may however be that the higher beds are somewhat represented in the hollow between the Chattanooga and the heavy bedded Marlins or Stancross formation. I will look into this tomorrow. Here the succession seems to be as at Big Stone Gap. The sandy base of the Marlins rests upon the heavy beds of quartzite making the top of the Rockwood. If the Ostracode bears out this view then there is a great hiatus between the Rockwood and the Marlin's. This also explains why Campbell calls the quartzite a dred again or twice. It lies on the line of post-Rockwood erosion and may or may not be eroded away.