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[[underline]] 1892 [[/underline]] December 18, continued [[line across page]] part of which is the finest exhibition of the non-descript mottled clay I have ever seen. I regard all above the Potomac as Columbia. Toward the south west end of the cut Chesapeake Clay occurred in stratified lines several feet below the gravel indicating that the upper part of the sand may be of that age but the division line most of the way was wholly indistinguishable. This cut oapens out into the Pohick valley at the 19 (16) mile post. Its cut on the southwest side of the Pohick is coarse Potomac sand and gravel cross-bedded and containing soft rotten stones like here on Kansas Avenue. It got dark her and we could see nothing more to Lorton. [[end page]] [[start page]] [[underline]] 1893 [[/underline]] April 2,- Made the tour of the Arlington and Ft. Myer region. I now doubt whether any of the clay on the lower (river) road is Potomac, and think it likely to all be a bluish brick clay of the Columbia. The road cut on the Columbia Road west of the corner did not show well. It may be Potomac instead of Lafayette. Half a mile southwest of Fort Myer on a new road that I came back on then is an exposure near a small stream which seems to be good Lafayette but I found some soft stones and green clay in it which brought specimens of .. Ft Myer is on the Lafayette , but this clearly rests on a heavy bed of Potomac. I found it in a little ravine leading down to the creek on the north and in the creek itself the bluff on the south side shows 10 or 12 feet of good Potomac clay which looks fa-