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Stratigraphic details of the Lytle and South Platte formations in the Denver area with emphasis on the distribution of the refractory clayrocks.
The D and J sandstone of the Cretaceous Dakota Group are considered as the major oil and gas producing units within in the Denver Basin. Denver Basin is a sub-basin of the Early Cretaceous Western Interior Basin .These units are well understood within the northern Denver Basin and the linkage between the subsurface units and their equivalents in outcrop in the Front Range is well-established. These strata have gained less attention in southern parts of the basin and the linkage between the subsurface units and their equivalents in southern outcrop is not yet established. The main purpose of the study is to investigate the linkage between the subsurface Dakota Group units within the southern Denver Basin and their equivalents in outcrop of southeastern Colorado. This was achieved by correlating sequence stratigraphic surfaces within Dakota Group strata in the Denver Basin using well-log data and then correlating these surfaces with their age-equivalents in outcrop of southeastern Colorado. By proving this linkage, a better understanding for the correlation of Dakota Group strata from subsurface to outcrop is represented in the southeastern part of Denver Basin which can be used as a tool in future research in the area and can forward regional paleogeographic reconstruction for this time interval. Paleogeography, deposition and distribution of the J and D Sandstone were illustrated in the study using the Buffer and Buttress model. Valley intersection of different generation at the same stratigraphic level in both the J and D Sandstone were observed in the study area and were explained also by using the Buffer and Buttress model. The subsurface Huntsman Shale continuation in southern the Denver Basin to surface exposure in southeastern Colorado outcrops was supported based on thickness trend, fossil assemblage, and facies which constrained the correlation of the subsurface Dakota Group units with their surface equivalents in outcrop southeast Colorado.
The early Paleozoic of northwestern and west-central Colorado is represented by continental shelf and continental shelf marginal sedimentary rocks of Late Cambrian, Ordovician, and Late Devonian ages. Differentially epeirogenic movements along fracture systems having Precambrian origins affected sedimentation patterns and probably mostly account for intervening times of erosion or nondeposition; activity along these tectonic elements persisted into the Neogene and possibly continues. These tectonic elements are west-north-west, south-southeast, and northeast trending fracture systems and an east-trending aulacogen in the approximate area of the modern Uinta Mountains. North-central Colorado was emergent land throughout most of this time and shed clastic sediments at varying rates to the west and southwest. Episodic continental motion and the effects of the Antler orogeny to the west are probably the direct causes of these epeirogenic movements.