They could be considered recent I found them since this summer after all the rain in the spring. the area is about 75 feet X 250 feet it is a small section in the corner of our property i am going to clear some more when I have the time. i have also found a small cigar box of snapped off bases.
Nice finds, and nice to see that colored flint instead of ' root beer '. Your doing a great job of finding, I've done some surfacing around Amistad. The soil still varies from thin to nil !! I eventually had some success with a common leaf rake, it's azazing how much a 1/16 of an inch of dust can hide !!
You've found some nice points there Leonard. SH had a good idea with the garden rake, it's worked for me before. He's right, you might be surprised what's just under the surface. It's certainly worth a try.