................................................240 A.113 Granplot analysis of sample C ....................................................................................241 A.114 Method of SELF determination applied to sample C .................................................242 A.115 Granplot analysis of sample G....................................................................................243 A.116 Method of SELF determination applied to sample G .................................................244 A.117 Granplot analysis of sample 011106-09......................................................................245 A.118 Method of SELF determination applied to sample 011106-09...................................246 A.119 Granplot analysis of sample 011106-10......................................................................247 A.120 Method of SELF determination applied to sample 011106-10...................................248 A.121 Granplot analysis of sample F.....................................................................................249 A.122 Method of SELF determination applied to sample F..................................................250 A.123 Granplot analysis of sample B ....................................................................................251 A.124 Method of SELF determination applied to sample B .................................................252 A.125 Granplot analysis of sample A....................................................................................253 A.126 Method of SELF determination applied to sample A .................................................254 A.127 Granplot analysis of sample E ....................................................................................255 A.128 Method of SELF determination applied to sample E..................................................256 xviii
ABSTRACT The goal of this investigation was to determine whether highly accurate sampling and dating methods could be employed to develop a high-resolution history of barrier evolution and sea-level change. The focus of the study was St. Vincent Island, an undeveloped barrier island beach ridge plain in the northeastern Gulf of Mexico. The island consists of more than 100 beach ridges organized into a dozen groups or sets based on their topographic expression and geographic pattern. These ridges represent sequential paleo-shoreline positions over the 4000+ year history of the island. Given the long-term tectonic stability of the northern Gulf of Mexico throughout the Quaternary, the island holds the potential for a unique high-resolution chronology of mid- to late-Holocene sea-level change. The sampling of the beach ridges by means of trenches, rather than just cores, allowed for the collection of basal deposits as well as visual confirmation of the origin and structure of the ridges. Ground penetrating radar (GPR) profiles confirmed the origin and structure of the ridges. Based on these techniques it is evident that the beach ridges on the island were built by swash processes rather than by storms. The direct dating of quartz grains collected from the base of several of the islands beach ridges via optically stimulated luminescence dating (OSL) provided an accurate measure of the depositional ages of the ridges. The ridges on St. Vincent Island have ages ranging from zero to 4,100 years, with the oldest ridges on the north side of the island and the youngest ridges on the southeast side of the island. These ages can be correlated with the most recent sea level curve produced for the northern Gulf of Mexico. These ages have also been used in conjunction with topographic maps, leveling or topographic profile surveys and LIDAR data, to calculate the rates of beach ridge plain progradation and beach ridge formation over time. Results show that during times of sea level fall, the progradation rates on St. Vincent Island were relatively fast while during times of sea level rise, rates were considerably slower. The result of this project is a better and more detailed understanding of the influence of sea-level change on barrier island development. xix
Page 1 and 2: THE FLORIDA STATE UNIVERSITY COLLEG
Page 3 and 4: ACKNOWLEDGEMENTS I would like to th
Page 5 and 6: 4. RESULTS Laboratory Analyses ....
Page 7 and 8: LIST OF FIGURES 1.1 Location map of
Page 9 and 10: preheating is carried out on a heat
Page 11 and 12: 4.17 Site SVI 023. a) Trench. b) Sa
Page 13 and 14: 4.38 Location relative to the Apala
Page 15 and 16: A.37 Granplot analysis of sample 05
Page 17: A.83 Granplot analysis of sample 05
Page 21 and 22: 4) To further develop Optically Sti
Page 23 and 24: the rate of erosion or deposition a
Page 25 and 26: esult of the buildup of offshore ba
Page 27 and 28: Recent studies of barriers using Gr
Page 29 and 30: and, therefore, sea level) (Dorsey,
Page 31 and 32: Holocene Sea Level Over 900 Holocen
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Page 35 and 36: Figure 1.2. Beach ridge sets on St.
Page 37 and 38: -100 Figure 1.4. Pleistocene glacia
Page 39 and 40: Figure 1.6. The Apalachicola River
Page 41 and 42: Figure 1.8. Global sea-level histor
Page 43 and 44: K and L have crest elevations of ap
Page 45 and 46: Geoarchaeology The earliest inhabit
Page 47 and 48: Oyster Pond Figure 2.1. Infrared or
Page 49 and 50: Figure 2.3. St. Vincent Island shor
Page 51 and 52: Pickalene Middens Paradise Point Si
Page 53 and 54: At each vibracore or trench locatio
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Page 57 and 58: Application of OSL to Coastal Studi
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Figure 3.5. Sample removed from lar
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Figure 3.7. Location of samples col
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Figure 3.9. Basis of airborne LIDAR
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Sample Sites CHAPTER 4 RESULTS A to
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SVI005 This site is located just we
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collapsed the trench. Therefore, a
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SVI025 This site is located within
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m and 3.7 m respectively. A cross s
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Vincent Island has changed little o
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(sorting). Standard deviation decre
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4,100 and 3,500 years ago. The corr
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Table 4.1 Continued Site Samples Be
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Table 4.3. Measured elevations of S
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Table 4.5. Application of Tanner’
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Table 4.7. OSL age calculations usi
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Table 4.9. Paleosealevel position e
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Figure 4.2. Example of a trench thr
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Figure 4.5. Site SVI 003. Trench ex
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a) b) 050505-01E 050505-01K 050505-
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a) b) 050505-04C 050505-04A Figure
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Figure 4.13. Site SVI 015. Vibracor
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a) b) 011006-15 011006-16 Figure 4.
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a) b) 011106-08 011106-07 011106-10
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Figure 4.21. Dutch gouge-auger core
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Figure 4.23. Line A-A’ represents
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Elevation (m) NAVD 88 5.00 4.50 4.0
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1200 +/- 100 yr 102 Figure 4.27. GP
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0.65 Set C 0.6 0.55 0.5 Set A 0.45
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6 Set B Set C Set E 5 Set A Set F S
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0.7 Set C 0.6 Set A 0.5 Set E Set F
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ENVIRONMENTS OF DEPOSITION -- SKEWN
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mean grain size (phi) 3 2.5 2 1.5 1
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SVI 015 SVI 002 SVI 003 114 SVI 004
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CHAPTER 5 DISCUSSION The beach ridg
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vibracore or trench, both of which
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Skewness can be used to identify th
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island. Another is a C-14 date of 2
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sea level. It was at this point tha
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The fourth hypothesis was that sea-
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APPENDIX A INDIVIDUAL SIEVE ANALYSI
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Berger, G., 1988, Dating quaternary
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Douglas, B., Kearney, M. and Leathe
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Jol, H.M., Peterson, C.D., Vanderbu
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Northwest Florida Water Management
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Stapor, F.W. and Tanner, W.F., 1977
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BIOGRAPHICAL SKETCH Beth Margaret F
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