I loaded up a new world for 1.4 and got a chopped looking mountain. I think it may be a terrain generation bug
Seed: 5237325308549975333
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Let me know if you need more pictures and the seed.

What's the seed?

It looks like the level.dat file got corrupted (when this happens, the seed gets lost, and superfat maps turn into default)

Possibly related to MC-315?

It probably is related to that.

I've been wondering why minecraft doesn't store the seed in a more secure location than the level.dat file.

This reminds me when I updated a Beta 1.7.3 world to Beta 1.8.1; some chunks have chopped mountains due to the new terrain generation code.

Seed: 5237325308549975333

It also appeared to only happen when the icy mountain biome collided with others.

Duplicate of: MC-1091 - Linking to parent for reference.