Cape Range

A limestone peninsula riddled with caves. The hydrogeological setting of the Cape Range can be equated to that of a small island in the ocean. Rainwater soaks into the ground & permeable rock (ie limestone !) and forms a fresh water ?lens? that sits on top of the saline waters beneath. The presence of the freshwater lens means that caves form in the limestone where the freshwater flows towards the ocean and the rock has weaknesses where flow concentrates (happens very slowly). This water flow dissolves the limestone and as spaces between the grains of rock get bigger, abrasion speeds the process and makes the conduits which in turn carry the majority of the fresh water flow to the sea.
There is evidence that the mixing zone between the fresh and salt water within the rock causes very rapid development (geologically speaking of course !!!) of water filled conduits ? far quicker than those created by the flow of freshwater alone. It?s remoteness and harsh climate (either scorching hot or cyclonic rains) keeps most prying eyes away.

Dive Locations in Cape Range

Yardie Creek

Local Legend had it that in the water under the main South Wall of Yardie Creek there was a monster cave entrance. As the photos will attest, there was some basis in fact to this but alas, no monster cave diving passages are attached !! John Renwick & Paul Hosie did their first dive in … Continue reading Yardie Creek

29/01/2015 05:45 hrs
by
trimixguy

Solution Tube Cave

Located on the coastal plain near Exmouth, there are numerous water filled rockholes. The rockholes are actually solution tubes that penetrate the thin surface cap rock into the honeycombed limestone below. Because the water level is only 1-2m below the surface, most solution tubes are water filled, the water being either brackish or fully sea … Continue reading Solution Tube Cave

29/01/2015 05:45 hrs
by
trimixguy

Gnamma Hole

This is a very interesting sister site to Dozer Cave (C203) and a masochist?s dream !!! The solution tube entrance through dense conglomerate rock is . . . tight. Those of slightly portly or herculean proportions should avoid this cave. A gravity assisted descent is possible, but the exit with one arm above the head … Continue reading Gnamma Hole

29/01/2015 05:45 hrs
by
trimixguy

Cave C215

From beneath a shroud of fig trees on a karst ridge near Exmouth lies the concealed cave entrance of C215. This multilevel cave has speleothem decorations and fig tree roots all the way down & into the water table. A couple of restrictive floor holes brings you to the bottom level ? where a muddy … Continue reading Cave C215

29/01/2015 05:44 hrs
by
trimixguy

Wet Caves and Shipwrecks Australia