Daye Formation

{{Infobox rockunit

| name = Daye Formation

| image =

| caption =

| type = Geological formation

| age = Induan - early Olenekian, {{Fossil range|252.3|250.7}}

| period = Early Triassic

| prilithology = Shale, limestone

| region = south China

| country = China

| underlies =

| thickness = ~10 meters

| coordinates =

| paleocoordinates =

| map = {{Location map+ | China

| relief = 1

| width = 250

| float = center

| places = {{Location map~ | China

| lat_deg = 26.50

| lon_deg = 106.838

| mark = Dark Green 004040 pog.svg

| marksize = 10

}}

}}

}}

{{distinguish|Daye Group}}

The Daye Formation is a geologic formation in South China, dating from the Induan up to the early Olenekian (early Triassic).{{cite journal |last1=Gao,M. |first1=Mei, M. |title=Giant Induan oolite: A case study from the Lower Triassic Daye Formation in the western Hubei Province, South China |journal=Geoscience Frontiers |date=November 2012 |volume=3 |issue=6 |pages=843–851 |doi=10.1016/j.gsf.2011.11.017 |bibcode=2012GeoFr...3..843M |doi-access=free }}{{cite journal |last1=Yang, T. |first1=Wu, H. |title=Milankovitch and sub-Milankovitch cycles of the early Triassic Daye Formation, South China and their geochronological and paleoclimatic implications |journal=Gondwana Research |date=December 16, 2011 |volume=22 |issue=2 |pages=748–759 |doi=10.1016/j.gr.2011.12.003 |url=https://www.sciencedirect.com/science/article/abs/pii/S1342937X11003492 |access-date=14 March 2023|url-access=subscription }} It is of interest as it spans the period immediately after the Permian-Triassic extinction event, the most severe mass extinction known in Earth history.

The Daye Formation hosts the Guiyang biota, as of 2023 the earliest known Mesozoic lagerstätte.{{Cite journal|last1=Dai |first1=X. |last2=Davies |first2=J. H. F. L. |last3=Yuan |first3=Z. |last4=Brayard |first4=A. |last5=Ovtcharova |first5=M. |last6=Xu |first6=G. |last7=Liu |first7=X. |last8=Smith |first8=C. P. A. |last9=Schweitzer |first9=C. E. |last10=Li |first10=M. |last11=Perrot |first11=M. G. |last12=Jiang |first12=S. |last13=Miao |first13=L. |last14=Cao |first14=Y. |last15=Yan |first15=J. |last16=Bai |first16=R. |last17=Wang |first17=F. |last18=Guo |first18=W. |last19=Song |first19=H. |last20=Tian |first20=L. |last21=Dal Corso |first21=J. |last22=Liu |first22=Y. |last23=Chu |first23=D. |last24=Song |first24=H. |title=A Mesozoic fossil lagerstätte from 250.8 million years ago shows a modern-type marine ecosystem |year=2023 |journal=Science |volume=379 |issue=6632 |pages=567–572 |doi=10.1126/science.adf1622 |pmid=36758082 |bibcode=2023Sci...379..567D |s2cid=256697946 |url=https://www.science.org/doi/10.1126/science.adf1622 }}