San Angelo - Alpine, April 2-1926 Left San Angelo at 7.30 A.M. and jumped over Permian to a Comanchean area that begins with sands and then the living Frederick key. The thickness is small. For the west is more Permian. Passed through Herwood - Barnhart on the Grand R. R. to Big Lake. The Big Lake oil field is about 14 miles further west. This field was discovered by a wild cat, and in 1920 there were about 30 wells; now there are 90. The field is about 3 square miles, and is now yielding 30,000 barrels daily, long as present the greatest producing field in Texas. The wells are down between 2900 and 3100 feet. On top is 300 of Comanchean, 300 of Triassic and the rest is red beds Permian overlying the oil in liq and solids. One well is down 6000 feet and is believed to be still in the Permian; below are Hard Shales, below the oil zone. Dellards visited with Graves for 2 hours, had lunch here. In this region the general dip of Permian is to the N.W. The oil dome has a size of about 100 feet on a gentle western slope and a steeper eastern one. Thrusting from the E. See Dellards paper soon to be published in A.A.P.G. Bulletin. Crossed Pecos River at 1.35 P.M. The river is meandered at my 25 feet. Behave about 30 miles to get to Fort Stockton. Near there are many outcrops of Comanche.