The Proceedings of the Eighth International Conference on Creationism (2018)

Whitmore and Garner ◀ The Coconino Sandstone ▶ 2018 ICC 602 Figure 29. “Laminated” Coconino Sandstone. It is often difficult to tell whether the laminations are normal or inversely graded as in HMT-10 and HMT-08. In other samples, the grading is clearly inverse as in JUS-05 and SFRC-10. Both types of grading can be found in eolian deposits (Hunter 1977). According to Hunter (1985) in subaqueous cross-strata, inverse grading dominates in the upper and middle parts of the dune with sharp contacts between laminae. In the lower part of the set, laminae are less regular and normal grading is more common when laminae are present. It is important to understand that Hunter’s studies (1977, 1985) were made on relatively small dunes. More laboratory and field study is needed on large dunes as would have been the case in the Coconino. Note the bounding surface preserved in SFRC-10.