Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)

Microfacies 4: Echmoderrn-spicula-biomicrite with forams and ostracods (wackestone) (Plate I: 5-6) — The main biota consists of echinodermal remains and spicula (each 15-20%). Besides ostracods, foraminifers also occur; they are represented by Trochammina alpina KRISTAN-TOIJJVIANN, Ammobaculites sp., Aeolisaccus sp., Ophthalmidium leischneri KRISTAN—

TOLLMANN, Nodophthalmidium sp., Trocholina turns FRENTZEN and nodosariids and lagenids are also common but unidentifiable in thin-section. Of special interest, there are large sponges up to several cm, regarding their fragments. The interspace of the spicula-meshwork is filled by micritic peloidal-packstone. Especially in sample SBB 1 stromatactis-cavities are frequent, that are filled either with blocky calcite or sometimes even with peloidal packstone, the latter one often surrounding also these cavities. Microfacies 5: EcMnoderm-forarninifera-biomicrite with (wacke- to packstone) (Plate I: 8, Plate II: 1-8) — This lithofacies is characterized by a high amount of FeMn-crusts, mosdy in mm-scale, but sometimes up to several centimetres thickness. The crusts are sometimes bored, or associated with ammonites or serpulids (Plate II: 3-4). The "normal-sediment" can often be classified as echinodermforarriinifera-biomicrite (wacke- to packstone) with variable amount of echinoderms (10-30%) and forams. The stronger the degree of condensation, the higher the amount of foraminifera (Plate II: 1—2). Involutinids are dominant. In these sediments, there are several intercalations of resediments (Plate II: 5—6). Sometimes, as in sample SBM 8 (Plate II: 8), multiple fracturing of the sediment can be observed. Short notes on micropalaeontology The taxa found in our material are mosdy well-known, so the reader is referred to the work of BÖHM et al. (1999) and EBLI (1997), where detailed descriptions and synonymy are provided (see also Plate III). The predominant involutinids exhibit a high variability

7 that is shown as an example for Trocholina umbo. The finding of Licispirella bicarinata BLAU is specially interesting because this species has been known only from the Hettangian to the Upper Sinemurian (EBLI 1997), that indicates presence of the Adnet-Type Limestone also in the Lower Jurassic. The specimen of Nodophthalmidium sp. figured in plate Plate III: 13 exhibits the characteristic spirally wound initial part. Miliolidae gen. et sp. indet., figured on Plate III: 16 may be a member of a new genus, that resembles to the genus Nodophthalmidium in its initial part, but has crescent shape chambers in its adult stage instead of pyriform ones. Bivalves In his pioneering work on the gastropod and bivalve fauna of the Hierlatz Limestone of the Northern Calcareous Alps STOLICZKA (1861) listed Schafberg as one of the three most important localities. Collecting work carried out in the last years in the area has yielded some 70 bivalve specimens as well. The material, which was mosdy collected according to lithostratigraphic units, has made the recognition of the stratigraphical distribution of bivalves in the Lower Jurassic of Schafberg possible. Bivalve assemblage of the Sinemurian Hierlatz Limestone of the Schafberg is much less diverse than that of the type locality and consists exclusively of epifaunal taxa. Shallow burrowing heterodonts, forming more than one third of the specimens of the Hirlatzwand-assemblage (SZENTE 1996a) are strikingly lacking. Representatives of Praechlamys are relatively frequent in the Lower Jurassic of the Schafberg. Three species, all introduced by STOLICZKA (1861), have been found. The abundance of Praechlamys rollei encountered at the Schafberg recalls the composition of some Late Pliensbachian assemblages of the Bakony Mts (Hungary), especially that of the fauna from the fissure-filling of the Margaritatus Zone once exposed in a former manganese-ore mine at Eplény (SZENTE 1996b). The bivalve taxa identified are listed with indication of the stratigraphie level of occurrence(s). The systematic composition of the fauna is the following (the wellpreserved specimens are shown in Plate IV): Explanation to Plate III 1 Globochaete alpina LOMBARD — Sample SBM 3, x40. 2 Trochammina alpina KRISTAN-TOLLMANN — Sample MS 1, xl44. 3 Textularia sp. — Sample SBM 1, x280. 4-5 Involutina hassica (JONES) — 4: Sample SBM 5, x98; 5: Sample SBM 3, x98. 6 Licispirella bicarinata (BLAU) — Sample SBM 10, Xl08. 7 Trocholina turris FRENTZEN — Sample SBB 1, x90. 8-12 Trocholina umbo FRENTZEN — 8: Sample SBM 10, X90; 9: Sample SBM 5, x75; 10: Sample SBM 3, x90; 11: sample SBM 1, x94; 12: Sample SBM 5, x64. 13 Nodophthalmidium sp. — Sample MA 1, xl 10. 14 Ophthalmidium leischneri (KRISTAN-TOLLMANN) — Sample SBM 5, xl63. 15 Ophthalmidium martanum (FARINACCI) — Sample SBM 4, xl40. 16 Miliolidae, gen. et sp. indet. — Sample SBM 2, xl30.