Coeymans Formation
Geology
Group: Helderberg
Members: unnamed (13), Dayville (5), Deansboro (3), Ravena (1)
Lithologies: grainstone (4), "reef rocks" (11), "limestone" (7)
Paleoenvironments: carbonate indet. (2), shallow subtidal indet. (8), open shallow subtidal (1), reef, buildup or bioherm (11)
Age range: Lochkovian or 419.62000 to 413.02000 Ma