Marin County supervisors took another step forward in the contentious purchase of the San Geronimo Golf Course on Tuesday, bringing in a third-party operator to run the golf course on a two-year contract and, separately, accepting grant funds to use for the planning process. 

Touchstone Golf, a Texas-based company that operates a number of public courses in the Bay Area, plans to open the course as soon as April 14. The company, whose two-year contract…