Journal of Geological Research / 2013 / Article / Fig 6

Research Article

Multiscale Erosion Surfaces of the Organic-Rich Barnett Shale, Fort Worth Basin, USA

Figure 6

(a) Thin section photo shows concentration of phosphatic pellets associated with erosion surface. (b) Thin section photo shows rounded and subrounded phosphatic pellets; note the pyritic rim inside the phosphatic pellet (white arrows). (c) Thin section photo shows reworked broken phosphatic pellet associated with erosion surface. (d) Core photo shows the extensive pyrite cement of the erosion surface (white arrows). (e) Electron microprobe photo shows framboidal pyrite (black arrows) developed around sponge specula (white arrow) (photo dimensions is 527 × 527 mm). (f) Thin section photo shows fine euhedral pyrite crystal through the core of large sponge spicule associated with erosion surface.

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