Tanyard Formation
Geology
Group: Ellenburger
Members: unnamed (2), Staendebach (3), Threadgill (4)
Lithologies: lime mudstone (2), grainstone (1), "limestone" (5), chert (2)
Paleoenvironments: carbonate indet. (4), peritidal (1), shallow subtidal indet. (3), lagoonal/restricted shallow subtidal (1)
Age range: Gasconadian or 486.85000 to 477.10000 Ma