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We perform a detailed photometric study of the stellar populations in aGalactic Field at l = 232, b = -6 in the Canis Major (CMa) constellation. Wepresent the first U,B,V,I photometry of the old open cluster Auner1 anddetermine it to be 3.25 Gyr old and to lie at 8.9 kpc from the Sun. In thebackground of the cluster, at more than 9 kpc, we detect a young populationmost probably associated to the Norma Cygnus spiral arm. Furthermore, we detectthe signature of an older population and identify its Turn Off and Red GiantBranch. This population is found to have a mean age of 7 Gyrs and a meanmetallicity of Z = 0.006 . We reconstruct the geometry of the stellardistribution and argue that this older population - often associated to theCanis Major {\it galaxy}- belongs in fact to the warped old thin/thick diskcomponent along this line of sight.

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Photometry of a Galactic Field at<i>l</i> = 232°,<i>b</i> = -6°: The Old Open Cluster Auner 1, the Norma-Cygnus Spiral Arm, and the Signature of the Warped Galactic Thick Disk

Photometry of a Galactic Field atl = 232°,b = -6°: The Old Open Cluster Auner 1, the Norma-Cygnus Spiral Arm, and the Signature of the Warped Galactic Thick Disk