Multiscale Erosion Surfaces of the Organic-Rich Barnett Shale, Fort Worth Basin, USA
Figure 9
(a) Thin section photo shows sequence-scale erosion surface with irregular nature, pyritic reworked intraclasts, and reworked shell fragments with the opposite spectral gamma ray response that shows the abrupt upward increasing above the erosion surface. (b) Thin section photo shows irregular sequence-scale erosion surfaces; note the underlying clay phosphatic-rich facies and the overlying laminated calcareous facies. The opposite log is the spectral gamma ray value of this interval showing the coincide upward-decreasing pattern. (c) Thin section photo shows parasequence-scale erosion surface with underlying phosphatic-rich mudstone facies with the opposite Spectral Gamma Ray response that shows the upward decreasing above the erosion surface. (d) Thin section photo shows irregular parasequence-scale erosion surfaces; note the underlying clay phosphatic-rich facies and the overlying laminated calcareous facies. The opposite log is the spectral gamma ray value of this interval showing coinciding upward-decreasing pattern.
