Examples from the Web for abyssal
No other mountains in the world are at once so continuously lofty and so near a coast which drops off to abyssal depths.The Andes of Southern Peru|Isaiah Bowman
All are dark in color, brown, blue or violet marking the abyssal species.Zoology: The Science of Animal Life|Ernest Ingersoll
The known deposits all point to shallow waters of epicontinental seas; no abyssal formations have been recognized.
Some of the limestones are made of Foraminifera, together with Radiolaria, and indicate a subsidence to abyssal depths.
A third haunt of life is the floor of the Deep Sea, the abyssal area, which occupies more than a half of the surface of the globe.The Outline of Science, Vol. 1 (of 4)|J. Arthur Thomson