This erupted in the upper Silurian period over the top of the Deakin Volcanics rhyodacite which is visible on the surface on the lower slopes in the east and southeast sides.

The summit of the mountain where the telescopes are located is elongated in a north–south direction, with a spur running to the southwest where the water treatment plant is situated.

The fire, fuelled by the pine plantation that covered the mountain, destroyed or badly damaged much of the observatory and water treatment plant.

The site hosted the UCI Mountain Bike & Trials World Championships, attracting over 30,000 visitors from 40 countries.

Beyond mountain biking, Stromlo Forest Park also features an event pavilion, cafe, kids' play area, road cycling circuit, running track, and equestrian trails.