Amber Event in the Early Eocene of the Lessini Mountains (northern Italy)

In Italy the amber has been reported since ancient times, especially from Tertiary rocks of the Northern Apennines and of the Sicily. From the Southern Alps, since recent times, the occurrence of amber has been cited only sporadically. During the last decade, more comprehensive descriptions of amber findings have been published. The occurrence of amber from the world-famous fossil-lagerstätte of Pesciara di Bolca (Verona province) is here reported for the first time (Trevisani et al., 2004). This amber has been carefully analysed by means of infrared spectrophotometry (FTIR), thermogravimetric analysis (TG), differential thermogravimetric analysis (DTG), and elemental chemical analysis. Then, the amber from Bolca has been compared with other ambers of similar age. Among them, a sample from the Cava Rossi quarry (Monte di Malo, Vicenza province) shows striking similarities in all the chemical-physical characters.The fossil content of the amber levels of the Pesciara and Cava Rossi was examined with respect to the palynomorphs and larger foraminiferans. This permitted to ascertain that the two amber levels are substantially isochronous, within the resolution power of the larger foraminiferan biozones. According to the shallow benthic biozonation, the age is in both cases SBZ 11, or Middle Cuisian (Early Eocene).Moreover, the fossil assemblages allowed to reconstruct the paleoenvironments, stressing they were in both case on a shallow carbonate platform, relatively close to the shoreline. The Pesciara palaeoenvironment was very close to the continental areas and with peculiar conditions allowing the exceptional preservation of the fishes. Instead, the Cava Rossi palaeoenvironment was more distal and open to marine influxes.The presence of amber, never reported before, in the Pesciara di Bolca increases the already abundant fossil documentation of this unique paleontological site. The presence of amber in Cava Rossi at Monte di Malo, about 15 km from Bolca, allows a correlation between the two sites and significantly contributes to increase the paleogeographical and paleoenvironmental knowledge.ReferencesTrevisani E., Ragazzi E., Roghi G. e Papazzoni C.A., 2004, Early Eocene amber from the "Pesciara di Bolca" (Lessini Mountains, Northern Italy, Lethaia (submitted).