Hello,
I can't find a birth record in Bordeaux for Jean Auguste MARCON, born circa 1849 to Jacques MARCON and Marguerite.
On July 30th 1867 (Bordeaux, section 3) marriage of Jean DUFOURCQ and Catherine MARCON, daughter of Jacques MARCON and Marguerite EYMAS (they are both alive in Bourg-sur-Gironde). Jacques MARCON, born around 1805, was a shoemaker.