TwENHOFEL. — Expedition to the Baltic Provinces. 



PLATE 6. 



Fig. 1. — ^ South side of Storo Karlso showing great variation of inclination 

 in the vicinity of small reef-hke masses of coral. 



Fig. 2. — Limestone conglomerate on the south side of Burgen Ridge, Gotland. 



Nearly all the pebbles are rounded and show great wear. A few 



years appear to suffice for the rock to disintegrate. The coral 



reef is in the heart of the ridge. The camera was held about 



three feet above the ground. - 



