This map - the 22nd and last in a major series of regional geological maps, the others involving parts of New Zealand itself - have been produced by GNS scientists since 1993.
It covers 84,600sq km, about a seventh of the land area of the Ross Dependency, following on from an earlier New Zealand-generated map of part of the region, covering 62,500sq km.
''I'm grateful and pleased that we can enjoy the benefits of such a wonderful digital resource,'' Dr Cox said.
Dr Cox said the map could not have been produced without the help ''of many, many people and organisations'', including his team of compilers, and Antarctica New Zealand.
Contributions from the GNS Science Dunedin office had also been crucial, including from Ian Turnbull, who had initiated the project, as well as from Belinda Smith-Lyttle and Jane Forsyth.
The latest map is the second edition of an earlier geological map of southern Victoria Land undertaken by Otago geology graduate Bernie Gunn and Wellington scientist Guyon Warren in the late 1950s and early 1960s.
Key field work for the earlier map was undertaken during 1957-58 International Geophysical Year. The fieldwork needed to complete the latest map was undertaken 50 years later, during the International Polar Year, by Dr Cox and colleagues, in late 2007.
The most demanding part of the project had not actually been the eight weeks of further Antarctic fieldwork, but having ''the stamina necessary to complete the office work''.
The new edition contained much more detail - about 195 different rock and ground classifications, compared with 15 such groupings in the earlier edition.
And the new work drew on information from the earlier map, and added observations gleaned from 189 scientific papers published since. Suggestions from more than a dozen specialist external reviewers had also been added.
Dr Cox remained ''in awe of the achievement'' of the two earlier scientists.
The researchers in the 1950s had to undertake their own surveying by climbing mountains, and had undertaken a 1500km dog-sled journey which was ''impressive'' in itself, let alone doing science and geology along the way.
By contrast, the new edition had benefited from aerial and satellite-based topographic surveys, and much more logistic support, as well as computer technology, he said.
