A five-year moratorium on fracking in Boulder took a step toward the November ballot Tuesday night.

The Boulder City Council unanimously gave initial approval to a ballot measure that would ban fracking through 2018 unless, after June 2016, a two-thirds majority of the City Council decides it should be lifted.

Some City Council members said the moratorium should extend five years from the end of the one-year moratorium adopted by the council last month, ratther than converting the one-year moratorium into a five-year one. That would extend the moratorium through 2019 unless the council signed off in 2017.

The City Council will consider the date changes at a second reading of the ballot measure on a special meeting Aug. 5.

If the state Supreme Court ultimately rules against Longmont's voter-approved fracking ban, the City Council could simply not enforce Boulder's moratorium, City Attorney Tom Carr said.