Journal Hafner, M.S. 1976 Sommerville, Contra Costa Co., California 12 June 1400 John and Patti Hafner and Dacey, Emily and I drove via Kirker Pass Rd to Pittsburg. We turned East then South past the Antioch Dump to the historic mining town of Sommerville. Very warm day, few clouds. We hiked up a small hill to the SW of the old mine shaft. Our main interest was in determining whether or not Perognathus inornatus and/or Dipodomys heermanni berkeleyensis occur in this area. The vegetation consisted of Artemisia, Salvia and some Cistostephylus - (I wasn't able to identify a few of the shrubs). We saw little evidence of Perognathus in the hilly chaparral areas and no evidence of Dipodomys. We returned to the area of the mine shaft where we noted much evidence of what appeared to Perognathus diggings in mounds of mine tailings just about 25 meters from the mine entrance (due west). There was no vegetation on the substrate of the mounds - the soil was very fine and almost powdery. - We decided to return at a later date to attempt to collect these alleged Perognathus. 1700- We got a drink of cool water from the park fountain and returned home.