(MARGARETTEN,MARGARETEN,MARGCZETHEN,MARGITA,MARGITTA)
This marker was erected on the grave of our Tzadik (righteous man, but at least literally that could also be a Tzadik of a Chassidic community)
The great sharp-minded Gaon (religious scholar)
HaRav Moshe MARGARETTEN
May the memory of the Tzadik be of a blessing
Son of the Gaon the prominent teacher and
Rabbi Yitzchak Tzvi May the memory of the righteous be of a blessing....*
(remainder of gravestone is illegible in this photo, thus couldn't be translated)

* The honorific "May the memory of the righteous be for blessing" is used after the names of holy rabbis and other saintly people.
http://en.wikipedia.org/wiki/Honorifics_for_the_dead_in_Judaism