In their morphological characters they gradually approach the pelagic forms upwards and the abyssal downwards.
Dimya; recent in abyssal depths and fossil since the Jurassic.
Such a rock is necessarily oceanic; but more than this, it is abyssal.
No other mountains in the world are at once so continuously lofty and so near a coast which drops off to abyssal depths.
They are the summits of very lofty mountains which have their bases in an abyssal ocean.
Some of the limestones are made of Foraminifera, together with Radiolaria, and indicate a subsidence to abyssal depths.
Oceanic islands are those, usually very small, found in the midst of the ocean, with abyssal depth all about.
All are dark in color, brown, blue or violet marking the abyssal species.
When Dr. Morton said there were abyssal fish in the lagoon, I knew why they'd be there.
The known deposits all point to shallow waters of epicontinental seas; no abyssal formations have been recognized.