... a featheredge to 10 feet. The main part of the limestone contains fusulinids, brachiopods, and algae (Moore and others, 1951, p. 72). Phosphatic nodules that average about one inch in diameter lie within depressions on the uneven surface of the Haskell limestone at the base of the Robbins shale. The nodules...

... ) or as a transgressive-lag deposit ( Archer et al., 1994b ). The overlying, marine Vinland Shale, Haskell Limestone, and Robbins Shale record continued marine inundation in the study area; the basal 30 cm of the Robbins Shale contains a condensed section with abundant phosphatic nodules and fossils ( Miller...

... to include the Haskell Limestone Member, Robbins Shale Member, Ireland Sandstone Member, Amazonia Limestone Member, and a member to be named in the forthcoming report. The Missourian-Virgilian boundary is placed at the base of the redefined Douglas Group. Fig. 3. —Reclassification of Douglas...

... to 0.2 m above the base, and as calcitic casts in the middle part, 1.1 to 1.9 m above the base. The Little Pawnee Shale immediately overlies a thin, 0.1-m-thick dark skeletal packstone-wackestone unit, the Haskell Limestone Member, which contains the provisional Missourian-Virgilian Stage boundary (see...

... be shifted upward to the base of the Haskell Limestone in the middle of the Douglas Group to coincide with the lowest occurrence of the conodont Streptognathodus zethus. In contrast, the placement of the Virgilian-Wolfcampian boundary (i.e., the traditional Pennsylvanian-Permian boundary) has had a long...

... (1966) , Frost (1975) ; Wyandotte— Crowley (1969) ; Plattsburg— Harbaugh (1959 ; Harbaugh et al, 1965); Stanton and South Bend (separate cycles)— Heckel (1975a , b); Haskell (includes overlying Robbins shale)— Ball (1964 , p. 120-140); Oread— Troell (1969) , Toomey (1964 , 1969a ), Evans (1967...