Field Notes Doug Bell Pine Canyon, Contra Costa Co., Calif. April 2, 1984 Pat Sander and I hiked up through Pine Canyon, from Castle Rock Park all the way to the upper reservoir, beyond the power lines and rock areas. Gary Beeman had told me that he saw Prairie Falcons + Bill Swaringen on one of the smaller rocks on March 19, 1984; and saw them incubating in a pot-hole on April 1, 1984. He told me the birds were on a rock due east from the horse-gate. Pat and I hiked up the canyon, stopping to scan all the rocks along the way. As usual, there was lots of human activity: hikers, horseback riders, mountain bikers. Several groups of people walking up about the cliffs too. The first long cliff face, as one hikes up the canyon, is the one that had Peregrines on it in the 40's. This rock is pictured in the 1985 Peregrine book. This rock also gets a lot of human activity. There is a smaller rock with a large cavern just in front of this old peregrine rock. Still further up the canyon is the big, deep, thick rock. It is massive, but relatively low in the canyon. The old stick nest appears to have been added on, as it now reaches nearly to the top of its crevess. Up from this massive rock are two more [crossed out] medium-size formations - one with a pinnacle on top of it. Still further up the canyon are a couple smaller rocks and then, on a slight bulge, is a small rock formation jutting out from chaparral. It