The J-Anomaly Ridge is a

bathymetric Bathymetry (; ) is the study of underwater depth of ocean floors ('' seabed topography''), river floors, or lake floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography. The first recorded evidence of water ...

feature in the

North Atlantic Ocean The Atlantic Ocean is the second largest of the world's five oceanic divisions, with an area of about . It covers approximately 17% of Earth's surface and about 24% of its water surface area. During the Age of Discovery, it was known for se ...

, extending southwest from the eastern end of the

Grand Banks of Newfoundland The Grand Banks of Newfoundland are a series of underwater plateaus south-east of the island of Newfoundland on the North American continental shelf. The Grand Banks are one of the world's richest fishing grounds, supporting Atlantic cod, swordf ...

. It has a length of about and rises above the general level of the

Sohm Abyssal Plain The Sohm Abyssal Plain is in the North Atlantic and has an area of around . It is located off the coast of the Canadian Maritime provinces and New England in the United States. The region was named for Rudolf von Willemoes-Suhm, a German naturali ...

. The ridge consists of anomalously thick

oceanic crust Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramaf ...

that formed as a result of a major volcanic pulse during the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

References

External links

* * Underwater ridges of the Atlantic Ocean Volcanism of Newfoundland and Labrador Cretaceous volcanism Oceanography of Canada {{Newfoundland-geo-stub