cave formation fold draperies low-angle in jenolan caves, australia

attraction australia australian background calcite canopy cave cavern caves chamber crystalline deep deposits discovery display draperies elements exploration flow flowstone flowstones fold folds forces formation formations geological geology illuminated impressive inside large light lighted limestone magic mineral minerals natural nature pattern rock scene scenery sheets silurian sloping spectacular speleology speleothem structural structure structures subterranean symmetry texture timeless treasure underground underworld wall geometric shapes layering layers fascinating hall low-angle jenolan details