The burial offerings at Gahagan included ornate pottery, beautifully flaked stone knives (called Gahagan blades), batches of choice flint arrow points, long stemmed or figurine pipes of clay and stone, copper-plated ear ornaments, sheet copper plaques, copper hand effigies, long-nosed god copper masks, polished greenstone celts (some spade-shaped), bone hairpins, and shell beads or ornaments. All of these are unusual for this area and show that the early Caddos had widespread trade channels for these esoteric objects and materials. The sources are as distant as the Gulf coast, the Kiamichi Mountains of Oklahoma, the central Texas plateau, Tennessee or Kentucky, and, possibly, the Great Lakes area. [Illustration: Frog and human effigy stone pipes and polished and engraved pottery vessel made about A.D. 1050. Artifacts from the Gahagan Mound site, Red River Parish, Louisiana.] The second Caddo site where high ceremonialism existed is at Mounds Plantation, on an old Red River channel just north of Shreveport. An oval plaza, more than 600 yards in length and 200 yards in width (about twenty-five acres), is surrounded by seven mounds of varying sizes, with two smaller mounds at some distance. It was first described by Clarence B. Moore (1912), then studied by surface collections and limited excavations by Ralph R. McKinney, Robert Plants, and Clarence H. Webb, with assistance of friends (Webb and McKinney 1975). At least four culture periods were indicated by pottery sherds. Excavations proved that Coles Creek people established and laid out the site, probably constructing at least four of the mounds around the plaza. A flat mound on the northwest corner, started by these people, was built higher by the early Caddos in what seems to have been a period of rapid culture change. The mound may have been the location of an arbor or lodge where food was prepared and served during festivals or ceremonies held in the adjoining plaza. At the southeast end of the plaza, the Coles Creek people prepared a large burial pit, measuring sixteen by fourteen feet, in which they placed ten adult or adolescent burials in two parallel rows. Offerings found by the investigators were limited to flint arrow points, bone pins, smoothing stones, traces of copper-plated ear ornaments, and ankle rattles of tortoise shells filled with pebbles. A small mound had been built over this pit, and into this mound later Coles Creek burials had been placed.