East Rock is a prominent geological formation located in New Haven, Connecticut. It is part of the larger East Rock Park, which offers scenic views and recreational opportunities. The rock is approximately 80 million years old and is composed mainly of traprock, a type of volcanic rock. The area is popular for hiking, picnicking, and enjoying nature. Visitors can access the summit via several trails, where they are rewarded with panoramic views of the surrounding city and Long Island Sound. East Rock is also significant for its historical role during the American Revolutionary War.