sum-crading. It is in these deposits that one finds the Arthrophyus and other so-called peculiar molluscs. Finally the red color leaves these deposits and the next 6 feet or so are a white sandstone. Above these sandstones follows at once a difficult shale - a green shale and then the Clinton clomites. There is hardly any thing about these Clinton bricks to distinguish them from the Rochester shale -- it is only the presence for further things as the Breistonia cylindrica and the Athyris quadriflicata. Can it be that the top of the Medina represents a land interval and that this Clinton is the final a topmost marine invadery from the salt. It is at Rochester that one finds the Pentamerus Maynes in the Clinton but it is not present here in the Glazara River props. Then too it is at the close of the Clinton that one finds the reefs with the oristum species. At the top of the Clinton here there are no reefs and all the forms seen are those of the Rochester. The next highly prolificums zone is near the center of the Rochester shale and in other 20 feet one sees the regular hygonan and associated fauna. Then practically barren shales passing rapidly over into the prolificums dolomite.