| OCR Text |
Show 204 carbonate rocks interbedded with sandstones and thin coals. Sandstones more prominent in the upper coal sequence, where they are are interbedded with organic deposits and mudrocks. The high-organic, lower subunit is dark. At North Horn Mountain it is readily distinguished from the lighter colored upper subunit, which contains prominent yellow sandstone beds (Figure 4.3). The coal sequence represents lakes and streams a a paleoenvironment of dissecting swampy wetlands (Franczyk tectonically subsiding basin (Lawton et shallow ephemeral and Pitman, in 1991) 8/., 1990). North Horn Mountain is situated about 35 km east-southeast of the Sanpete Valley anticline (Stanley and Collinson, 1979) and about 35 km west-northwest of the San Rafael Swell. These two structures represent into which sediments that deposited. now a paleo-highland comprise North Horn highlands has depositional basin probably underwent by sedimentation, resulting in because known lowland basin were being a a changed since the Cretaceous. The slow, steady subsidence accompanied complete stratigraphic section at the type locality. type section of the North Horn Formation is considered continuous, no large hiatus above the lowest subunit of the lower (Figure 4.2). Some weathering occurred, record Mountain a No structural evidence is available to indicate that the distance between these two ancient The that bounded episodes Mikhailov et 8/. throughout is pauses in sedimentation, suggested by of soil formation (1994). during variegated unit is which subaerial the presence of horizons of caliche Which as was elsewhere Caliche horizons that similarly suggested to represent paleopedogenesis most of the middle subunit of the lower variegated occur unit. However, no |
