The results of a photometric survey of the Fornax dwarf spheroidal galaxy are presented herein .
Accurate photometry in two colours ( V and I ) was collected over a 10 deg ^ { 2 } area centred on the Fornax system with the aim of searching for extra-tidal structure .
The data were complete to a magnitude of V = 20 , or approximately one magnitude brighter than the Fornax red clump stars .
Stars were selected with a colour and magnitude lying near the Fornax red giant branch , thereby reducing contamination from the field star population .
We were thus able to probe the outer structure of this dwarf galaxy .
Immediately visible was a shell-like structure located 1.3 degrees NW from the centre of Fornax , approximately 30 arcmin beyond the nominal tidal radius at this position angle .
We have measured the absolute visual magnitude of this feature to be M _ { V } \sim - 7 .
The feature is aligned with a previously reported shell ( age \sim 2 Gyr ) located near the core radius of Fornax .
A statistical analysis of the extra-tidal stellar distribution further revealed two lobes situated on the Fornax minor axis which are aligned with the two shell-like features .
The two-lobed structure combined with the two shells provide strong evidence that Fornax has experienced a merger event in the relatively recent past .