One of the better known Ontario Caves (amongst cavers)
As of late there seems to be a lot of interest in Dewdney’s cave. This was probably the first Ontario solution cave that I had visited. Entrance into Dewdney’s is by several collapsed slabs and also its signature triangular shaft.
The shaft enters into a passage that is generally ankle to knee deep in water and as the bugs are so outrageous it is always a hurry to enter the tunnels. Dewdneys is situated at the edge of the Canadian Shield in Bobcaygeon formation limestone. Though the picture may not show it the rock is pure and white and well known amongst local cavers for its cave forming potential.
If you were to imagine a bowl that was centered over Michigan, its outer edges running along the edge of the Canadian shield, you would more or less know that the Bobcaygeon rock makes up the bowl’s upper/outer lip. In a fortunate caving co-incidence, this pure limestone is set right up against the shield in various places and so it takes the flow of especially acidic water from that area – hence an increased level of tunnel formation.
Dewdneys is a well known system amongst Ontario cavers. Marcus has mapped a good portion of it and says that it runs on well beyond where most might imagine it. Other cavers report similar tunnel systems nearby and I suspect there is still a lot to be found. Apparently Marcus (an expert) says that there is a mysterious gap between the longer systems in Ontario and the smaller. We should exect that ther are many more caves hidden beneath the glacial debris of an intermediate length.
My point is – KEEP LOOKING! There is lots more to find. Let me know what you discover.