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|Nineteen grab samples were collected throughout the survey area in order to ground-truth
the sidescan-sonar mosaic (Fig. 4).
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.
|Figure 4. Map showing location of grab samples and sound velocity profiles.
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.
To view files in PDF format, download free copy of Adobe Acrobat Reader www.adobe.com/products/acrobat/alternate.html.