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[[underline]] 1892 [[/underline]]
Oct. 30.-Made some examinations in the place called Ft. Myer Heights midway between Rosslyn and Fort Myer. The new electric railroad cuts through some of the hills and graded streets furnish other good exposures. In one of these latter running east and west, and north of Ft. Myer Heights there is seen on the north side some gray sand closely resembling that of the James. This is in the disturbed material overlying the clay which shows clearly in gullies below. It is doubtful whether it belongs to the Potomac, but it contains balls of Potomac clay. In the north and south cut at Ft. Myer Heights proper the blue and mottled clay rests directly on the Archean, but the exposure in the old road farther down the hill still shows the cobble stone layer between the clay and the gneiss as de-
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scribed by me on July 11, 1891 (See local field note book No 1, I am half inclined to consider this as a slide of Lafayette material from above, the clay having washed down upon it later.
[[underline]] November 6. [[/underline]]
Revisited the Mount Vernon locality and, assisted by Victor Mason, made a good collection of fossil plants, all from the same spot. They seemed to grow better as we went in. Found many new things, and better specimens of all the old ones, especially the Hedera. Among the new ones are conifers, ferns, and cycads. The most remarkable fact is that we found Potomac plants in the green-sand above the buff clays, not, as on Pa Ave Extended, in Potomac clay balls.
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