-->  (FACING PAGE) Figure 18. (A) Example of tepee structure in the Boquillas Formation west of Del Rio, Texas, along US-90, whereby wedging occurred outward from a central fracture yielding the tepee form, as depicted conceptually in (B) (from Lock et al., 2001, reproduced with permission of the Gulf Coast Association of Geological Societies). Arrows in (A) highlight a layer that from the gentle-dipping margin toward the tepee core exhibits significant caliche-related thickening.

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 (FACING PAGE) Figure 18. (A) Example of tepee structure in the Boquillas Formation west of Del Rio, Texas, along US-90, whereby wedging occurred outward from a central fracture yielding the tepee form, as depicted conceptually in (B) (from Lock et al., 2001, reproduced with permission of the Gulf Coast Association of Geological Societies). Arrows in (A) highlight a layer that from the gentle-dipping margin toward the tepee core exhibits significant caliche-related thickening.