Oak and bigleaf maple leaves can litter the ground in Yosemite during Autumn. These pictures were taken in the Valley, near the Mariposa Grove, and along the Mist Trail.
Canon EOS 1v, Sigma 28-70 f2.8
zoom at 50 mm, Fuji Velvia 100 (2003)
Canon 30D, 1D Mk. II, or 7D2; 17-40, 24-105 IS, 70-200/4 IS, or Tokina 11-16 lenses 100 (2007, 2016)