FLORISSANT — California’s towering sequoias — those massive redwoods whose lumber graces my backyard deck — are enormous plants. They grow nearly as tall as a football gridiron is long and sport trunks nearing a first-and-10 in diameter. What better way to spend a sunny Sunday, I figured, than to stroll through Colorado’s own forest of hulky redwoods? Our state’s grove of titanic trees, at least their petrified remains, stands in Florissant Fossil Beds National Monument, about 35 miles west of Colorado Springs off U.S.