Coral fossils including Procyclolites jomdaensis Deng et Zhang，Submargarosmilia cf. riwoqeensis Deng et Zhang， Distichophyllia zangdongensis sp. nov.，Distichophyllia tenuise (Deng et Zhang)，Stylophyllopsis ? sp. and conodont fossils including Epigondolella postera, E.bidentata，E.abneptis and Paragondolella sp. are found at the Yawa section. These newly-found fossils indicate that the strata at the Yawa section is rather the Late Triassic Norian than the Late Jurassic to the Early Cretaceous in age. Therefore, the strata at the Yawa section is renamed to be the Mailonggang Formation instead of the previous Mamuxia Formation. The ‘Mamuxia Formation’ at the Yawa section could not be regarded as the representative of the Late Jurassic to the Early Cretaceous strata in the Longgeer-Nanmulin substrata region in south Gangdise. The discovery of the Mailonggang Formation at the Yawa section adds more evidence that the Gangdise is Tethys sea rather than Gangdise Oldland during the Late Triassic.