17 Unit #31 Silty siltstone coals. 3.9m shale w/ some lags Partially covered interval #22 Unit #32 Coal, impure, dull silt 4.6m coal with shale partings Sample ECS-90-7 coal sample. #23 Unit #33 Soil sequence. 11.4m max 1-2m ④ coal bordered by org rich mud ③ grey mudstone / siltstone ② iron concretion layer ① grey siltstone / mudstone There are five such cycles in this unit. Slide photo of one cycle.