Notable Rock Formations and Geological Sites in New York State

Igneous Rocks

• Palisades Sill – Palisades Interstate Park, Rockland County
• Shawangunk Ridge (conglomerate/quartzite)
• Storm King Mountain, Breakneck Ridge, Bear Mountain (Hudson Highlands)

Metamorphic Rocks

• Manhattan Schist – underlies NYC skyscrapers
• Inwood Marble – Inwood Hill Park, Manhattan
• Fordham Gneiss – Bronx
• Yonkers Gneiss – Yonkers
• Peekskill Gneiss – Peekskill

Sedimentary Rocks

• New York City Group – NYC area
• Hudson River Group – Hudson Valley
• Catskill Formation – Catskill Mountains (Devonian clastics)
• Lockport Formation – Niagara Gorge (Silurian dolostone)
• Salina Formation – Syracuse (evaporites)

These formations reveal over a billion years of geological history, from Grenville orogeny to Appalachian building.