. ~ ROCHESTER'S HISTORY ~ AN ILLUSTRATED TIMELINE .
. The Stratographic Column for the Genesee River, From Letchworth Park to Lake Ontario .
.The various rock formations and their periods of development. The rock visable in the Genesee River gorge in Rochester represents the oldest formations, shown as numbers 1, 2, 3, and 4 on the chart. The wavy lines represent unconformities. Unconformities are areas where rock formations that are known to be part of the column, are missing from specific locations.
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