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A variety of buildup types occur in the upper Paleozoic Auernig and Rattendorf Groups, Carnic Alps, at the present-day Austrian–Italian border, including coral, diverse algal (Anthracoporella, Archaeolithophyllum, Rectangulina, and phylloid green), bryozoan, brachiopod, and sponge buildups. Thin mounds and banks have a diverse fossil association (e.g., Archaeolithophyllum–bryozoan– brachiopod mounds) and occur in siliciclastic-dominated intervals, as do coral buildups. Some of the biodiverse thin mounds occur in strata that were deposited in cooler water. However, the thickest mounds are nearly monospecific (e.g., Anthracoporella mounds) and grew in carbonate-dominated, warm-water environments. Most of the mounds considered in this paper, particularly algal mounds, grew in quiet-water environments below wave base but within the photic zone. Mound growth was variously stopped by siliciclastic input, e.g., auloporid coral mounds, sea-level rise, e.g., the drowning of Anthracoporella mounds of the Rattendorf Group, influence of cool water, e.g., algal mounds of the Auernig Group overlain by limestone of cool-water biotic association, or sea-level fall, e.g., phylloid algal mounds that were subsequently exposed subaerially. There is no indication of ecological succession during mound growth. Growth, dimensions, biotic association, and termination of mounds seem to have been controlled by extrinsic factors, mainly sea level and water temperature. Phylloid algal mounds are similar to those described from other late Paleozoic settings. Auloporid coral buildups, and Rectangulina and Anthracoporella algal buildups, however, have not previously been reported from other regions, although these fossils are described from several localities outside the Carnic Alps. Permo-Carboniferous Carbonate Platforms and Reefs SEPM Special Publication No. 78 and AAPG Memoir 83, Copyright © 2003 SEPM (Society for Sedimentary Geology), American Association of Petroleum Geologists (AAPG), ISBN 1-56576-087-5, p. 201–217. INTRODUCTION Carbonate mounds are common features in upper Paleozoic rocks (Auernig and Rattendorf Groups) in the Carnic Alps, (part of the Southern Alps at the Austrian–Italian border (Fig. 1). Mounds from distinct formations of the Auernig and Rattendorf Groups have been described previously, but a review of the overall buildups is lacking. Boeckelmann (1985) and Krainer (1995) reported algal mounds in the Meledis and Auernig formations, respectively, from the Auernig Group. Flügel and Krainer (1992) reported coral mounds from the Meledis Formation, Auernig Group. Flügel (1987) described Anthracoporella algal mounds from the Lower Pseudoschwagerina Limestone, Rattendorf Group, and Samankassou (1998) pointed out the constructional mode of Anthracoporella in the Carnic Alps. The present paper reviews different buildup types within the Auernig and Rattendorf Groups, including those in intervals from which mounds are reported for the first time (Fig. 2). For the

Upper Carboniferous-Lower Permian Buildups of The Carnic Alps, Austria-Italy