Helongshan Formation

Geology

Members: unnamed (17)

Lithologies: claystone (1), mudstone (4), "shale" (1), marl (2), lime mudstone (5), "limestone" (4)

Paleoenvironments: offshore ramp (5), basinal (carbonate) (9), basinal (siliciclastic) (3)

Age range: base of the Griesbachian to the top of the Smithian or 251.90200 to 248.10000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Griesbachian251.902 - 250.5China (Zhejiang) (116323 116324 116325 116326 116327)
Smithian249.9 - 248.1China (Anhui) (114000 117945 149182 149183 149184 149185 149186 149187 149188 149189 150822 150823)