(2) Upper Cambrian (Brester Formation). Thickness unknown. 1 Occurs 5 to 30 miles south of Marathon Dark colored ds. and shales (35). 2 Thickness 100 to 200' Has a few tracks, and 1 trillbite (81). Fauna like Nevada. Ordovician (Marathon series). Lower Ord., dark ds. and sh., at least 300' (300-500) Fossils 100' below top. Ordovician fossils (see @ 82). Bl. and green and blue sh. 300' no fossils Dark then redded lie. 130'. L. Ord. Bellmontum (2) 84. Green, gray and Hard sh., and brown ds. 100' no fossils. (Middle Ord., yellowish-brown sh. and thin gray lie. 375'. Has fossils - Earliest Trenton (2) 85). The above sequence is not found in one place; uncertain. Chaparillos Chief Lower part = Mid. Ord. Litho Chief, has fossils. 400' See @ p. 89 for fauna. Rich in fossils. Trenton - vide Upper part = Fernvale (Rich.) 400' 300' Chief and gray lie. Thin end. See @ p. 89. Sorts Gonda S.E. of Marathon. Deronian? Catallos Horaculite. No fossils. Whid - Oistany, 90' In @ cap. 93, Has radiolarians (101), 10% to 70% found. Are they really radiolarians at all?