Full Article Title
Very large cross-beds with a measured height of 7.5 m occur in the middle of the Anchor Limestone (Lower Mississippian, Las Vegas Range, southern Nevada) and are composed of pebble-granule-sand, crinoid grainstone. The bedform is understood to be the preserved remnant of an enormous, subaqueous, 3-dimensional dune with original height estimated conservatively at 15 m with length of about 800 m. Dunes produced in laboratory flumes and dunes observed in natural shallow-water straits allow scaling of the hydrodynamics of the tractive current that produced the large-scale cross-beds within the gigantic subaqueous dune. The depositional environment of the dune is interpreted to be a marine slope with a water depth of 140 m. Flow thickness exceeded 15 m and flow velocity is estimated conservatively at 2.5 m/s toward the west. The large scale of this bedform attests to the rapid, catastrophic emplacement of coarse lime sediments in this section of the Anchor Limestone. This enormous dune is interpreted to be the distal tractive current deposit formed by the fluid turbulence generated by breakdown of a hydroplaning, fast-moving, hyperconcentrated sediment gravity flow after it had traversed northern Arizona.
Limestone, cross-bedding, subaqueous dune, bedform analysis, flow depth, flow velocity, hydrodynamics, Anchor Limestone, Redwall Limestone, Las Vegas Range, Grand Canyon, Nevada
DigitalCommons@Cedarville provides a publication platform for fully open access journals, which means that all articles are available on the Internet to all users immediately upon publication. However, the opinions and sentiments expressed by the authors of articles published in our journals do not necessarily indicate the endorsement or reflect the views of DigitalCommons@Cedarville, the Centennial Library, or Cedarville University and its employees. The authors are solely responsible for the content of their work. Please address questions to email@example.com.
Stansbury, Darry D.
"Flow Dynamics of an Enormous Subaqueous Dune within the Anchor Limestone, Las Vegas Range, Clark County, Southern Nevada,"
The Proceedings of the International Conference on Creationism: Vol. 5
, Article 26.
Available at: https://digitalcommons.cedarville.edu/icc_proceedings/vol5/iss1/26
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.