The Pemberton Hill-Lewisville (T-2) terrace deposits of the Trinity River in Dallas and Denton Counties are divided into four consecutive members. Sixty-three vertebrates, 32 mollusks, and several insects and plants were collected from 3 members and are discussed in the report. The terrace deposits are tentatively referred to as the Sangamon interglacial on the basis of two radiocarbon dates in excess of 3700 years BP and on the association of the giant bison with a typical interglacial fauna. Other Trinity River terraces and local archeology are described and stratigraphic and faunal relationships with other well-known fossil localities in Texas, Oklahoma, and Kansas are suggested.