File:Bedrock patterns in spawn.png

Summary
Bedrock version map in spawn within 6000 blocks. Black is the general Beta 1.3 - Beta 1.7 bedrock pattern (used in all Beta 1.3 - Beta 1.7 chunks devoid of sandstone). In a version of CraftBukkit from February 9th 2011, this pattern was also used everywhere in the world due to sandstone not being added yet. Blue is the pattern used with 2b2t's first overworld seed in versions Beta 1.3 - Beta 1.7. The other colors are from future versions and from different bugs, backdoors, and when Hausemaster generated natural strongholds.