DOLOMITES - Annexes 2-8 - Provincia di Udine

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NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 54 Sedimentation continued bed after bed in the basins that separated these reefs, originating from the erosion of vulcanites and from the precipitation of carbonates exported from the platforms (S. Cassiano Formation). This formation, world famous for its fossiliferous content, was originally named Cassianer Schichten by Münster (1834), from which the name San Cassiano Beds derives, used in Italian geologic literature and geologic cartography. The San Cassiano Formation is very well represented within core and buffer areas; some areas, such as Prati di Stuores, the area of Sett Sass, the surroundings of Cortina d’Ampezzo, the area of Picco di Vallandro/Dürrenstein, the Forcella Giau (to quote just a few), are famous for the noteworthy fauna fossils, known by the scientific community thanks to numerous paleontologic writings produced from the second half of the 1900s mainly by German speaking researchers, as well as the patient work of R. Zardini in more recent times. Panoramic view of Giau Pass. Notice the contrast between the green fields grown on basinal and fine sediments (WEN-SCS) and the high and rocky cliffs of La Gusella (Cassian Dolomite). The San Cassiano Formation comprises a complex of alternating pelites, marls, pure to marly micrites, oolithic calcarenites, bioclastic and oncolithic calcarenites and calcirudites. Carbonate lithotypes are mixed in various proportions with sandstones of volcano-detritic origin and produced by the erosion of the crystalline basement, probably exposed in the emerged areas situated to the south of the current Valsugana Line. Hybrid arenites are extremely frequent, with a mixed carbonate-terrigenous composition, which would imply a mixing of the two components in shallow water before resedimentation in the basin. The dominant are light gray and yellowish in color. The arenite strata present thicknesses between centimeters and decimeters, while the fine parts are present both in sets from dozens of centimeters to meters and as thin interbedding between the arenite layers. The depositional structures exhibited by the arenites (erosional base, direct gradation, plane-parallel lamination, current ripples, flute-casts, absence of evident wave structures) are indicative of turbiditic transport with episodes of debris-flow and slumping. The San Cassiano Formation is, at least in the mid to upper parts, dominated by the carbonate component originating from the prograding platforms, even when the siliciclastic import does not decrease. Near the platform areas, the Formation is clearly organized in cycles of coarsening-up/thickening-up (CU/TU) facies of various thicknesses from a few meters to a little over 10 meters (Masetti et alii, 1991), that is lost in the more central basin areas. The more proximal CU/TU cycles end with carbonate olistolith swarms deriving from the external margin of the platforms (‘Cipit Limestone’ Auct.). In the eastern sector (far from the contemporary carbonate platforms) and in the southern sector (closer to the siliciclastic coastline), the terrigenous fraction can dominate the carbonatic one. The S. Cassiano Formation is indicated to be Upper Longobardian, and to most lower Carnian Stages (Julian according to Krystyn, 1978) on the
NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 55 basis of a rich ammonoid fauna (Urlichs, 1974, 1994; Bizzarini et alii, 1986; 1989; Bizzarini & Braga, 1987; De Zanche & Gianolla, 1995; Mietto & Manfrin, 1995a,b). The unit, as has been stated, contains also a great quantity of benthic fossils (bivalves, gastropods, echinoderms), for the greater part rearranged from nearby Cassian platforms together with a great variety of metazoan builders remains (corals, stromatoporids, sphinctozoans) and, to a lesser extent, representative of the autochthonous basin communities. Settsass and Piccolo SettSass (Richtofen Reef) View of a spectacularly well preserved relationship between the slope downlapping on the correlated basin sediments at LaVarella-Cunturines.
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Provincia di Belluno Provincia Auto
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ANNEX 3 A3.1 LETTERS OF SUPPORT
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Systems: 1. Pelmo - Nuvolau 2. Marm
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visitors NOMINATION OF THE DOLOMITE
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others (malghe, alberghi, ristorant
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mountain cabins others (malghe, alb
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visitors footpath NOMINATION OF THE
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ANNEX 5 A5.1 PROTECTIVE DESIGNATION
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11. NOMINATION OF THE DOLOMITES FOR
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49. 50. 51. NOMINATION OF THE DOLOM
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ANNEX 7 A7.1 DVD (PHOTOGRAPHS) A7.2
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fauna NOMINATION OF THE DOLOMITES F
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ANNEX 8 A8.1 OTHER LOCAL AUTHORITIE
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DOLOMITES - Annexes 2-8 - Provincia di Udine

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