where is the jackfork group in the ouachita mountains?
<answer> The jackfork group in the ouachita mountains in Arkansas. <context> a guidebook to the highway geology at selected sites in the boston mountains and arkansas valley, northwest arkansas gb 93-1 scales of geological heterogeneity of pennsylvanian jackfork group, ouachita mountains, arkansas; applications to field development and exploration for deep-water sandstones gb 93-2 guidebook to carboniferous and early paleozoic shelf and basin facies in central arkansas