Marcus Landslide Fitness Hike at Tom’s Thumb Trailhead This Moderate hike visits the Marcus Landslide geological site, second largest landslide in Arizona. The elevation gain is 400 ft. over 4 miles in about 2.5 hours. Restrooms available at the trailhead. Bring water and snacks for the trail.  No dogs please. Arrive 15 minutes before start of hike.