Two extensive olivine basalt flows covering 450 square km.
See also Gunnedah and Mullaley localities.
Refs.:
Mineralogical Record (1988), 394-397
Tschernich, R. (1992): Zeolites of the World, p.48
For comment, see
http://www.mindat.org/mesg-7-34670.html9 entries listed. 8 valid minerals.