Dawan Formation

Geology

Members: unnamed (68), 1A (6), 1B (4), 2 (1), 3 (14), Lower (10), Middle (5), Upper (3)

Lithologies: not reported (8), "siliciclastic" (1), mudstone (16), "shale" (55), sandstone (1), marl (1), lime mudstone (12), grainstone (10), "limestone" (68), "carbonate" (6), chert (4), lignite (1)

Paleoenvironments: marine indet. (17), carbonate indet. (39), 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 (9), lacustrine indet. (4)

Age range: base of the Floian to the top of the Late/Upper Barremian or 477.70000 to 125.45000 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 (AnHui) (7829 7854 7855 7861 7862 7863)
Dawan478.6 - 468.1China (Hubei) (7727)
Dawan478.6 - 468.1China (Guizhou) (7353 7371 7358 7385)
Dawan478.6 - 468.1China (Sichuan) (7659 7661)
Dawan478.6 - 468.1China (Hunan and Hubei) (7717)
Dawan478.6 - 468.1China (Hunan) (7691 7692)
Dawan478.6 - 468.1China (JiangSu) (7875 7876 7923 7926 7927 7933 7934 7940)
Dawan478.6 - 468.1China (YunNan) (7745 7746)
Arenig478.6 - 466.0China (Xinjiang) (170835 170836 170837 170838 170839)
Arenig478.6 - 466.0China (Hubei) (4709 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723)
Arenig478.6 - 466.0China (Sichuan) (7648 7649)
Floian477.7 - 470.0China (Hubei) (186113 186114 186115 186116 186117 186118 186119 186120 186121 203694 203695 203696 221196 221197 221198 221199 221200 221201 221202 221203 221204 221205 221206 221207 221208 221209 221210 221211 221212 221213 221214 221215 221216 221217 221218)
Floian - Dapingian477.7 - 467.3China (Hubei) (195231)
Dapingian470.0 - 467.3China (Hubei) (116200 186112 186122 186123 186124 186125 186126 186127 203697 203698 203700 203701 221219 221220 221221 221222 221223 221224 221225)
Llanvirn468.0 - 458.4China (Xinjiang) (170840 170841 170842)
Darriwilian467.3 - 458.4China (Hubei) (186128 186129 186130 186131 186133)
Darriwilian467.3 - 458.4China (Xinjiang) (80010)
Late/Upper Barremian130.0 - 125.45China (Liaoning) (106315 140491 147827 156389 194296 226159 226160 226161 232793)
Late/Upper Barremian - Early/Lower Aptian130.0 - 122.46China (Liaoning) (13937 92906 82783 117415 134420)