https://www.msn.com/en-us/money/realestate/petrified-forest-in-calistoga-goes-on-sale-after-100-year-ownership-by-same-family/ar-AA1elZvU?ocid=hpmsn&cvid=6e6dbba4ce4c427ebdb195f89bbd0cec&ei=298
i dont know if this qualifies as a mountain, certainly not an island