Dawan Formation

Geology

Members: unnamed (38), 1A (6), 1B (4), 2 (1), 3 (14), Lower (10), Middle (5), Upper (3)

Lithologies: not reported (8), "siliciclastic" (1), mudstone (16), "shale" (38), sandstone (1), marl (1), lime mudstone (12), grainstone (10), "limestone" (50), "carbonate" (6), chert (4), lignite (1)

Paleoenvironments: marine indet. (5), carbonate indet. (21), shallow subtidal indet. (20), reef, buildup or bioherm (1), deep subtidal shelf (10), offshore shelf (7), offshore indet. (7), slope (8), transition zone/lower shoreface (2), offshore (9), fluvial indet. (1), lacustrine - large (5), lacustrine indet. (3)

Age range: base of the Floian to the top of the Early/Lower Aptian or 477.70000 to 122.46000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Arenigian478.6 - 468.1China (Hubei) (116196 116198 116199 116201 116202 116203 116204 116205 116328 116329 116330 116331)
Dawan478.6 - 468.1China (Guizhou) (7353 7371 7358 7385)
Dawan478.6 - 468.1China (Hubei) (7727)
Dawan478.6 - 468.1China (Hunan) (7691 7692)
Dawan478.6 - 468.1China (Hunan and Hubei) (7717)
Dawan478.6 - 468.1China (YunNan) (7745 7746)
Dawan478.6 - 468.1China (Sichuan) (7659 7661)
Dawan478.6 - 468.1China (JiangSu) (7875 7876 7923 7926 7927 7933 7934 7940)
Dawan478.6 - 468.1China (AnHui) (7829 7854 7855 7861 7862 7863)
Arenig478.6 - 466.0China (Hubei) (4709 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723)
Arenig478.6 - 466.0China (Sichuan) (7648 7649)
Arenig478.6 - 466.0China (Xinjiang) (170835 170836 170837 170838 170839)
Floian477.7 - 470.0China (Hubei) (186113 186114 186115 186116 186117 186118 186119 186120 186121 203694 203695 203696)
Floian - Dapingian477.7 - 467.3China (Hubei) (195231)
Dapingian470.0 - 467.3China (Hubei) (116200 186112 186122 186123 186124 186125 186126 186127 203697 203698 203700 203701)
Darriwilian467.3 - 458.4China (Hubei) (186128 186129 186130 186131 186133)
Darriwilian467.3 - 458.4China (Xinjiang) (80010)
Llanvirn466.0 - 460.9China (Xinjiang) (170840 170841 170842)
Early/Lower Aptian125.45 - 122.46China (Liaoning) (82783 106315 134420 140491 147827 156389 194296)
Aptian125.0 - 113.0China (Liaoning) (92906 117415)