This tree stump was encased in deposits of the Electron lahar and excavated in 1993 during construction of a housing subdivision in the Puyallup River valley. Clearly, an old growth forest grew on the valley floor when the lahar swept from Mount Rainier abtou 500 years ago. The lahar deposit is about 5 m thick at this location, a few kilometers downstream from Orting, Washington. Mount Rainier is visible in the distance.

Like most lahars generated by large landslides, the Electron deposit is rich in clay-sized particles (6-11 percent). The most distinctive rock in the deposit is a scoriaceous, black andesite lava, which is as large as 1.5 m in diameter. The largest boulders, however, are a reddish-brown breccia as large as about 10 m in diameter. Both rock types were derived from Mount Rainier's cone.