Heath Formation

Geology

Group: Big Snowy

Members: unnamed (37), Bear Gulch (24), Bear Gulch Limestone (1)

Lithologies: not reported (5), claystone (2), "shale" (25), siltstone (5), sandstone (2), lime mudstone (2), "limestone" (44)

Paleoenvironments: marine indet. (4), shallow subtidal indet. (2), open shallow subtidal (5), lagoonal/restricted shallow subtidal (19), basinal (siliceous) (6), estuary/bay (1), lagoonal (1), shoreface (2), offshore (31)

Age range: base of the Stage 3 to the top of the Late/Upper Oligocene or 521.00000 to 23.04000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Early/Lower Cambrian538.8 - 506.5Australia (South Australia) (190396 190397 190398 190399 190401)
Stage 3521.0 - 514.5Australia (South Australia) (190400)
Chesterian335.4 - 323.4USA (Montana) (577 91049 136169 157238 218839 236627)
Serpukhovian330.3 - 323.4USA (Montana) (5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 154744 157307 157320)
Arnsbergian326.9 - 323.6USA (Montana) (90681 116654 116655 116656 116657 116658 116659 116660 116762 116763 116764 130890 226838 227056 227060 227061 227064 227065 227066 232617 232618 232644)
Middle Bathonian168.2 - 165.3North Atlantic (35299)
Ypresian56.0 - 48.07United Kingdom (England) (38868)
Late/Upper Oligocene27.3 - 23.04Peru (Piura) (64559 64566)
Late/Upper Oligocene27.3 - 23.04Peru (93761)