"The Stones River has for less than an alternation of lime and impure thin bands and is therefore pure lime li. Here again the infraformational eroyl. are present and for some time changed into chert. These occur at the base of the Stone River. Barber is snapping the Hagerstown folio on the basis of the character of the limestone and the residue of chert. He says he has 35 different Ordovician sheets. Then he also uses the topography and use the character of the farm land including fruit trees. Fossils are too scarce to get. Finally the structure and thickness of beds is taken into account and lastly the fossils. Every now and then we come upon tritudes of Iron Cambrian sandstones when nearest to the Blue Ridge, and of Juniata and Greolia when near North Mountain. These are stream material sometimes near present streams and at other times indicate lost rivers. In another place we saw a little stream divide for spring. These waters abound in Phgea and go to make of small beds sometimes of considerable thickness. At 2.10 P.M. we left on the B. & O. for Harrieton