Permian Shoreline Eolian Complex in Central Arizona: Dune Changes in Response to Cyclic Sealevel Changes

Sedimentology and depositional environments of the Lower Permian Yeso Formation, northwestern New Mexico

“…1), the size of the cross-sets and the consistent southerly slip-face orientation in tabular-planar and wedgeplanar cross-stratified sandstones indicates deposition in transverse or barchanoid dunes migrating toward the southsouthwest (Blakey and Middleton, 1983). In the Zuni Mountains, however, dunes in the Meseta Blanca Member exhibit northerly transport directions.…”

“…Farther to the south and east, in the Lucero uplift and Abo ruins measured sections, bimodal north-south transport is evident. This fluctuation in eolian transport direction may reflect onshore winds or seasonal changes in wind directions that are commonly associated with coastal dunes (Blakey and Middleton, 1983).…”

Sedimentary cycles in a Mesoproterozoic aeolian erg-margin succession: Mangabeira Formation, Espinhaço Supergroup, Brazil

“…Their occurrence at the top of each cycle throughout the succession demonstrates that the formation comprises at least 14 separate sequences. Each supersurface records a hiatus in accumulation (Blakey and Middleton, 1983;Loope, 1985;Talbot, 1985). The genesis of the supersurfaces requires a negative sediment budget, where an earlier accumulation is susceptible to erosion.…”

Revisions of Middle Jurassic nomenclature in the southeastern San Juan basin, New Mexico; Eolian and noneolian facies of the Lower Permian Cedar Mesa Sandstone Member of the Cutler Formation, southeastern Utah

“…The dune facies of the Cedar Mesa Sandstone Member consists primarily of fine-grained quartzose 3>B}, The uniform dip direction suggests that the Cedar Mesa dunes were probably transverse or barchanoid ridge dunes (Blakey and Middleton, 1983) that were migrating to the southeast. Although weathering has removed much of the detail from foreset surfaces, some traces of ripple marks oriented subparallel with the direction of dip are preserved.…”

“…In some of these strata, the ripple form can still be recognized. Several workers consider these laminae to be diagnostic of eolian deposition (Blakey and Middleton, 1983;Loope, 1984a).…”