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• <br />• <br />• <br />Alluvlua and younger Tertlory / Cretaceous Sedlaents <br />® yer~e,Jo For^otion, coal-Deorlnp siltstone, sandstone <br />relotivtly Isperaeoble <br />irlnido0 Sandstone, aosslve sandstone, relatively DerseaDle <br />® Pierre Shale, slitsfon4 cloystone, retotlvely I~peraeaDle <br />GEOLOGIC STRUCTURAL SETTING <br />PrecoaDrian Dranltlea F/GORE 2 <br />x.04.5-3 <br />sca~c Iw r~us '. <br />