[Therion] Metapost code for pendant and stromatolite symbols

Hello everyone - I need to put some pendants and stromatolites on a map. I do not see these symbols in Therion. Has anyone already done the Metapost code for them? The symbol for a pendant looks sort of like the Greek letter upsilon, except it has rounded corners instead of sharp. Attached is a bit of the sketch I am working from which shows the pendant symbol. Thanks - Bill Gee