A form replica of a barrier chain and lagoonal basin at depths of 7-9 fathoms on the outer shelf off South Cat Cay, Great Bahama Bank, is described and illustrated by a contour chart with 1-fathom intervals. The configuration suggests a former seastand at about 8 fathoms, shown in a
chart with a shoreline drawn at the 8-fathom contour. A channel that crosses the shelf west of the southern end of North Cat Cay is interpreted as having been formed by surface drainage during a very low seastand.
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