摘要：A rich assemblage of various marine taxa from the lower Carnian Polzberg
Konservat-Lagerstätte near Lunz am See (Northern Calcareous Alps, Lower Austria) is described for the first time in detail. The fossiliferous layers were deposited during the Julian 2 Ib (
Austrotrachyceras austriacum Zone,
Austrotrachyceras minor biohorizon). The fine-laminated Reingraben Shales comprise abundant and well-preserved members of the marine Carnian food chain. Invertebrates with the bivalve
Halobia, the ammonite
Austrotrachyceras and the coleoid
Phragmoteuthis dominate over vertebrate actinopterygian fishes. Fragile groups such as polychaetes and isopods are entirely preserved as soft body fossils. The diverse assemblage comprises ammonites (
Austrotrachyceras,
Carnites,
Sageceras,
Simonyceras), coleoids (
Phragmoteuthis,
Lunzoteuthis), bivalves (
Halobia), gastropods (caenogastropods/heterobranchs), one echinoid, thylacocephalan arthropods (
Austriocaris), crustaceans (the decapod
Platychela and isopods such as
Obtusotelson,
Discosalaputium), polychaetes (
Palaeoaphrodite sp., eunicid polychaete), acytinopterygians (
Saurichthys,
Polzbergia, Peltopleurus, Habroichthys), cartilaginous fishes (
Acrodus), coelacanth fish (
“Coelacanthus”), a lungfish (
Tellerodus), and a conodont cluster (
Mosherella). Regurgitalites produced by large durophagous fish and coprolites produced by piscivorous actinopterygians accompany the Polzberg palaeobiota along with rare plant remains (
Voltzia). The entire fauna of Polzberg and the excellent preservation of the specimens present a window into the Upper Triassic assemblage and palaeoenvironment during the so-called Carnian Pluvial Episode (CPE) in the early Mesozoic. The occurrence of the freshwater lungfish
Tellerodus and the branchiopod
Eustheria, a member of brackish to freshwater environments, points to the influence of occasional freshwater pulses or sediment transport events on the marine environment. The Polzberg palaeobiota was deposited during the global CPE, triggering the environmental conditions of the Polzberg Basin and resulting in the formation of the Reingraben Shales with the Polzberg
Konservat-Lagerstätte.
