The Mulichinco Formation is a geological formation in Argentina. It is Valanginian in age and is predominantly terrestrial, being deposited at a time of marine regression in the Neuquén Basin, and predominantly consists of siliciclastic rocks.

Dinosaur remains have been found in the formation, including those of the dicraeosaurid Pilmatueia and carcharodontosaurid Lajasvenator. Flora recovered from the formation includes the tree fern Tempskya dernbachii and horsetail Equisetites.

• Coria, Rodolfo A.; Currie, Philip J.; Ortega, Francisco; Baiano, Mattia A. (2019), "An Early Cretaceous, medium-sized carcharodontosaurid theropod (Dinosauria, Saurischia) from the Mulichinco Formation (upper Valanginian), Neuquén Province, Patagonia, Argentina", Cretaceous Research, 111: 104319, doi:10.1016/j.cretres.2019.104319
• Coria, Rodolfo A.; Windholz, Guillermo J.; Ortega, Francisco; Currie, Philip J. (2018), "A new dicraeosaurid sauropod from the Lower Cretaceous (Mulichinco Formation, Valanginian, Neuquén Basin) of Argentina", Cretaceous Research, 93: 33–48, Bibcode:2019CrRes..93...33C, doi:10.1016/j.cretres.2018.08.019doi:10.1016/j.cretres.2018.08.019
• Gnaedinger, S.; Coria, R. A.; Koppelhus, E.; Casadío, S.; Tunik, M.; Currie, P. (2017), "First Lower Cretaceous record of Podocarpaceae wood associated with dinosaur remains from Patagonia, Neuquén Province, Argentina", Cretaceous Research, 78: 228–239, Bibcode:2017CrRes..78..228G, doi:10.1016/j.cretres.2017.06.014, hdl:11336/30408
• Schwarz, Ernesto; Howell, John A. (2005), "Sedimentary evolution and depositional architecture of a lowstand sequence set: the Lower Cretaceous Mulichinco Formation, Neuquén Basin, Argentina", Geological Society, London, Special Publications, 252 (1): 109–138, Bibcode:2005GSLSP.252..109S, doi:10.1144/GSL.SP.2005.252.01.06doi:10.1144/GSL.SP.2005.252.01.06Bibcode:2005GSLSP.252..109SISSN 0305-8719