Thunder Knoll

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Thunder Knoll 16°27′N80°20′W / 16.450°N 80.333°W / 16.450; -80.333 is a reef knoll about 18 km in extent and composed of coral sand. It lies approximately 6 km west of the north part of Rosalind Bank. Depths over this bank range from 11 to 27 m.

A reef knoll is a land-based landform that comprises an immense pile of calcareous material that accumulated on a previously existing ancient sea floor. At the time of its accumulation it may have had enough structure from organisms such as sponges to have been free-standing and to withstand the sea currents as material accumulated, and was likely an atoll. Another possibility is the remains of deep water coral. Such structures are thus often fossil-rich.

Rosalind Bank Submerged bank in Nicaragua Rise, Caribbean

Rosalind Bank, also called Rosalinda or Rosa Linda Bank, is a large, completely submerged bank or atoll that lies with its southern extremity 269 km (1677 mi) ENE of Cabo Gracias a Dios, at 16°26′N80°31′W. It is the culmination of an area of coral reef some 300 km (186 mi) long that is stretching out eastward from Cabo Gracias a Dios. The bank area is part of an extensive structure that continues further east through Pedro Bank towards Jamaica and is known as Nicaragua Rise.

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