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NGC 2359 is a Wolf-Rayet (W-R) nebula partially bound by a rather dense andwarm molecular cloud. We present the results derived from CO and $^{13}$COfully sampled maps of the molecular material with angular resolutions up to12". We have detected three different velocity components, and determined theirspatial distribution and physical properties. The kinematics, morphology, massand density are clearly stratified with respect to the W-R star. These featuresallow us to learn about the recent evolutionary history of HD 56925, becausethe multiple layers could be associated to several energetic events which haveacted upon the surrounding circumstellar medium. Hence, a careful study of thedifferent shockfronts contain clues in determining the present and pastinteraction of this evolved massive star with its surroundings. From theanalysis of the mass-loss history in massive stars like HD 56925, we suggestthat the multiple layers of shocked molecular gas are likely to be producedduring the earlier LBV phase and/or the actual W-R stage of HD 56925.Comment: Accepted by A&A. 12 pages, 7 figure

Shocked gas layers surrounding the WR nebula NGC 2359