for the sandstone near the center, This zone is about 20 foot thick. The heavy bedded sandstone join[s] ten foot thick (Could not see beneath the cliff). Shiz[?] thin. Below are red shales apparently divided from sandstones or hard beds. These seem to go down to the rim and may be over 100 foot thick in the exposure. From the evidence today it seems to me that the Medina is far more closely related to the Miajaran as here shown than to the Richmond Gap area. There is not a single Richmond fossil present in this Medina [illegible] while all seem clearly related to the Miajaran. The upper or prolificuous Medina is clearly a marine deposit for about two-thirds of it is regular bedded, one always sees traces of the Alcipula and at about 27 feet from the top in a zone not more of mud[?] thick is where I collected the pelecypoda. This upper Medina clearly goes over into non- typical marine deposits in which there is much cross bedding, some scouring out of deposits and subsequent filling of the cavities, rolling of mud into irregular pellets and brecciating of shale into the sandstones, and occasionally a little evidence of irregular