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[[underline]] 1892 [[/underline]]
December 18, continued
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represent the upper 40 feet of the White House Bluff section, as described on Dec. 5. In one place on the south side of the first cut on the W & A. R.R. the greensand at the level of the railroad bed is very well marked, greenish olive colored and may represent a thin bed of Pamunkey. No fossils could be found.
A quarter of a mile further south east a brisk stream flows under the railroad to the northwest and cuts down 25 or 30 feet below the tracks. In the bed of this stream, in some places forming its bed is a tenacious blue clay evidently Potomac (specimen).
The next cut shows the marine Tertiary very clearly. The upper portion weathers a lively red and the base is very dark green and may be Pamunkey, and about the same is true of the next.
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South of the ravine in the fill of which the 13 (22) mile post stands is another cut 20 feet deep. At the upper (north) end on the east side a gulch has worn down to the ravine, and just opposite the whistle board, 20 feet below the track the Potomac white and slightly mottled clay is nicely exposed. The cut itself consists chiefly of Potomac sand rather characteristic with clay pockets in one of which Vick actually found a dicotyledonous leaf. A thin bed of Miocene checkered clay overlies the Potomac sand & there is red loam over that. The Lafayette cap is about three feet thick.
With the next cut to the south begins the great Franconia gravel bed which is treated as Lafayette by Darton. I also regarded it so when I visited and part of it must be, but it presents some peculiarities that give rise to doubts. It contains clay pockets and lenses of certain Potomac. It also has interstratified with