Structurally complex, heterogeneous, tide-dominated deltaic reservoirs in the Lower Misoa Formation (lower Eocene C members) in the LL-652 area of Lagunillas field in the Maracaibo Basin, Venezuela, have produced 166 million stock-tank barrels (MMSTB) of oil but have a low recovery efficiency of 22 percent. These reservoirs will contain more than 900 MMSTB of unrecovered mobile oil when primary recovery operations at the current 80-acre well spacing end.

In his memoirs, Virgil Barnes recounts highlights of his life and career in entertaining detail: his childhood in Washington; his worldwide travels in search of tektites, accompanied by his wife, Milla; and his geological mapping and other research during his 58 years at the Bureau of Economic Geology and in retirement. Barnes began his long and prolific career at the Bureau in 1935. He directed the mapping project that resulted in 38 Geologic Atlas of Texas sheets and the four-quadrant geologic map of the entire state of Texas.