They have wide craters and are formed of highly altered, thickly bedded tephra, they are considered to be a taller variant of a "tuff ring".
They are considered to be a taller variant of a "tuff ring". They have wide craters and are formed of highly altered, thickly bedded tephra.
They have wide craters and are formed of highly altered, thickly bedded tephra. They are considered to be a taller variant of a "tuff ring".
They have wide craters and are formed of highly altered, thickly bedded tephra. They are considered to be a taller variant of a "tuff ring".