Chazy Fossil Reef
| Chazy Fossil Reef | |
|---|---|
Stromatoporoid at Fisk Quarry, Isle La Motte, Vermont | |
| Location | Clinton County, New York Grand Isle County, Vermont |
| Coordinates | 44°51′10″N 73°20′24″W / 44.8528°N 73.3400°W |
| Area | 1,567 acres (6.34 km2) |
| Governing body | Mixed (federal, state, and private) |
| Designated | May 2009 |
Chazy Fossil Reef is a United States National Natural Landmark spanning three Lake Champlain islands in Clinton County, New York, and Grand Isle County, Vermont. The site is recognized as the oldest known diverse fossil reef in the world, and contains fossils that demonstrate faunal succession. The 1,567-acre (6.34 km2) site was dedicated as a National Natural Landmark in May 2009.