Suining Formation

{{Infobox rockunit

| name = Suining Formation

| image =

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| type = Geological formation

| age = {{Geological range|Late Jurassic|Early Cretaceous}}

| period = Berriasian

| prilithology = Mudstone

| otherlithology = Sandstone, siltstone

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| region = Asia

| country = China

| coordinates =

| unitof = Sichuan Basin

| subunits =

| underlies = Penglaizhen Formation

| overlies = Upper Shaximiao Formation

| thickness = Several hundred meters

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The Suining Formation ({{Lang-zh|s=遂宁组|t=遂寧組|p=Suìníng Zǔ}}) is a geological formation in China whose strata date back to the Early Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. A 2019 paper shows zircon dating of the Suining Formation with a much younger age for the classically thought of Late Jurassic formation; the average age of the dating being roughly 114 myo or late upper Aptian.{{cite journal |last1=Wang |first1=Jun |last2=Norell |first2=Mark A. |last3=Pei |first3=Rui |last4=Ye |first4=Yong |last5=Chang |first5=Su-Chin |title=Surprisingly young age for the mamenchisaurid sauropods in South China |journal=Cretaceous Research |date=July 2019 |volume=104 |page=104176 |doi=10.1016/j.cretres.2019.07.006 |bibcode=2019CrRes.10404176W }}