In seed 1351816683350146382 of Minecraft 1.7 pre-release, some layered clay spikes of the Mesa (Bryce) biome occur in a Beach area with water and clay underneath them. I took two screenshots, one above and one below water level. I assume the layer of water underneath would be considered a bug, though it's sort of like a sky island, except with water instead of air.
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CubeTheThird
I only searched "mesa" and looked at a few bug reports, which was, I s'pose, why I didn't find the duplicate report. Thanks for the help.
Duplicate of MC-30560 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.