The Cassini RADAR team has a new paper by Elachi et al. in the June 8, 2006, issue of Nature. See the http://www.nature.com/nature/journal/v441/n7094/edsumm/e060608-11.html for more information.
Interesting. They interpret the smooth material at the core of Omacatl Macula as being a part of their "Mottled Dark unit". This is the same unit in Ta that has been interpreted as being due to possible surface liquids or playas. Not sure I agree with Omacatl being an area with surface liquids, but okay...
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