[[underline]] 1892 [[/underline]] 
December 18, continued 
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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 1 9 
(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. Haifa 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 1 0 or 1 2 feet of good Potomac clay which looks fa- 
Local field note-book of Lester Ward 
Transcribed and Reviewed by Digital Volunteers 
Extracted Oct-11-2015 07:35:03 
Smithsonian Institution Transcription Center, Smithsonian Institution Archives 
