I was almost immediately rewarded by finding a large patch of berries. After further inspection, I determined that the berries were black rasberries. You can tell the difference between a rasberry and blackberry by the way the stem appears after you pick it off the vine. With a rasberry, the stem will remain on the vine, leaving a concave depression within the berry. When blackberries are picked, the entire stem is removed, resulting in a berry that is more uniform in shape.
After finding the rasberries, I got very excited and decided to walk around the entire field to see what else I could find. Tucked beside a grassy path amid some overgrown brush, I found what I believe are blueberries. The bushes were in their flowering stage with clusters of several white cup-like flowers. Honeybees were busy polinating the flowers. Also, the leaf shape and size appears to be consistent with pictures of blueberry bushes. I will keep checking on these bushes to see if berries appear and turn blue...hopefully they do.