Rock Glen Conservation Area, Conservation area in Lambton County, Canada.

Rock Glen Conservation Area is a protected natural space in Lambton County featuring a waterfall, walking trails through forested areas, and exposed fossil beds along the steep walls of Ausable Gorge. The landscape reveals layers of rock that tell the story of this region's ancient past.

Rock Glen lies in a transition zone between Carolinian forest and the Great Lakes St. Lawrence zone. Paleolithic peoples hunted caribou on nearby hills about 10,000 years ago, followed by Archaic First Nations around 6,000 years ago. Pioneer settlers in the mid-1800s built grist mills here, one powered by an 11-metre overshot wheel. In 1907 the Rock Glen Power Company built a small hydro-electric dam on the Ausable River; after Ontario Hydro formed, it ceased operation shortly after the Second World War and a Canadian Army demolition squad blew it up with dynamite at anglers' request. The Ausable Bayfield Conservation Authority, Ontario's first, was created in 1946; the Bayfield watershed was added in 1971.

The Arkona Lions Museum exhibits Devonian period fossils, Aboriginal artifacts, and Clovis Point Meadow Cache Blades from early First Nations settlements.

Visitors should wear sturdy footwear and bring weather protection, as trails descend into the valley and can become slippery when wet. The site lies along a river valley, so checking conditions and arriving early is wise, especially on warmer days when crowds gather.

Visitors are allowed to collect and take home marine fossils from the Devonian period, an activity uncommon in most protected natural areas. This opportunity makes the place unusual for fossil enthusiasts of all ages.