"In the basal 18 miles of the Senjia slate occur all the Black Run fossils collected, and here here are thin limestone lenses none of which are thicker than a half inch. It is in these zones that the fossils are most common, though they are scattered quite sparsely from about 8 to 12 inches from the base of the overliep. Higher in the Senjia one sees blocks of the Higgate limestone conglomerate composed of small that occurs near the base of the Higgate, pottles and somewhat articulate blocks up to 2 feet long are not rare and near the road lies me once at least 10 foot long. How did these blocks get into the Senjia? They were not transported far. They could not be dropped from cliffs since the stratigraphy does not show the presence of cliffs, hence ice could well have dropped them into deeper water. The Senjia slates are therefore the equivalent of the Onkarkian at least, and since near Ormsted there is also Bitica ad Lorraine, and at Three Run Richmondian, it is probable that the 2000 to 3000 feet of Senjia slate are the equivalent of the Ordovician Ordovician ad Cincinnati. Raymond has a student at work collecting north of the Canadian River. He finds above the Beek- antrim a thick shale series in the lower part of which he got the Ambryce fauna. This then is a