. Brigham Young University science bulletin. Biology -- Periodicals. â "7 I. KiG. 4. A. Roadcut exposure of Dakota Sandstone Formation. The upper massive sandstone unit (A) of this formation from this region rests upon the middle shale-eoal-sand unit (B). C dehmits an unfossiliferous ash, and D represents the chief fossiliferous ash seam. B. Contact Ix'tween Dakota Sandstone and Cedar Mountain-Morrison Formation. The Dakota forms tlie slope and ledge (A) which rests upon the slope of tlie Cedar Mountain-Mor- rison Formation ( B). that the Dakota was of Upper Cretaceous (Ceno- manian) age
. Brigham Young University science bulletin. Biology -- Periodicals. â "7 I. KiG. 4. A. Roadcut exposure of Dakota Sandstone Formation. The upper massive sandstone unit (A) of this formation from this region rests upon the middle shale-eoal-sand unit (B). C dehmits an unfossiliferous ash, and D represents the chief fossiliferous ash seam. B. Contact Ix'tween Dakota Sandstone and Cedar Mountain-Morrison Formation. The Dakota forms tlie slope and ledge (A) which rests upon the slope of tlie Cedar Mountain-Mor- rison Formation ( B). that the Dakota was of Upper Cretaceous (Ceno- manian) age and could be correlated with the Woodbine Formation of Texas. However, Berr\' (1922) later considered the Woodbine Forma- tion to be of Turonian age, although still to be correlated with the Dakota Sandstone Forma- tion. This determination was based upon a de- tailed anahsis of the flora of the Woodbine i'ormation from Lamar Count\', Texas, where- in it was noted bv Berry that this flora had three species in common with Turonian floras of Europe. MacNeal (1956) restudied the Woodbine flora from collections made in Denton County, Texas. Based upon examination of more and better material. MacNeal disagreed with the age determination of Berry, and the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brigham Young University. Provo, Utah : Brigham Young University
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