Conglomerate boulders are found between mile markers 1 and 3 on both sides of the canyon. Several are mere feet away from the stream and others are about a 5 minute hike up the west side of the canyon via the approach to the "Rattle Horn Craig". Metamorphic Shale and Lime Stone boulders are 5 miles up the canyon. You will see two Metamorphic Shale ridges (boulders) on the west side of the canyon that are only 1 to 3 feet from the road. About a 1 minute drive past that on the west side of the canyon you begin to see limestone buttress rising along the sides of the canyon, keep an eye out and you will be able to see the lime stone boulders through the foliage from the road just after you pass a yellow diamond sign (also on the west side of the road so if your heading up the canyon you will see its steel back) also I forgot what it says. They are on top of small hill and there is a faint trail leading to them. These are my favorite boulders in the canyon. If you reach the weeping rock memorial bridge you've gone to far. If you can't find the boulders via this description track down an old mountain goat by the name of Lange Jefferies. He is the sage of city creek and will show it's secrets in exchange for a 30 rack and the opportunity to climb with you. Basically this place is cool if you sick of the little cottonwood canyon boulders but don't want to drive very far.