In the afternoon Stizenwe took me at mt 13 miles D. B. of Tucum to Ogden's base to the south of the Cajo Road. The place is an at and med quarry for limestone turned to lime. The series is Ripon Penn- sylvanian, and something like 200-300 ft of thick bedded dark-hue limestone, are seen. The fossils are all pseudomorphs crusted out on the surface. While these surfaces now show or lateritic soil they must have formerly been joint surfaces along which the water could dissolve and carry the solids to silica. The place has been visited now by many students so that all the good things had been taken away. A small Semionula and Papyr uths are the common forms. Several species of Productus occur, and they are the real guides to the horizon. In the life here a large cardinal Euomphalus is