mounds stood up rather prominently, about 5 feet high (a few of them higher) in a pasture that had been used for corn last year. Pieces of tallk and a few little ears lying around, plus grazed green grass, weeds, thistles, etc., plus 50 thick steers. The hills were about 20 ft across, not very evenly spaced. The soil was very light, no evidence of a stoney foundation (we haven't seen a stone for 200 miles), and no rocks in the few low road cuts. Each mound had one or more burrows on it, not necessarily on top. The burrows were big enough to put your hand or even arm in. Some had been dug from the outside and were flat. Others were arm deep or more. They looked mostly like armwells dragings, I could find no solid evidence of true - teras. They covered an area maybe 10 acres. just on the north side of the Rio Grande, on the west side of the road, was another set of green-covered mounds, at least 5 ft tall, among scattered thin trees. Didn't stop to examine these.