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Recent HI emission observations of the Southern Galactic hemisphere haverevealed a mushroom-like structure extending from z=-70 to -450 pc, composed ofa stem and a cap. Similar structures occur in three-dimensional simulations ofa dynamic galactic disk driven by isolated and clustered supernovae. Usingthese simulations, we show that hot gas in the Galactic disk that is notevacuated through chimneys expands into the cooler gas of the thick disk,forming mushroom-shaped structures. This new class of objects traces buoyantflow of hot gas into the thick disk.Comment: Accepted for publication in ApJ Letters. Latex manuscript, 3 figures  (4 postsript files

Mushroom-shaped Structures as Tracers of Buoyant Flow in the Galactic Disk