Research Article
Multiscale Erosion Surfaces of the Organic-Rich Barnett Shale, Fort Worth Basin, USA
Table 2
Characteristic features of erosion surfaces in both the proximal and the distal muddy settings.
| Characters | Proximal muddy settings | Distal muddy settings |
| Boundary nature | Irregular, scoured, cutting down, gradational to irregular | Sharp to irregular | Lithofacies | Calcareous-rich mudstone facies with dolomitic cementation | Clay-rich mudstone facies with pyritic cementation | Reworked concretions | Rounded to subrounded calcareous shale intraclasts | Rounded to subrounded phosphatic pellets | Shelly laminae | Reworked shell fragments | Compacted shelly laminae | Shale ripup clasts | Rarely occurred | Elongated, flaky with sharp edges | Energy levels | High energy enough to include reworked shale intraclasts and other components | Low energy where the shale rip-up clasts are suspended in the sea bed layer |
|
|