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Updated: May 18, 2025
On the eastern end of this area, two parallel shoals, about 1½ miles across and having 50-fathom depths between them, rise from the 100-fathom depths of water over the muddy ground around them to reach 15 fathoms on the landward end of the rips, deepening to 35 fathoms off the western part, where the two ridges come together at about 9 miles distance from Briers Island, to carry on to the westward over the Flat Ground, which extends to a distance of about 18 miles from the island.
This Flat Ground, deepening gradually westward, averages to have 50 fathoms of water over a level, gravelly, and rocky bottom, to pitch down suddenly, as do all other slopes of this piece of ground, to the 100-fathom depth, which prevails on all sides of The Rips.
In fact, the 100-fathom line round New Guinea marks out accurately the range of the true Paradise birds.
Fairly good catches have been made SW from the Northwest Peak of Browns, about 66° 50' west longitude and 42° 40' north latitude, along the 100-fathom curve and following eastward to the southward of La Have and beyond, perhaps to 63° west longitude.
Another big ridge, paralleling the 100-fathom curve of Georges Bank at about 20 miles N. of it, lies SE by S from the buoy on Cashes Ledge, forty miles to its center; SE by S 110 miles from Portland Lightship; ESE 92 miles from Cape Ann to its western end, and E. by S. ½ S. from the ship at Boston 100 miles.
The general result therefore, at which we arrive, is that the great islands of Java, Sumatra, and Borneo resemble in their natural productions the adjacent parts of the continent, almost as much as such widely-separated districts could be expected to do even if they still formed a part of Asia; and this close resemblance, joined with the fact of the wide extent of sea which separates them being so uniformly and remarkably shallow, and lastly, the existence of the extensive range of volcanoes in Sumatra and Java, which have poured out vast quantities of subterranean matter and have built up extensive plateaux and lofty mountain ranges, thus furnishing a vera causa for a parallel line of subsidence all lead irresistibly to the conclusion that at a very recent geological epoch, the continent of Asia extended far beyond its present limits in a south-easterly direction, including the islands of Java, Sumatra, and Borneo, and probably reaching as far as the present 100-fathom line of soundings.
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