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Published online by Cambridge University Press: 01 May 2009
The physical history of sedimentary rocks is written in charácters which sometimes baffle the skill of geologists to interpret. This may be because geologists are prone to devote too little time to the study of rocks in the making, and too much to the finished products of sedimentation. It is well to remember that the most unpromising pool or bit of lake shore may hold the key to the most perplexing of these hieroglyphics.
A brief review of the history of the various attempts to explain certain curious impressions found on the Niagara dolomites of Western New York will illustrate the need of closer observation and study of some of the phenomena of our ponds and lakes resulting from the interaction of wind and water.
page 158 note 2 Folio U.S. Geol. Surv. No. 150, pl. xxv.
page 158 note 3 Geol. New York, 1843, pt. iv, pp. 92–3, fig. 29.
page 158 note 4 Proc. Amer. Assoe. Adv. Sci., vol. iv, pp. 10–12, 1850.
page 158 note 5 Ibid., p. 12.
page 159 note 1 Ichnology of New England, 1858, pp. 121–2.
page 159 note 2 Folio U.S. Geol. Surv. No. 150, pl. xxv.
page 160 note 1 The writer is able to publish this photograph through the courtesy of Mr. G. K. Gilbert.
page 161 note 1 The writer's observations have been limited to shallow water, but it is probable that interference ripple-marks would be produced in water of considerable depth where a rocky ledge or other obstruction to normal oscillation of the water generated by wave action extended into a sandy bottom.