Cathedral of Saint Helena Cathedral of Saint Helena The Cathedral of Saint Helena is the cathedral of the Roman Catholic Diocese of Helena, Montana. Modeled by architect A.O. Von Herbulis after the Votivkirche in Vienna, Austria, the construction began on the Cathedral in 1908, and held its first mass in November 1914. The Cathedral sustained significant damage during the 1935 Helena earthquake, which required extensive renovations. The Cathedral was added to the National Register of Historic Places in 1980. The site for the cathedral was purchased in 1905. A.O. Von Herbulis of Washington, D.C., was commissioned as the architect. Von Herbulis was trained abroad
Geology of Saint Helena Geology of Saint Helena The geology of Saint Helena resulted from the long-running volcanic activity of the Saint Helena hotspot. Most of the island was formed beginning 14 million years ago. Volcanism on the island ceased seven million years ago, leading to long-running erosion and the formation of deep, v-shaped valleys along with steep coastal cliffs. Some geochemists have observed significant trace element variations between South Atlantic islands and proposed that deep-ocean sediments may have mixed into the magma which formed Saint Helena. Saint Helena is comprised, almost universally of mafic basalts. The breccia and basalt lava flows of the