Once he found a straight juniper he liked, he pummeled its base, chopping through bark and wood layers with blow after blow.
Eventually, he was able to safely push the tree over onto the ground.
, astronomer Andrew Ellicott Douglass of the University of Arizona published the first tree-ring dates for Mesa Verde.
(Why, you ask, was an astronomer studying tree rings?
They occurred at only four cliff dwellings—one of which was Spring House.