Blake Nose

Blake Nose is a submerged peninsula extending northeast from the North American continental shelf, located about 280 miles (460 km) east of Daytona Beach, Florida.

A salient of the Blake Plateau, Blake Nose is a "gentle ramp" of the continental shelf, which was built up during the Eocene, and consists of "carbonate ooze and chalk."^[1] That layer is on top of an older Albian sequence of green claystone and shale, and below that is the K-T boundary.^[2] The discovery of the K-T boundary here is direct evidence of the "mass wasting" of the Cretaceous–Paleogene extinction event caused by the Chicxulub impact event.^[3] Together with other, complementary evidence collected by the Geological Society of America, the phenomena at Blake Nose show that the Mesozoic or 'age of dinosaurs' ended with a sudden, catastrophic extinction event caused by an extraterrestrial object.^[4]

It is about 40 mi (64 km) wide at the base of the peninsula and about 50 mi (80 km) long.

Blake Nose appears as a distinctive "spur" in online satellite maps which show the Atlantic continental shelf of Florida.