Ever wonder about the fascinating mountains and rock formations in our area? Join geology professor, A. J. Lombard, as he shares a wealth of information about the geology of the East Valley on this 1-mile interactive walk. Bring your curiosities and questions to Usery Park and discover lots of amazing things about our local geology! The Merkle Trail offers universal access and the hard-smooth surface of this trail accommodates wheelchairs and strollers. Location: Area 6.