The Río Cachirí Group (, PZc) is a geological group of the Cesar-Ranchería Basin, Colombia and the Serranía del Perijá of the northernmost Colombian and Venezuelan Andes. The group of shales, sandstones and limestones is of Devonian age and has a maximum thickness in the Venezuelan section of . The group contains abundant fauna; crinoids, bryozoa, brachiopods and molluscs have been found in the group.