The map location is not correct. This
cave was re-discovered in 1947 by Capt. J.M. Thompson (Harbormaster at
Port Lincoln)
His location diagram shows Catacombs half a mile N-E of
Knowles Cave. (He actually discovered and named
Knowles Cave as being half a mile S-W of Catacombs). Correct location is seen on Google Map at -31.136,130.624. His description of
the entrance reads:
"Entrance to the Catacombs is in a stony outcrop (pl. iv, fig. 1) scattered with
small
quandong trees, the actual entrance being a blow-hole about 3 feet in diameter
and 25 feet deep. The sink-hole or depression surrounding this
blow hole is
70 feet long by 35 feet wide but only 10 feet deep. "
Complete article can be viewed at
http://archive.org/details/TransactionsRoy73Roya
see pages 48-58, and the following three plate pages
Catacombs entrance
Catacombs locality sketch
Catacombs Google Earth