All right !! Now I got some good opinions on a contraversial subject. I think there are certain benefits to power equipment on arch sites like, take off the top couple of feet of sand or clay. Also certain point types and blades are much hardier just as they were made thicker or more rugged. Not damaged as easily as the fine stuff. You can't tell me that needle tips and delicate ears and power equipment are EVER a good mix...A wiggle pick and concrete camp bottom are tricky enough. When you see bone beads and shell Gorgets come out two or three feet down mixed with rock you thank the lord you didn't stick your pick through one or find the pieces on a screen table. My point was not how many you find by moving acres of dirt. Some areas along the Nueces should have been designated (hand dig only) IMO but like you said Hal there's a ranchette on it now... If your in no hurry and you have access that is not going away in the near future, don't let people pot hole it. Study it as you pick it apart learn the layers and make an informed decision to use power equipmet to clear the top or clean out back dirt to expose un-dug areas.
Filling a frame is fun but the knowledge of how the Natives functioned is priceless.
Be a guardian to the areas you have access to and you will be rewarded.