Qualla: Bahama Banks

Bahama Banks: Introduction

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. From orbit, they look like a painter spilled turquoise ink across the dark Atlantic. The Bahama Banks are submerged carbonate platforms so vast and shallow that sunlight reaches the white sand bottom, turning the sea above into shades of aquamarine that satellite cameras capture in startling clarity. The European Space Agency has featured them as one of Earth's most visually striking formations from space. Yet what appears from above as a simple wash of color is actually one of the oldest continuously accumulating geological structures on the planet, a column of limestone over 4.5 kilometers thick that has been building since the age of dinosaurs.

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Image: Brocken Inaglory | CC BY-SA 4.0

Bahama Banks: A Platform Built by Time

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. The limestone beneath the Banks has been accumulating since at least the Cretaceous period, roughly 145 million years ago, and possibly since the Jurassic. All of it was deposited in shallow water, which presents a geological puzzle: how does a shallow-water formation grow to a t...

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Image: Brocken Inaglory | CC BY-SA 4.0

Bahama Banks: The Banks and the Ice Ages

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. During past ice ages, when sea levels dropped as much as 120 meters below their present mark, the Bahama Banks were dry land. The Bahamas we see today, scattered islands and cays covering a modest area of ocean, represent only a small fraction of their prehistoric extent. When ex...

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Image: Brocken Inaglory | CC BY-SA 4.0

Bahama Banks: Edges and Abysses

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. The Banks are not a gradual slope into deep water. Their edges are startlingly steep. Where the Great Bahama Bank meets the Tongue of the Ocean, the seafloor drops from a few meters to over 2,000 meters in a near-vertical wall. This is one of the most dramatic bathymetric transit...

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Image: Brocken Inaglory | CC BY-SA 4.0

Bahama Banks: The Lucayan Archipelago's Hidden Architecture

Fri, 06 Mar 2026 00:00:00 GMT

Photo credit Nzeemin, CC BY-SA 3.0. The term "Bahama Banks" usually refers to the two largest platforms: the Great Bahama Bank surrounding Andros Island, and the Little Bahama Bank beneath Grand Bahama and Great Abaco. But the geological story extends far beyond the Bahamas themselves. The Cay Sal Bank, the Caicos ...

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Image: Nzeemin | CC BY-SA 3.0