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===Other names=== “Flat Gap limestone” is an informal name applied to producing zones between the [[Grassy Knob Chert]] (above) a

===Other names=== ...embers created a bias toward connecting isolated sandstone outcrops in the field. None of the named members of the Caseyville can be traced more than a few

.... 7 coal, but its exact place is doubtful. For this reason local formation names will be applied and the top of the Herrin coal will be used as the formatio ===Other names===