Yes. I found an old mine dump once that had no shaft or adit above it (obviously had been filled in). Under some brush on the hillside was a heart-shaped rock that had obviously been chiseled into shape. Tool marks proved it. Below the heart were four or five flat rocks set in a sort of pattern that reminded me of a fish profile when I first saw it.
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Another example. I found an old filled-in shaft that someone attempted to clear in a "treasure legend canyon." They had removed something like 15-20' of rocks and dirt, as I remember, when they apparently quit. I guess it became too difficult raising the muck to the surface. On the ground right next to the shaft opening was about a 50-pound heart-shaped flat rock where someone had hammered out a v-shaped segment to form the two lobes.
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As you know, dog, I don't believe in coincidences, so I assumed that these two hearts were some sort of markers. I would not have thought too much about them except that they were both obviously man-shaped.