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The southeastern shore of the Hudson Bay forms a near perfectly curved shoreline.

Called the Nastapoka Arc, this curved shoreline has prompted an ongoing debate over its formation.

Read more about this geologic puzzle: https://go.nasa.gov/3XS8DPx 🪨 🧩
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Hudson Bay’s Nastapoka Arc

The origin of this nearly perfectly curved shoreline, a feature not often found in nature, has prompted an ongoing geologic debate.
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in reply to NASA

Nathalia Assaad
Nathalia Assaad
• •
1) Continental collision 2 billion years ago: Trans-Hudson orogeny (most likely explanation)
2) Ancient impact structure, but no evidence of material so not likely
3) Ancient impact crater with so much geological processes since, evidence of impact is lost.
4)Circular tectonic plate on a continent made it pull apart like a puzzle.

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