a volcanic field
... that a volcanic field in Death Valley formed only about 2,100 years ago?
... that <b id="mwBZM"><a href="./Ubehebe_Craters" id="mwBZQ" rel="mw:WikiLink" title="Ubehebe Craters">a volcanic field</a></b> in <a href="./Death_Valley" id="mwBZU" rel="mw:WikiLink" title="Death Valley">Death Valley</a> formed only about 2,100 years ago?