Lower Mb. Member
Geology
Formation: Poleta
Lithologies: "siliciclastic" (1), "shale" (6), siltstone (2), sandstone (2), grainstone (1), "limestone" (1)
Paleoenvironments: shallow subtidal indet. (8), reef, buildup or bioherm (1), offshore indet. (2)
Age range: Montezuman or 520.00000 to 515.30000 Ma