Helms Formation

Geology

Members: unnamed (4)

Lithologies: "limestone" (4)

Paleoenvironments: carbonate indet. (4)

Age range: base of the Chesterian to the top of the Tithonian or 335.40000 to 143.10000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Chesterian335.4 - 323.4USA (Texas) (67678 67679 67680 67681)
Kimmeridgian154.8 - 149.2United Kingdom (158163 158167 158168)
Tithonian149.2 - 143.1United Kingdom (Scotland) (169043)