FIGURE 6. Bones beneath a modern owl roost near Sugarloaf Mountain, Arizona, sampled for comparison with Pliocene microvertebrate bones from the House Mountain locality in the Verde Formation. 6.1-6.4. Photos show removal of successive samples from Plot 1. A second plot was sampled similarly. Outer orange frame is 0.5 m x 0.5 m, approximately the size of the Pliocene deposit, with the smaller grid squares delimited by green wires each measuring 10 cm x 10 cm.