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3

a northeasterly, and once a southwesterly dip. In the yellowish and dark brown clay near the uppermost part of the section at Gay Head, and in the green-sand immediately resting upon it^[[†]], Mr. Lyell found the teeth of a shark, that of a seal, vertebrae of Cetacea, crustacean remains, and casts of [[underlined]] Tellina [[/underlined]] and [[underlined]] Mya [[/underlined]]. These prevail at intervals through a thickness of nearly one hundred feet, and are followed by beds of sand and clay with lignite. Mr. Lyell found no remains in the red clays. Many rolled bones were found in the osseous conglomerate. 

In the section at Chilmark similar strata to those at Gay Head occur, but the general dip is southwest. Some of the folds, however, give anticlinal dips to the northeast as well as the southwest, and there are many irregularities, the beds being sometimes vertical and twisted in every direction. Several faults are seen, and veins of iron-sand, which intersect the strata like narrow dykes, as if there had been cracks filled from above. One bed of osseous conglomerate at Chilmark, four yards in thickness, is vertical, and its strike is well seen to be north 25° east, so that the disturbances have evidently been so great that it would be difficult with-
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† Nos. 5 and 6 of Prof. Hitchcock's section.