Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 94. (Budapest 2002)

Sziráki, Gy. ; Dulai, A.: Sarmatian (Late Miocene) arthropods from Tállya and neighbouring localities (Tokaj Mts, Hungary): preliminary report

Si0

2 content of the lakes was very favourable to the bloom of fresh water diatoms. Most of the dissolved Si0

2 was used to shell-building by diatoms. The microscopic shells of diatoms were deposited on the bottom of lakes in rock-forming quantity. Several diatomaceous formations, even some diatomaceous earth (diatomite) are known in the marginal areas of the Tokaj Mts. The most important occurrence is at Erdőbénye, but some smaller localities are found around Tállya as well. A part of the Si0

2 may form thin chert layers within the diatomaceous earth sequence. The diatomaceous layers are always white, mainly laminated and sometimes highly silicified. This formation contains more or less volcanic tuff at some places, because of the simultaneous volcanic activity. Most of the studied arthropod fossils came from the bedding surface of the diatomaceous sediments (Tállya: Dorgó-oldal; Tállya: Gomboska; Erdőbénye; Abaújszántó: Cekeháza). A few fossils were found in limnoquartzite (Rátka, Koldu). The accompanying fauna and flora consists of fish remains and leaf imprints at most localities. The macroscopic paleobotanical material was studied by ANDREÁNSZKY (1959) and recently by ERDEI (1995). The diatoms were sudied in several papers and a monograph by HAJÓS (e.g. 1959, 1978, 1986). MATERIALS AND METHODS The overwhelming majority of the examined material is housed in the collection of GYÖRGY ENCSY. A few rock samples with insect fossils are in the Hungarian Natural History Museum, while one of the studied fossils is property of the first author. The rocks, according to need, were moistened by water to improve microscopic examination. LOCALITIES AND FOSSILS Rátka: Koldu (H7) Insecta: Coleoptera: Dytiscidae - One specimen (Fig. 2) (CE). Dorsal surface of the insect is visible. Length of the body 35 mm. Insecta: Lepidoptera - One rather poorly preserved ventral imprint (Fig. 3) (CE). Both fore and hindwings are wide, but the left ones (on the photo at right) are folded. Abdomen short and stout, legs moderately long. Length of the body 15 mm. Tállya: Dor

gó (H8/a) Insecta: Coleoptera: Staphylinidae - Ventral and dorsal imprint of the same specimen (Figs 4-5), collected by GY. ENCSY and the authors in spring of 2000 (HNHM). Length of the head and the