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0008444Dwarf FortressGeologypublic2014-10-18 09:212014-12-30 20:30
kicking jay 
 
lowminoralways
newopen 
PC
0.40.13 
 
0008444: Cast obsidian, when mined away, will leave a floor of the surrounding stone
I flooded the top of a volcano and channeled it away. Instead of leaving an obsidian floor, it left a floor of the matrix stone, as if it were a mineral vein. In this case, it was half shale and half sandy clay, as the volcano intersected a hill face.

Obsidian not generated with the world should leave obsidian floors.
Mix any water and magma, mine away.

As far as I know, this will always behave this way.
No tags attached.
related to 0006896confirmed Footkerchief Mining a vein or cluster leaves floor tiles of the layer stone (natural cave formation doesn't) 
related to 0003468resolved Loci Mining created obsidian pillars causes created floor above to crash down 
has duplicate 0009546resolved Knight Otu Obsidian casting creates sand floors 
Issue History
2014-10-18 09:21kicking jayNew Issue
2014-10-18 09:50QuietustNote Added: 0030661
2014-10-27 11:47FootkerchiefRelationship addedrelated to 0006896
2014-12-30 20:30FootkerchiefRelationship addedrelated to 0003468
2016-02-09 04:38Knight OtuRelationship addedhas duplicate 0009546

Notes
(0030661)
Quietust   
2014-10-18 09:50   
Another variant of 0006896