Yes, it is very clear, "St. Marks, La." is how it is written.
I'm wondering if they meant "Marksville, La."?
Although, it could be that St Marks, Louisiana was in exsistance when she was born and no longer, right? If so, maybe I can find it on an old map of that time period.
I'll keep it in my list of places to find with Staffords Landing, Catahoula Parish, Louisiana.