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Rezak and Sidner Banks are described as a single unit because they belong to a single geological structure, the center of which forms two banks located at 27.95°N and 92.38°W. The Rezak-Sidner Bank is rectangular in shape and covers an area of 78 square km. Although it is a single structural unit, the bank can be divided into northern and southern halves on the basis of bathymetry. The shallowest portion of the northern half (Rezak Bank) has a minimum depth of 60 m on a peak at the northeast corner of the structure. Depths of the adjacent seafloor around the northern half are 120 to 140 m on the north and east sides and 98 to 110 m on the west. The northern half is twice the width of the southern half and has a gentle slope to the west (about 10 m/km). The southern half has a minimum depth of 55 m on the ridge that forms the eastern margin and surrounding depth of 140 m to 180 m.
Location on Continental Shelf: Outer-Shelf Bank
Coordinates: 27.95° N 92.38° W
Nearest Largest City: New Orleans, Louisiana, USA
Area of Coverage: 78 km2
Minimum Depth: 55 m
Maximum Depth: 180 m
Marine life incident at the banks include fishes, sponges, coralline algae and other mobile invertebrates.
Structurally, Rezak-Sidner Bank is a tilted fault block of well-stratified sedimentary rock that has been uplifted on the east and dips to the west. It is bounded by steeply dipping normal faults on its east, north and south sides and a gentler slope to the west. Local depressions are abundant at the base of the northern, eastern and southern slopes, but the eastern slope has irregular and complex relief. A saddle in the middle of the bank appears to be a structural and erosion feature. Faults are not common within the main body of the bank, but two normal faults control the topography of the saddle in the middle. One apparent gas vent exists in the southwest corner of the bank and another at a depth of 69 m just south of the 62 m peak in the southwest. The dominant sediments at the top of the bank are coralline algae nodules and coarse carbonate sand, which are equivalent to the sand facies at the Flower Garden Banks.
Rezak, R., T.J. Bright and D.W. McGrail. 1985. Reefs and Banks of the Northwestern Gulf of Mexico: : their geological, biological, and physical dynamics. Wiley, New York, NY, USA, 259 p.
USGS - Northwestern Gulf of Mexico
Keywords: Gas vent, Coralline algae, Saddle, Bank
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