Mars as the parent body of the CI carbonaceous chondrites

The hypothesis that the CI meteorites have an origin on southern Mars is presented. This hypothesis is based on the CI containing a Martian pattern of oxygen isotopes and mineralogy indicative of deposition by liquid water, as found in several Martian meteorites. Other correlation's are discussed. A model of the formation of CI meteorites as being late planetary accretion material that was concentrated as bottom sediment of lakes or seas in early Mars history is proposed. The model accounts for the similarity to solar composition of the CIs because during the late accretion on Mars the upper regolith would receive material that was Martian in isotopic abundance but primordial in composition.