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1893
April 2, continued
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varable for plants, but is a little too sandy and crumbly. No impressions were found. There are sand pockets irregularly arranged in the clay. This is 200 yards above Electric road bridge. A cut just north of the bridge shows a good section of the reddish sand and gravel with clay pockets. It is flanked on the north by Lafayette. The cuts at Ft. Myer Heights, previously examined, are about the same and at the original locality on the wagon road I found the Archeon contact better than ever before. Just at the turn in the road and on the n.w. side the Archeon is immediately overlain with clays containing rounded stones Some of these were rotten and I got good specimens right at the contact
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April 16 - Chinkapin Hollow is a ravine with a small stream that crosses the Leesburg pike less than half a mile n.e. of Fairfax Seminary. There, in comparing with Vick Mason & Wm Willoughby, I made a very important discovery. By the roadside near the top of the hill is what seems to be a typical Lafayette exposure, but nevertheless many of the pebbles were soft and decomposed. By the spring at the bottom of the valley ten feet of reddish sand with many clay balls are exposed. This is true Potomac. 100 yards down the stream is a fine section on the left side. It is chiefly sand, but there are clay veins, and in one of these a foot above the stream bed fossil plants were fund in abundance. They  are chiefly ferns, but there are several species and there