The map of museums and cultural attractions on the city of Tucson's Rio Nuevo site west of Downtown took more definite shape today.

There is an agreement between the city and the University of Arizona to build a combined Science Center and Arizona State Museum on the east side of the complex, along the Santa Cruz River. Earlier plans called for separate facilities.

The City Council still has to approve that $130 million expenditure.

The Tucson Children's Museum, which recently did a study jointly funded by the city to determine its future, will, based on that study, build a $20 million, 40,000 square-foot museum at the site, according to its board president, Michael Luria.

The Arizona Historical Society, which has expressed its desire to build a Rio Nuevo museum since before the project was even approved by voters eight years ago, will join the Children's Museum on the west side of the site, in a 135,000 to 140,000 square-foot building, said Bill Ponder, the Historical Society's chief administrative officer.