However some workers have regarded the age to be Upper Pennsylvanian
The Cook Ranch Field produces from a very permeable lens of Cook Sand of lower Permian or upper Pennsylvanian
age, occurring at an average depth of 1,300 ft.
scheuchzeri from the Upper Pennsylvanian
of the Appalachian Basin.
Figure 6 shows our reconstruction of upper Pennsylvanian depositional model in the study area.
This study contributes toward the understanding of the depositional history of Upper Pennsylvanian sedimentary rocks.
While collecting marine invertebrate fossils from Upper Pennsylvanian deposits near Jacksboro, Jack County, Texas, one of us (P.
4 (land not surveyed in sections), in the lower part of the Finis Shale Member of the Graham Formation, Upper Pennsylvanian (lower Virgilian).
Although Isodectes was known only from the Arroyo Formation of Texas (Leonardian, Lower Permian) at the time Langston analyzed his data, it has since been found in the Upper Pennsylvanian (Virgilian) of Kansas (Baird 1966; Chorn and Conley 1978).
Upper Pennsylvanian ichnology of Kansas City, Missouri.
A critical review of the Upper Pennsylvanian floras of eastern United States with notes on the Mazon Creek Flora of Illinois, 220 p.
Permineralized Alethopteris from the Upper Pennsylvanian of Ohio and Illinois.