Mount Boothby Conservation Park includes the 129 metre high Tolmer Rocks and is the highest outcrop of granite overlain with limestone within the park.
Tolmer Rocks is located just off Homestead Road and is a similar rock formation to Boothby Rocks. The site takes its name after Police Inspector Tolmer, who pioneered a track from Adelaide to the Mount Alexander goldfields in Victoria and by 1852 Government wells and direction boards were erected along this route. The wells at the Homestead and Reedy Wells were regular watering points for Tolmer's Escort team.
The limestone and sandy ridges are covered in Mallee with a heath understorey. The vegetation consists of dwarf oaks, tea trees, yaccas and desert banksias, all of which grow in the sand flats. The park produces beautiful wild orchids in the spring. Mallee fowl breed here, and the western grey kangaroo and echidnas are common.
Tolmer Rocks is a popular picnic and camping area.