We got out in the sunshine part of the day, and wandered the passageways of Oakland Cemetery. We found the African-American and the Jewish sections, which I had never entered before. The potter’s field area is, I think, the lowest part, and after the recent rains, pretty damp (aka saturated).
I don’t know the symbolism of the shell. Or at least, I never heard that angels sleep in bivalve shells. I have read that scallop shells are fertility symbols and, in Christianity, represent St James and St Augustine. Those three, with angels, seems both powerful and a mixed message.