This study uses unsupervised seismic facies classification techniques on a 3D seismic volume from the Lower Strawn Formation in the Bend Arch-Fort Worth Basin of Texas to differentiate sand bodies and delineate architectural elements within the target formation. The authors extract attributes from the seismic data after conditioning and perform an impedance inversion. They classify the data using k-means clustering, self-organizing maps, and principal component analysis and find that while k-means highlights potential channel and bar features, self-organizing maps and principal component analysis better discriminate more subtle facies changes in specific areas. The results provide insight into the depositional history and 3D seismic expression of the turbidite/submarine fan complex within the Lower Straw