a city in 1950, when it became a separate municipality from Nyköping. Stenungsund is one example of a municipality that, having no historic city arms, created wholly new arms in the 1970s. This device, displaying a hydrocarbon molecule, alludes to the area's petrochemical industry, and is also an example of distinctly modern arms. The arms, registered with the PRV in 1977, display: Argent, a hydrocarbon molecule of three pellets conjoined with six bezants gules, over a base wavy azure. Mullsjö Municipality was newly created in 1952. The coat of arms, granted in 1977, was proposed by the municipality's recreation committee, to market the municipality as a center for winter sports. The snow crystal is a relatively modern charge, and the modern tree-top line, called kuusikoro in Finnish, is reflective of the Finnish influence on Swedish heraldry. Blazon: Azure, a snow crystal argent beneath a spruce-top chief of the same. Krokom Municipality was formed in 1974 and bears arms granted in 1977, featuring a ram (gumsen) based on a 6000-year-old rock carving at Glösabäcken. The ram seen here was included in the seal of the legislature of Rödön from 1658. While petroglyphs long predate heraldry, they rarely appear in heraldic armory. Blazon: Argent, a chevron gemel wavy inverted and diminished azure, beneath a ram in the manner of a rock carving gules. Ecclesiastical heraldry The Church of Sweden (Svenska kyrkan) is the national church (folkkyrka) and, until 2000, was the state church (statskyrka) of Sweden. The arms of the church have been found displayed on a 14th-century heraldic flag discovered in Uppsala cathedral, and are blazoned: Or, upon a cross gules, a crown Or. The crown has long been said to represent St. Erik, but in early 2005, the church issued a press release adopting "a new interpretation of the 600-year-old coat of arms which was found in Uppsala cathedral," calling it the victory crown of Christ (Kristi segerkrona). The Church of Sweden also has many dioceses and parishes with their own coats of arms. According to tradition, bishops may use the arms of their diocese marshalled with their own personal arms, with a mitre in place of the helmet and a crosier displayed behind the shield, but these are removed when the bishop retires. These arms may take the form of a shield divided per pale or quartered with the arms of the diocese in the first and third quarters