Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)

History Two years after SIMONY (1850) discovered the type locality over Hallstatt, SUESS (1852) gave the name of the formation as "Hierlatz Schichten". In the same year, REUSS (1852) already published the first two gastropod species {ßuomphalus orbis n. sp. and Euomphalus excavatus n. sp.) from the same outcrops. In the next year, HÖRNES (in: HAUER 1853) described 23 additional gastropod species from the fauna of the type locality; 14 of them were new and nine were thought to be identical with species that had already been known from the Jurassic sediments of the (western) European epicontinental seas. HÖRNES's (1853) contribution did not give depictions, however, several years later STOLICZKA (1861) provided most of these species with figures while sometimes also reinterpreted them. SCHAFHÄUTL (1854) also published some of his 13 gastropod species from the Hierlatz Limestone as new ones, but most of their descriptions and figures were unsatisfactory for subsequent identifications. Most of the Hierlatz Limestone gastropod species became well-known from STOLICZKA's (1861) paper. He studied collections not only from the Hierlatz Alpe exposures but also from the Gratzalpe (today: Kratzalm) and Schafberg localities. He raised the number of the gastropod species from the Hierlatz Limestone Formation up to 54. After STOLICZKA's (1861) publication, only few systematic works provided new pieces of information about the gastropods from the Hierlatz Limestone Formation for more than hundred years. In this period, BÖCKH (1874) introduced the first species, ""Turbó" multistriatus n. sp., from a Bakony Mts (Szentgál, Hungary) locality; VON AMMON (1892) gave new name for one of the most frequent Hierlatz Alpe species (Eugclomphalus hierlat^ensis) that had been misidentified by STOLICZKA (1861) as Trochus cupido D'ORBIGNY, 1853 (that is the type species of Huyclomphalus AMMON, 1892). In faunal lists, some further authors added new data also to the distribution of the gastropods in other Hierlatz Limestone localities, but without detailed taxonomical proofs. Disregarding BÖCKH (1874) above mentioned single species description, SZABÓ (1979, 1980, 1981, 1982, 1983, 1984 and 1995) published the first detailed systematical data of the Hierlatz Limestone gastropods from the localities of the Bakony Mts (Hungary). Some small parts of the material, on which these publications are based, have been possibly listed by earlier authors, but no documentation of this relation has been found. Localities, material The major part of the material of this revision has been collected in the type locality of the Hierlatz Limestone Formation that can be found at the northernmost edge of the Dachstein Plateau, on the Feuerkogel, a peak of the Hierlatz Alpe, just over Hallstatt (Salzkammergut, Austria, see Figure 1). In the type locality area, the Hierlatz Limestone occurs mainly as Sinemurian infilling of a complicated and extended, multi-phased fissure system of the "underlaying" Upper Triassic Dachstein Limestone. From the Hierlatz Alpe gastropods, the material that had been available for STOLICZKA (1861) was the most important target of the present revision. He studied the collection, stored in the K. k. geologische Reichsanstalt (today Geologische Bundesanstalt, Vienna); indirect evidences suggest that HÖRNES (1853) also used the same material or its parts. This material consists of two parts: the carefully saved "originals collection" contains the "models" to the drawings, and the more abundant "background collection" that became slightly mixed probably during the Second World War rescue. It seems certain that the main part of the latter material have been also available for STOLICZKA because many specimens in both collections are marked by a code system that have probably documented the collecting points in the field (unfortunately the key for this code system has not been found). Obviously both collections contain syntypes of STOLICZKA's (1861) species, and presumably include also those of HÖRNES's (1853) species. Some boxes of undistinguished specimens in the "background" material probably, others surely (e.g. the institution name written as "Geologische Bundesanstalt" on the label) do not belong to the type collection. The Hierlatz Limestone of the type locality is regarded as belonging to the Upper Sinemurian (Oxynotum Zone). Recent field works at the type area resulted in recognition of some lithological variations of the Hierlatz Limestone, sometimes with inferable age differences but these can not be well traced in the studied museum collections. STOLICZKA (1861) indicated also the Hof Mineralien Cabinet (ancestor of the Namrhistorisches Museum, Vienna) as one of the depositories of the studied materials, but no information has been found if the rich Hierlatz Alpe material of this museum belonged to the type collections or not. However, this museum is the depositor}

7 for the type specimens, collected in the Schafberg area (over St. Wolfgang, W—NW from Bad Ischl, Austria; see Figure 1). Quite exactly, in this area two rather different lithological types contained Jurassic gastropods, but only a few specimens are saved from the typical, Sinemurian Hierlatz Limestone that outcrops in large areas of the Schafberg. Most of the syntypes belong to a small collection from an Upper Pliensbachian limestone, rich in micrite (atypical for the Hierlatz Limestone) and the fossils are frequently coated with black Fe-Mn-oxide layer. STOLICZKA (1861) regarded also this lithological type as Hierlatz Limestone. While the typical Hierlatz Limestone occurs in stratified ("hillfoot" deposited) form in the Schafberg area, its atypical variety found as infilling of a huge vertical fissure