They are directly under the projecting stone.The sun sets at the same position on the horizon twice every year, except for summer and winter solstices. There are 54 days from June 21 to August 13, and from June 21 back to April 28. On April 28, the pattern of sunlight in Miantonomi's Cave would be similar to that on August 13, but there would be no foliage blocking the sunlight. First I returned on April 26. The sky was sunny when I left my home, and by the time I reached Miantonomi's Cave, it was obvious that Nature was not completely cooperative. This experience made me appreciate the difficulties of using sun patterns for determining important dates.
It is easier to get a feeling for these events by watching the time lapse video made 4/26/2013. Clouds kept going past the sun, making the sun daggers vanish and reappear, but the final sequence is clear. The video made 4/28/2013 shows the sequence of the sun dagger touching the dimples and the second sun dagger appearing and moving up the wall until the clouds blocked the light. The first sun dagger seems to disappear briefly after touching the second dimple. This also happened on 8/13/2012. This was not caused by passing clouds, but probably by trees outside the cave.
This is essentially the same pattern as on 8/13/2012, except then the foliage kept diffusing the light, instead of clouds. I suspect there are two marks for equinox, and three dimples for August 13, to allow for estimation of days to these events, in case of cloudiness.
I always notice something new whenever I return to the cave, something revealed by changes in light or season. The projecting stone resembles an animal head from the side. This time I noticed something shiny along the line for the "mouth". It even looked like there was a drop of water at the end of the stone. The shiny area felt smooth, as if there were crystals there.
Only 50 more days until summer solstice....