The caverns of Mount Austral, like those of other limestone formations in various parts of the world, had been formed in some remote geological period by the solvent action of water charged with carbonic gas upon the limestone rocks.
(The caverns of Mount Austral; had been formed; T:in some remote geological period by the solvent action of water) (water; charged; with carbonic gas; L:upon the limestone rocks)
The caverns of Mount Austral water
had been formed charged
T:in some remote geological period by the solvent action of water
with carbonic gas L:upon the limestone rocks