Inwood marble is much softer than the other types of Manhattan bedrock, and so it erodes much more easily. There were once veins of marble surrounding Manhattan, connecting it to the adjacent landmasses. As the marble washed away, it created the channels that eventually eroded into the waterways now encircling Manhattan: the Hudson, East, and Harlem Rivers.
Day 36
Another gorgeous piece of Inwood marble
February 4th, 2012
Gorgeous shot Matt.