Coastal part of the Gulf of Pag at the Pag island, north of Crnika, is covered with outcrop in height up to 5 m made of alternation of layers of clay, sand and gravel, evidently rich in fossils as determined by the field analysis, where two sedimentological columns with marked layers and sampling depth have been made. Fieldwork and laboratory analysis found that the marine and land organisms are appearing in the same strata layers which indicates a change of environment, and also that the majority of the fossil record are of marine origin, with microfauna redeposited from the surrounding older strata while the origin of recent macrofauna remains unexplained. The discovery of Roman era glass and ceramics probably from the nearby Roman settlement Cissa, today known as Caska, which mysteriously dissapeared, together with the anomalic marine and terigenic fossils could indicate that the area was hit by a sudden and abrupt event like a storm or a tsunami. Considering the absence of historic record as well as no traces of previous constructions and the size of the recent marine organisms, the more probable cause is a tsunami, although the cause and the source of a tsunami remains unexplained, as well as its entry path in the Gulf of Pag.