Trouton Fauna cystoid (? Syptocystita), small Triplecia retans. As the top of the Trouton the limestone be- come more chalky and apparently change rather quickly into the Haast shale of the latter. Just before this change takes place the surface is covered abundantly with Orthoceras particiforme of Trone fairly. They are very common. Some 20 feet below this Haast shale the fauna is practically like that below. R. deltoida is still present but more flatter and some of them are near R. alternata but still retain some of the concentric congre- tions. All in all the Trouton fauna is here originally barren but this may be due rather to the dense thin bedded limestone that one Further they are grown up distorted by the givens. almost barren of shells. I suppose if one where to erode the limestone more than I did a greater fauna would turn up. The zone (2) is a mistake. This one is drifted Haast slate. Upon or down an