The fault below the grey sand. This was first some years ago I believe more than 25 feet beneath the grey sand, buried with it. The Red Medina maybe 40 feet thick and as I pointed before the series comes from all sandstone at any thing bedded sometimes the top to almost shales films, The contact with the Cataract formation is a sharp one - above are very thick red sandstones with shale partings while below are green shales that weather down into small flakes. The little fly here is Cataract formation - totally different from- in them same faults anything seen before. The upper ten feet are all dark grey shales. There a good 2 feet with thin fossiliferous ajillaceous limestone followed by more grey shales for 7 feet, then the dark bedded band limestone. These can be seen in the gulf just with the Medina out of the Tunnel, The contact however is not seen good east of the tunnel where the Medina sometimes are thicker bedded than in the gulf stands out sharply and boldly, See the first graph. Here the succession is different from the gulf for it is as