Marcus Landslide Hike at Tom's Thumb Trailhead Visit the Marcus Landslide geological site, second largest landslide in Arizona. The elevation gain is 400 ft. Location: Tom’s Thumb Trailhead - 23015 N 128th St, Scottsdale, AZ, 85255 Skill level: Moderate Distance: ~4 miles Time: ~2.5 hours Pets are not permitted at our activities due to safety