sentences:  Residual evidence of these ancient geological features appears in the form of scattered outcrops of basalt and rhyolite as well as local hot springs such as nearby Mortons Hot Springs and Agua Caliente Hot Springs.Some rock quarrying was historically conducted near Nunns Canyon Road in the upper Calabazas Creek watershed.Calabazas Creek originates about northeast of the town of Glen Ellen, California, just north of Trinity Road, at the top of Nunns Canyon.