• Introduction
  
• Methods
  
• Data
  
• Seismic Profiles
• Sidescan-Sonar Mosaic
• Bathymetric Image
• Navigation
• Grab Samples
• Sound Velociy Profiles


• Acknowledgements
  
• Figure Captions

Data
Grab Samples

Nineteen grab samples were collected throughout the survey area in order to ground-truth the sidescan-sonar mosaic (Fig. 4). Figure 4. Map showing location of grab samples and sound velocity profiles. All samples were sieved through a 2 mm sieve in order to separate the coarse fraction (almost all shells and shell fragments) from the fine fraction. No detailed grain-size analyses were conducted. Photographs and percent fine and coarse fraction for each sample are listed in the table below. Two photographs are displayed for grab sample 10, BL02-b10; one photograph of the entire sample, fine and coarse fractions, and a second photograph showing only the coarse fraction. High-backscatter regimes throughout the study area are characterized by high concentrations of shells, as shown by the coarse fraction of grab sample 10, BL02-b10. Low-backscatter regimes consist primarily of calcareous mud, or marl. Grab sample locations and images are displayed below and can also be viewed within the ArcView project file stored on this CD-ROM. See GIS Data for more information. Grab Sample Data Sample ID Percent Fine Fraction (%) Percent Coarse Fraction (%) BL02-b1 99.8 0.2 BL02-b2 57.5 42.5 BL02-b3 87.6 12.4 BL02-b4 99.9 0.1 BL02-b5 53.5 46.5 BL02-b6 21.7 78.3 BL02-b7 94.1 5.9 BL02-b8 100.0 0.0 BL02-b9 94.4 5.6 BL02-b10 58.0 42.0 BL02-b11 31.9 68.1 BL02-b12 76.2 23.8 BL02-b13 100.0 0.0 BL02-b14 45.0 55.0 BL02-b15 97.0 3.0 BL02-b16 98.8 1.2 BL02-b17 100.0 0.0 BL02-b18 100.0 0.0 BL02-b19 97.9 2.1 BL02-b20 99.7 0.3

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