 Turtle Mountain stands immediately south of Frank . It consists of an older limestone layer folded over on top of softer materials such as shale and sandstone . Erosion had left the mountain with a steep overhang of its limestone layer . It has long been unstable ; the Blackfoot and Kutenai peoples called it " the mountain that moves " and refused to camp in its vicinity . In the weeks leading up to the disaster , miners occasionally felt rumblings from within the mountain , while the pressure created by the shifting rock sometimes caused the timbers supporting the mine shafts to crack and splinter . 
 Turtle Mountain <a href='uninflect' title='1'><mark>stands</mark></a> immediately south of Frank . It <a href='uninflect' title='2'><mark>consists</mark></a> of an older limestone layer folded over on top of softer materials such as shale and sandstone . Erosion <a href='been_done' title='3'><mark>had</mark></a> left the mountain with a steep overhang of its limestone layer . It <a href='uninflect' title='4'><mark>has</mark></a> long been unstable ; the Blackfoot and Kutenai peoples called it " the mountain <a href='null_relcl' title='5'><mark>that</mark></a><a href='uninflect' title='6'><mark>moves</mark></a> " and refused to camp in its vicinity . In the weeks leading up to the disaster , miners occasionally felt rumblings from within the mountain , while the pressure created by the shifting rock sometimes caused the timbers supporting the mine shafts to crack and splinter . 
Turtle Mountain stand immediately south of Frank . It consist of an older limestone layer folded over on top of softer materials such as shale and sandstone . Erosion done left da mountain witt a steep overhang of its limestone layer . It have long been unstable ; the Blackfoot and Kutenai peoples called it " tdamountain move " and refused to camp in its vicinity . In the weeks leading up to the disaster , miners occasionally felt rumblings from within thdaountain , while thedaessure created by the shifting rock sometimes caused the timbers supporting the dae shafts to crack and splinter .