UIS Commission on Karst Hydrogeology and Speleogenesis
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Karstbase Bibliography Database

Grimes, Ken G.
Karst and paleokarst features involving sandstones of the judbarra / gregory national park, northern territory, australia
Helictite
2012
41
67
73

In addition to carbonate karsts, the Judbarra / Gregory National Park of tropical northern Australia has karst and paleokarst features associated with Proterozoic sandstone units. On a sandstone plateau in the Newcastle Range, there are several large collapse dolines formed in the Proterozoic Jasper Gorge Sandstone. As there is a carbonate unit, the Proterozoic Campbell Springs Dolostone, lying about 110 m beneath the plateau surface, these sinkholes may be subjacent karst features resulting from the upward stoping of large cave chambers. In the Far Northern area of the Judbarra Karst Region, areas of chert breccia are shown on the geological maps, and linear bodies of brecciated sandstone are inset into the carbonate beds of the Skull Creek Formation. The sandstone is derived from the Jasper Gorge Sandstone, which overlies the Skull Creek Formation in adjoining areas. The breccia is interpreted as paleokarst of uncertain age resulting from subsidence of the sandstone into karst trenches or collapsed cavities developed in the underlying carbonate beds.

Karst; sandstone; subjacent karst; paleokarst; Australia
Grimes, Ken G., 2012, Karst and paleokarst features involving sandstones of the judbarra / gregory national park, northern territory, australia , Helictite , 67 - 73 http://helictite.caves.org.au/abstracts4.html#41.00.005, PDF