At some places in southern Sweden outcrops are found of a peculiar, conglomerate-like rock consisting of dolerite with numerous pebbles of mainly quartzite. The latter belong to the Jotnian Almesåkra series, and the occurrences of the conglomerate-like rock are a criterion that this series earlier has had a much wider distribution than now and covered large parts of southern Sweden. The two best occurrences of this peculiar rock are found at Brevik and Rödja in Småland. The present paper is the result of an examination of the conglomeratic rock at Brevik.