text: But southern parts of its course must be much younger because the areas where the Finke now flows near the southern edge of the Northern Territory , and further south , were under the sea during the Mesozoic Era , part of the Great Artesian Basin .
simplified: The southern parts of its course must be much younger because the areas where the Finke now flows near the southern edge of the Northern Territory , and further south , were under the sea during the Mesozoic Era , part of the Great Artesian Basin .