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Many aspects of planet formation are controlled by the amount of gasremaining in the natal protoplanetary disk (PPDs). Infrared observations showthat PPDs undergo a transition stage at several Myr, during which gas densitiesare reduced. Our Solar System would have experienced such a stage. However,there is currently no data that provides insight into this crucial time in ourPPD's evolution. We show that the Isheyevo meteorite contains the firstdefinitive evidence for a transition disk stage in our Solar System. Isheyevobelongs to a class of metal-rich meteorites whose components have been dated atalmost 5 Myr after the first solids in the Solar System, and exhibits uniquesedimentary layers that imply formation through gentle sedimentation. We showthat such layering can occur via gentle sweep-up of material found in theimpact plume resulting from the collision of two planetesimals. Such sweep-uprequires gas densities consistent with observed transition disks. As such,Isheyevo presents the first evidence of our own transition disk and providesnew constraints on the evolution of our solar nebula.

New insight into the Solar System's transition disk phase provided by the unusual meteorite Isheyevo