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The Manhattan Prong 

The Manhattan Prong was formed approximately 550 million years ago and extended all the way to southwest Connecticut (from the Algonquian Quinnitukqut meaning “at the long tidal river”). Its formation consisted of rolling hills and valleys, controlled by the underlying bedrock. Much of the bedrock was covered by Atlantic Coastal Plain deposits. Metamorphic rocks resistant to erosion comprised the hills, including the Fordham and Yonkers Gneiss, the Lowerre Quartzite, and the Manhattan Schist. The Hudson, Harlem, and East Rivers and the major north-south valleys in (what is now often referred to colonially as) northern Westchester County are all underlain by easily-erodible Inwood Marble formed from the metamorphosing of shallow water marine carbonate and clastic sediment. The formation of Inwood marble extended to the Inwood section of northern Manhattan. The rocks of the Manhattan Prong were tightly folded and metamorphosed primarily during the Taconian Orogeny, about 450 million years ago.

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In Geologic Time 

Much of New York State’s bedrock and the Adirondack Mountains were formed by ancient Precambrian crystalline basement rock forms. About 450 million years ago the biotite-rich bedrock (made of gray quartz and white orthoclase) known as the Manhattan Schist transformed from shale to metamorphic rock, and constituted part of Manhattan (from the Munsi language of the Lenni Lenape/Delaware “island of many hills”) during continental collision between the floor of the present-day Atlantic Ocean, and what would later be known as the East Coast of North America. In the area often referred to as midtown Manhattan, the bedrock lies within a few feet of the ground’s surface, and within 40 feet of the surface in lower Manhattan making skyscrapers possible, whereas accessing the bedrock was (and still is) cost-prohibitive at a depth of 4-5 times deeper in other parts of so-called New York City.

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Shallow Seas 

During the Paleozoic Era, parts of the region were uplifted to form the Allegheny Plateau (a physiographic section of the larger Appalachian Plateau province). Other areas nearby were flooded by shallow seas depositing sedimentary rock sequences. Stream erosion crossed the plain and carved away all of the rock except the harder stone of the higher peaks of the Catskill Mountains, which all have about the same elevation today.  Much of the rocks in the Catskill Mountains were deposited by rivers near sea level, and are com­posed of Devonian-aged sed­i­men­tary bedrock (sand­stones, shales and con­glom­er­ate formed in ancient river val­leys). The green and red­ striated clays visible on the edges of stream ­banks are ancient glacial lake deposits eroded from siltstones and shales that contain fossil remains of plants, clams, and insects from the Devonian Period.

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The Pleistocene

Fast forward to 2.6 million years ago and in the Pleistocene Epoch glaciers carried along vast amounts of sands, soils, gravel, and boulders leaving deposits up to 300 meters thick in some valleys. This left the Catskill region low and flat, and hollowed existing trenches as mammoth ice sheets repeatedly advanced across New York State. The towering ice widened and expanded former river valleys to make the Finger Lake troughs. Some of the finger lakes were pushed down so deeply by these glaciers that their earlier bedrock floors lie below sea level.

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Waterscapes

While it took 3.8 billion years to sequester minerals that surround what is still commonly referred to as New York City and build a baptismal freshwater flow, it took less than 100 years of industrial experimentation to corrupt it, and more than 150 years to build a public water system that’s been continually in process…

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Colonization and the Power of Language

At the time of European contact in the 16th and 17th centuries, the Wappingers and Canarsee inhabited Manhattan Island in semi-permanent settlements. They were Eastern Algonquian-speaking subgroups of the Algonquian peoples. The Lenni Lenape once occupied most of the northeast coast and Westchester, Putnam, and Dutchess Counties as well as the land between the Delaware and Hudson Rivers—this is known as Lenapehoking, meaning Land of the Lenape. As the myth goes, the Dutch “purchased” Manahatta island from the Canarsee Lenape in 1626. The Canarsee likely viewed the “sale” of Manhattan as a deal to share the land, but not to sell it. The transaction, enforced by the eventual building of a wall around what the Dutch had renamed as New Amsterdam, marked the very beginning of a forced mass migration of the Lenni Lenape from their homeland. The wall, which started showing up on maps in the 1660s, was built to keep the Native Americans and the British out. It eventually was renamed Wall Street, and Manahatta was renamed Manhattan (Smithsonian). Lenni Lenape placenames including Gowanus, Hackensack, Manhattan, Passaic, Rockaway, and Weehawken make up the toponymy of metropolitan New York. 

The Lenni Lenape of the Eso­pus (including Catskill, Mamekoting, Waranawonkong, and Wawarsink) lived within the water­shed and began encoun­ter­ing Dutch set­tlers in the early 1600’s. Later, waves of immi­grants settled in the area. The new arrivals slowly pushed Native Americans from these ances­tral lands. Historians have traced the beginning of water privatization to around the same time as in Malvern, England. There, spring water was first bottled on a commercial scale at The Holy Well. During the second Anglo-Dutch War, New Amsterdam was renamed New York to honor the Duke of York. The Duke of York later became King James II of England and James VII of Scotland. In 1667, the first public well was dug in front of Bowling Green, New York.

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Toxic Water, Part I

While New York City’s water is now touted as some of the cleanest, unfiltered water, this was hardly the case in the 1600’s. The first well dug in 1667 pumped briny water, so most people drank from the Collect, which was the region’s main freshwater source. However, the Collect eventually became a site to dump chamber pots, dead animals, and tannery waste. It became so polluted the city paved over it, becoming Paradise Square, then Five Points, now Collect Pond Park. In the early 1700’s cleaner water was arduously transported from Brooklyn to Manhattan, which was tapped from wells in Brooklyn and western Long Island. While Brooklyn had an adequate supply of clean groundwater, it could not meet the needs of both Brooklyn and Manhattan residents. As the city’s population increased through the 19th century, more wells were dug without separate systems for sewage and garbage. Additionally, the wells that were dug to tap groundwater were stone-lined and became contaminated with salt water from the Hudson and East Rivers.

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Toxic Water, Part II

Further fueling the quest for clean water, the foul quality of Manhattan’s water supply caused epidemics of yellow fever (the first of six epidemics killed nearly six percent of the population) and cholera. (The cholera outbreak was caused by the bacterium Vibrio cholerae, often found in contaminated water.) On June 26th, 1832 the first cholera outbreak struck Manhattan. Wealthy New Yorkers fled to the country to avoid infection (about one third of the population), leaving mostly immigrants and low-income families. More than 3,500 people died, with the first of many deaths in the Five Points neighborhood (current day Foley Square and Chinatown), where many Irish-Catholic immigrants and African Americans lived. The need for a new supply of fresh water for residents was crucial.

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Tanneries

Around the same time, much of New York’s Catskill Mountain region and the Ashokan Watershed area had become central to resource extraction. Tanneries would be supplied by the area’s verdant hemlock trees, while charcoal kilns and quarries sprung up along rivers, creeks, lakes, streams and expanding trade routes.

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