Defined by Gordon Willey in his 1949 report. Directly associated with Alligator Bayou Stamped. The difference between these two types is that the Alligator Bayou Stamped has rocker stamping associated with bold incised lines, while Basin Bayou Incised has just the bold lines without the rocker stamping. Named after the Basin Bayou sites, 8Wl13 and 8Wl14 in Walton County, Florida.
Bold incised lines on sand-tempered pottery. Rectilinear and curvilinear motifs are present. Combinations of both motifs on the same vessel are represented. The lines average 2 to 3 millimeters in width. Arrangements of parallel, diagonal lines, concentric rectangles, concentric triangles, meandering scrolls, and complex and highly stylized life figures make up the designs. Bird designs are also present. These designs frequently depict wings, tails, heads, and other bird parts on different sides of these vessels. Deep hemiconical terminal punctuations mark the ends or junctures of the incised lines. The rims of these vessels are offset from area of decoration by a single bordering incised line. Known vessel forms include flattened-globular bowls and straight-sided beakers. Rims are incurved with and without exterior marginal folds or thickenings, straight or slightly out-slanted, and lack a marginal fold. Lips are scalloped or notched, round-flattened, or round-pointed.