Marshall, 1947 Otus scops June 28 Marine Ridge, Eldorado Co., Calif. white firs: Hermit thrush singing all thru this co. Here was good soil on flat gad. On steep places became rocky & very poor forest of Yellow Pine, Incense Cedar. Drove to Jackson (meadow), S fork, Middle Fork, Nth Fork of Silver Creek. Between creeks was rolling country of terrendous virgin forest no firs, no logging - great Yellow Pines, Sugar Pines, White Firs, Incense Cedars, an occasional douglas fir (very rare). As the river valleys were reached however, this forest would give way abruptly to lodgepole pine & scampy Jeffrey Pine forest - a few aspens. Thus the jeffrey pine would be found in the eroded granite slopes of the stream valley, of yellow pine among the giants of the rolling co. away from stream valleys. Seems purely an adaptive factor influencing the shift yellow pine (good soil) -> Jeffrey Pine (grants) As the owls in P.M: Camped at public camp Nth th Silver Creek. Camp in Lodgepole & June 29 Jeffrey Pine by creek - few birds compared