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# Big Four Mountain
- URL: https://www.cascadepbs.org/show/nick-rocks/episode/big-four-mountain-wf4ba4/
- Published: 2024-03-30T01:00:30.000Z
- Updated: 2026-04-14T19:30:24.000Z
- Description: Big Four Mountain's mystery: 82-degree tilted rock layers defy geology's horizontal rule.
- Author: Cascade PBS Staff
- Tags: Nick on the Rocks, Season 5, Episode 4, #ZZZ_Episode_2ad75ee3-3012-4df0-a070-cfb0e0c70eec, #episode, #ZZZ_Show_fb43f9d5-44f4-411a-854a-568025965642, #v1.16

There’s a basic rule in geology: Sedimentary rock layers build up horizontally. So how did the slabs of Big Four Mountain in Western Washington end up with nearly vertical layers, tilted 82 degrees away from their original positions?