Scientists have uncovered a strange geological phenomenon beneath the North Sea that flips the rulebook on its head—and it could have big consequences for energy and carbon storage.

Researchers from The University of Manchester, working with industry, used high-resolution 3D seismic imaging and rock data from hundreds of wells to reveal hundreds of massive sand formations, some several kilometres wide.

But here’s the twist: instead of sitting above older material, these dense sand bodies have sunk downwards, displacing lighter, softer layers beneath them.

The result is something called stratigraphic inversion—where the normal geological order is flipped. Though this has been seen before at small scales, the newly discovered “sinkites” are the largest ever documented.

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