May a Catholic have thier cremated remains poured out at sea?

My mother, a Roman Catholic in good standing, passed recently and wished to be cremated and her ashes poured out at sea. A young priest at her parish, fresh out of seminary, indicated that such a thing goes against Catholic teaching while an older priest of 44 years in the same parish suggested not bringing the ashes to the memorial Mass and then doing whatever we wish. It was also suggested that the entire urn could be tossed into the ocean but sprinkling the ashes out is the part that is disallowed. What is the official Roman Catholic stance on: 1) Cremation 2) disposition of ashes at sea, particularly regarding sprinkling out of the urn