What stone do you find in ny state which was used for roofing tiles a hundred years ago?

In New York State, slate was commonly used for roofing tiles about a hundred years ago. This natural stone is prized for its durability, water resistance, and aesthetic appeal, making it a popular choice for roofing materials. The slate deposits in regions like the Adirondacks and the Hudson Valley were particularly significant for this purpose. Today, historic slate roofs can still be seen on many buildings throughout the state.