The existence of such a "barrier-formation,"** as indicated above, probably resting on a line of reef similar to the one near Cape Discovery, would account for the presence of this ice-field in practically the same position as it was seen by D'Urville in 1840.
** An analysis of the data derived from the later voyages of the
'Aurora' makes it practically certain that there is a permanent obstacle
to the westerly drift of the pack-ice in longitude 137 degrees E. There
is, however, some uncertainty as to the cause of this blockage. An
alternative explanation is advanced, namely, that within the area
of comparatively shallow water, large bergs are entrapped, and these
entangle the drifting pack-ice.
At a distance, large bergs would be undistinguishable from shelf-ice, appearances of which were reported above.
Quoting further: "We were unable to see any trace of the high land reported by the United States Squadron (1840) as lying to the west and south beyond the compact ice.
"At 1.30 A.M. on the 23rd the pack-ice was seen to trend to the south-west. After steaming west for twenty-five miles, we stood south in longitude 182 degrees 30' E, shortly afterwards passing over the charted position of Cote Clarie. The water here was clear of pack-ice, but studded with bergs of immense size. The great barrier which the French ships followed in 1840 had vanished. A collection of huge bergs was the sole remnant to mark its former position.
"At 10 A.M., having passed to the south of the charted position of D'Urville's Cote Clarie, we altered course to S. 10 degrees E. true. Good observations placed us at noon in latitude 65 degrees 2' S. and 132 degrees 26' E. A sounding on sand and small stones was taken in one hundred and sixty fathoms. We sailed over the charted position of land east of Wilkes's Cape Carr in clear weather.
"At 5.30 P.M. land was sighted to the southward—snowy highlands similar to those of Adelie Land but greater in elevation.
"After sounding in one hundred and fifty-six fathoms on mud, the ship stood directly towards the land until 9 P.M. The distance to the nearest point was estimated at twenty miles; heavy floe-ice extending from our position, latitude 65 degrees 45' S. and longitude 132 degrees 40' E., right up to the shore. Another sounding realized two hundred and thirty fathoms, on sand and small stones. Some open water was seen to the south-east, but an attempt to force a passage in that direction was frustrated.
"At 3 A.M. on the 24th we were about twelve miles from the nearest point of the coast, and further progress became impossible. The southern slopes were seamed with numerous crevasses, but at a distance the precise nature of the shores could not be accurately determined."
To this country, which had never before been seen, was given the name of Wilkes's Land; as it is only just to commemorate the American Exploring Expedition on the Continent which its leader believed he had discovered in these seas and which he would have found had Fortune favoured him with a fair return for his heroic endeavours.