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Chapter 3 - Benthic HabitatsMid-Atlantic BightTable 3-8. Physical factor values that correspond to ecological thresholds in the Mid-Atlantic Bightsubregion.Bathymetry (m) Sediment Grain Size (mm) Seabed FormDepth (meters below sea level)050100150200250300350400450500550600650700750800850900950100010501100115012001250130013501400145015000-15 0-0.18 (silt and very fine sand Depression15-22 0.18-0.35 (fine sand) Mid Flat22-45 0.35-0.36 (sand) High Flat45-48 0.36 -0.48 (sand) Low Slope48-82 >=0.48 (coarse sand) Sideslope82-95 Steep95-592>592Benthic Habitat Types: Mid-Atlantic BightBH:768BH:64BH:87BH:38BH:1BH:7BH:2BH:32BH:4BH:25BH:233BH:592BH:306BH:395BH:218BH:520BH:84BH:1223BH:219BH:44BH:229BH:216BH:384BH:505Figure 3-18. Average depth and range of each benthic habitat type in the Mid-Atlantic Bight subregion. Lines represent twostandard deviations above and below the mean. Habitat types with the same depths often differ from each other by sedimentgrain size or topographic location. Habitats with very large depth ranges are widespread associations often unrelated to, oronly weakly correlated with, depth.Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report 3-43