A cross section of an esker showing it's size, and the mixture of sand, gravel and rocks in it. It was formed by a sub-glacial river 14,000 years ago. This one runs from Picton almost to West lake. Another shorter one is found at Cherry Valley.

A cross section of an esker showing it's size, and the mixture of sand, gravel and rocks in it. It was formed by a sub-glacial river 14,000 years ago. This one runs from Picton almost to West lake. Another shorter one is found at Cherry Valley.

Ridge Road runs along the top of an esker which is a sand and gravel deposit left from the last ice age 14,000 years ago. Rivers flowing in crevaces or under the ice gathered up all sorts of rubble and deposited it in meandering ridges, sometimes 10's of km. long. You can see water deposited sand layers at the top left side, yet no river or lake is around here anymore. — Ridge Road runs alon…