The Östersund/Lake Storsjön area is herein divided into a western and eastern part, with the Upper Ordovician Kyrkås Quartzite Formation cropping out to the east and northeast (Fig. 11). A detailed analysis of this formation is presented from Nifsåsen Quarry (701350/144325, Swedish National Grid), 5.5 km NNE of Östersund, with comparisons to the successions at the nearby Ljusberg, Rannåsen and Storhögen quarries (Fig. 11). Nifsåsen Quarry exposes a 90 m thick succession of siliciclastic sedimentary rocks previously not described. The Kyrkås Quartzite Formation represents Late Ordovician deposition, and may contain almost the entire Hirnantian interval.

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