I am descended from Michael Derck (spelling varies). he was married to Maria Elizabeth Dunkelberger, dau of Clement and Anna Maria (Hauer) Dunkelberger. All my info is the same as what you posted except that I have her name as Maria Elizabeth. What do you know about her sister Magdalena? Michael and Elizabeth are in central PA church records for a few years, then we find Michael Derk and his wife Magdalena. ??????