. Brigham Young University science bulletin. Biology -- Periodicals. Fig. 2. .K. Southeast view down canyon towards West- water, Grand County, Utah. The Dakota Sandstone Formation forms the hills and slopes in the fore- ground and is exposed along the roadcut. Original collections from the Dakota Sandstone of this region were made in the roadcut (A). The Mancos Shale Formation o\erlies the Dakota in this region. B. Close-up of collecting site (A) in Fig. 1. This site \ielded the best colections of fossil plants from this area. tained from the Dakota Sandstone. This prob- lem became so acute th
. Brigham Young University science bulletin. Biology -- Periodicals. Fig. 2. .K. Southeast view down canyon towards West- water, Grand County, Utah. The Dakota Sandstone Formation forms the hills and slopes in the fore- ground and is exposed along the roadcut. Original collections from the Dakota Sandstone of this region were made in the roadcut (A). The Mancos Shale Formation o\erlies the Dakota in this region. B. Close-up of collecting site (A) in Fig. 1. This site \ielded the best colections of fossil plants from this area. tained from the Dakota Sandstone. This prob- lem became so acute that Berrv (1920) further stated, "It has become increasingh' clear of late years that Dakota flora was not a unit and had no precise stratigraphic ; Berrv (1920) pro- posed that in order to eliminate this problem, a true Dakota flora mav be defined as "mean- ing thereb\ the equivalent of that of the Wood- bine Formation of Texas, and those of corre- sponding age elsewhere. . ." This interpreta- tion, houever, has one inherent difficulty. That is, it does not allow for the possibility that within the same formation, fossil assemblages ma\ differ sufficienth' to render their com- |iarison with the flora from another formation difficult. This ma\' result either from a non- random geographical distribution of fossils »i^fb»n. Fk;. .3. A. Overview of Dakota Sandstone Formation showing massive upper sandstone unit resting upon sliale-coal-sand imit. The arrow points to a collect- ing excavation. B. Close-up of excavation in Fig. 1 illustrating lithology of shale-coal-sand unit. The upper coal (B) and unfossiliferous ashes (A and C) have been removed in this excavation exposing the fossiliferous ash upon which the worker is 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 Brigha
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