Dear Fred,
There are four Szentmartons in Mures County...
- Dicsoszentmarton / Tarnaveni
- Korodszentmarton / Coroisanmartin
- Mezoszentmarton / Sanmartinu de Campie
- Nyaradszentmarton / Mitresti
The last three places has no Catholic communities, so the must probable place of your Csonkas is Dicsoszentmarton / Tarnaveni / Sankt-Martin (Marteskirch or Mierteskirch).
Unfortunatelly, no church records in the Mures County State Archive - in lucky case, they are kept by the local Parish Office.
Janos - from Transilvania
www.erdelygen.uw.hu