I recently returned to a picnic grove that was active from about 1900-1940. I tried hunting it in 1978 when I bought my first detector. I found nothing but junk and never went back. I went back a couple of weeks ago for the first time since 1978. The grove is almost impossible to search because of the brush and broken limbs from the trees. I have found about 30 coins there in maybe 4 hours. The oldest is 1901 and the newest is 1934. The deepest coins have been about 4 inches. There is a lot of trash but technology has made it much easier to discriminate compared to 1978. Is this common to have shallow old coins in thick groves.