Benthic mapping surveys were conducted from March 1999 to January 2001 aperiodically in support of research related to sedimentology, sea level history, and reef development. Various parameters such as substrate, coral, and coralline algae types and percent bottom coverages of each were quantified using the Linear Transect Method (LTM) or Line Intercept Technique along 30 m transects at typically -3 or -20 meters depth. Various derived parameters such as abundance and diversity were also determined.