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Eduncle posted an MCQ
October 19, 2019 • 18:03 pm 0 points
  • IIT JAM
  • Geology (GG)

Which of the following statements are correct ?

I. In a planar tabular cross-bedding, the upper and lower bounding surfaces are planar and parallel II. In a planar tabular cross-bedding, the upper and lower bounding surfaces are planar but not parallel III. In a trough cross-bedding, both the upper and the lower bounding surfaces are curved IV. In a trough cross-bedding, the upper bounding surface is planar and the lower bounding surface is curved

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    Eduncle Best Answer

    Cross-Bed Geometries : 
    (i) McKee & Weir (1953) - Tabular & Trough Cross bedding 
    (ii) Tabular Cross beds - units broad in    lateral dimensions with respect to seti thickness with planar bounding surfaces.
    (iii) Migration of large-scale ripples and dunes; lower flow regime
    (iv) Trough Cross beds - units whose bounding surfaces are curved, consist of elongate scour filled with curved laminae
    (v) Migration of small-scale or large-scale ripples
    (vi) Paleocurrent measured in dip direction of foreset laminae

    26.1.PNG
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