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[[underlined]] Summer Lake [[/underined]]

[[underlined]] June 20 [[/underlined]] Rained part of night & till 10 [[strikethrough]] ocl [[/strikethrough]] A.M. and again by squalls all day.

Got a late start. Came through Paisley and over the low, flat divide to Summer Lake & camped at south end of lake. Came about 17 miles, camped early & set traps.

Followed up the west side of Chewaucan Marsh to Paisley and then climbed a ridge 150 feet above the river and followed across the mesa about 7 miles to Summer Lake. The real divide is lower than where the road runs and is about 100 feet higher than the lakes it separates. It is a wide, flat mesa covered with the same Sonoran species found in both valley bottoms & forms no zonal barrier. [[strikethrough]] Old [[/strikethrough]]

Old shore lines show along both valleys above the dividing ridge, showing that one lake filled them ^[[insertion]] both [[/insertion]] at one time.

Summer Lake is both salt & alkaline. The shore is filthy with green slime & a swarm of flies breed in the water. Salt plants grow along the shore, and Atriplex & Sarcobatus are abundant. Sonoran plants predominate.

[[underlined]] Spermophilus beldingi [[/underlined]] were common all up the west side of Chewaucan Marsh to Paisley, but none were seen after crossing the Chewaucan River. [[underlined]] Spermophilus mollis [[/underlined]] were noticed soon after we crossed the river at Paisley & were abundant to camp. Holes of probably Perodipus were seen. Tracks were all rained out.

Aneroid readings unreliable. 4500 at starting, 4300 at Paisley, 4450 on divide, 4175 at camp, 4100 at Summer Lake.