DOLOMITES - Annexes 2-8 - Provincia di Udine

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NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 68 Rosso Ammonitico and the drowning of the platform Little by little the sea took over, also thanks to a spectacular sinking that in the course of a few dozens of millions of years took the seabed to more than 1,000 meters from the water surface. The Trento Platform was completely submerged and transformed into a high pelagic plateau. A very fine sediment was deposited at the bottom of this abyss at a quite reduced rate: less than one millimeter every one thousand years. These sediments are known as Rosso Ammonitico. This formation lays on the Calcari Grigi Gp. or on the Fanes Piccola Encrinite, through the interposition of a hard ground, and can be usually subdivided into two members: The Lower Rosso Ammonitico and the Upper Rosso Ammonitico, are divided by an hardground surface (Clari et alii, 1983). The basal hard ground, around 25-30 cm thick, comprises bright red limestones with ferrous-manganesiferous nodules and fossil concentrations (ammonite fragments, usually corroded, belemnite rostrums and crinoid articles). Inside can be seen stromatolitic domes impregnated with oxides, cut by erosive surfaces and microperforated, and identifiable as deep microbialites (Winterer & Bosellini, 1981). The Lower Rosso Ammonitico comprises pink to red nodular limestones rich in pelagic lamellibranchs (‘Posidonia alpina’ Auct.) and protoglobigenirids, in thin strata with marly interbeddings at the base, in meter sized packs amalgamated toward the top. Those are packstone-grainstones in which the pelagic bivalves are associated with peloids, intraclasts, echinoderm fragments and large bivalves, foraminifers, rare radiolarian and Globochaete alpina. In many cases an intense bi oturbation is evident, but occasionally a primary iso-orientation of the elongated grains can be recognized. Ammonites and belemnites characterize the macrofauna. Ammonitico Rosso The Upper Rosso Ammonitico is separated from the underlying unit by a hard ground, less evident and thinner than the basal one (5-10 cm), distinguished by the presence of small ferrous- manganesiferous nodules. Alternatively, on a local level, in the more southern areas, the separation between the two members is ascribable to an interval of a few decimeters to several meters of thickly stratified red marls (Fonzaso Formation). The Upper Rosso Ammonitico comprises at its base pink micritic limestones with radiolarians and ammonites, intercalated with dark red encrinitic limestones. These are wackestones and subordinated packstones with Saccocoma sp. and fragments of other echinoderms, Globochaete alpina, peloids, radiolarians, aptichs, sections of small ammonites, foraminifers, pelagic bivalves and rare lithoclasts, often limonitized. There are also stromatolitic domes and one can observe weak, oblique, low-angle laminations evidenced by the alternating packstones and wackestones. The stratigraphically higher lithotypes comprise tintinnid wackestones or wackestone-packstones (among which, Calpionella alpina, indicative of Titonian), with associated radiolarians, foraminifers, echinoderm remains, aptichs, rare mica blades indicate the passage to the facies typical of Biancone or Maiolica. The drowning of the Trento Platform caused the whole Dolomites area from the Jurassic to the whole Neogene to become a deep hemipelagic basin. Only the
NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 69 Ammonitico Rosso eastern areas of the Friuli Platform still continued to remain in a photic zone and thus maintain the status of a productive carbonate platform throughout the Cretaceous. Resedimented deposits from this platform such as the Vajont Limestone are present in the Belluno Basin and cover large parts of the drowned platform.
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Provincia di Belluno Provincia Auto
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ANNEX 2 A2.1 GEOLOGY A2.2 FLORA AND
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ANNEXES NOMINATION OF THE DOLOMITES
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NOMINATION OF THE DOLOMITES FOR INS
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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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159 160- 161 NOMINATION OF THE DOLO
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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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