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Our Galaxy is thought to have undergone an active evolutionary historydominated by star formation, the accretion of cold gas, and, in particular,mergers up to 10 gigayear ago. The stellar halo reveals rich fossil evidence ofthese interactions in the form of stellar streams, substructures, andchemically distinct stellar components. The impact of dwarf galaxy mergers onthe content and morphology of the Galactic disk is still being explored. Recentstudies have identified kinematically distinct stellar substructures and movinggroups, which may have extragalactic origin. However, there is mountingevidence that stellar overdensities at the outer disk/halo interface could havebeen caused by the interaction of a dwarf galaxy with the disk. Here we reportdetailed spectroscopic analysis of 14 stars drawn from two stellaroverdensities, each lying about 5 kiloparsecs above and below the Galacticplane - locations suggestive of association with the stellar halo. However, wefind that the chemical compositions of these stars are almost identical, bothwithin and between these groups, and closely match the abundance patterns ofthe Milky Way disk stars. This study hence provides compelling evidence thatthese stars originate from the disk and the overdensities they are part of werecreated by tidal interactions of the disk with passing or merging dwarfgalaxies.

Two chemically similar stellar overdensities on opposite sides of the plane of the Galaxy