Day 2, Stop 4
Navajo Sandstone Soft Sediment Deformation
GPS Location:
38o 17.059' N
111o 09.854' W
Ages:
Early Jurassic
Rock Units:
Navajo Sandstone
Features Present:
This is another example of soft sediment deformation in the Navajo sandstone called a pop up/flower structure (Morris et al. 2003). This structure may have been caused by overpressurized pore pressures and strong ground motion (e.g., possible Jurassic seismic activity).
Depositional Environment:
Eolian
Figure 1: Large Navajo Sandstone soft sediment deformation feature (“pop up/flower structure”).
Figure 2:A closer view of the “pop-up/flower structure “ shows the deformation of the cross stratification this is continuous across the top of the fold.