Access and Information
Blábjörg is located on the northern side of Berufjörður, a short distance east of the farm Fagrihvammur. There is a parking area by the Ring Road, with a path leading down to the shore. Blábjörg is an easily accessible site for viewing ignimbrite and is a popular stop for visitors.
An agreement is in place with the owners of Fagrihvammur regarding the management of the natural monument.
Interpretations
Blábjörg forms part of a welded rhyolitic tuff layer, or ignimbrite, known as the Berufjörður acid tuff. In the geological sequence, it lies just above the so-called Hólmatindur tuff, which contains lignite, and some distance below a pink tuff layer associated with Skessa.
The Berufjörður acid tuff can be traced along the mountains to the northeast and is particularly prominent at Berunestindur. It has not been found south of Berufjörður.
The ignimbrite was formed by a pyroclastic flow during an explosive rhyolitic eruption. It consists mainly of welded rhyolitic pumice, although fragments of basalt are also present. The mineral chlorite formed through alteration of the rock and gives it its characteristic greenish hue.
Protection status
The area was designated as a natural monument in 2012. The protected area covers 1.49 hectares. The purpose of designating Blábjörg as a natural monument is to protect its distinctive geological formations, which are of significant educational and scientific value.