Wyniki wyszukiwania - BazTech

1

Review of the Ordovician stratigraphy and fauna of the Anarak Region in Central Iran

Popov L. E., Hairapetian V., Evans D. H., Ghobadi Pour M., Holmer L. E., Baars C.

Acta Geologica Polonica

|

2015

|

Vol. 65, no. 4

403--435

EN

The Ordovician sedimentary succession of the Pol-e Khavand area, situated on the northern margin of the Yazd block, has important differences from those in other parts of Central Iran. It has been established that the presumably terminal Cambrian to Lower Ordovician volcano-sedimentary Polekhavand Formation, exposed in the Pol-e Khavand area, has non-conformable contact with greenschists of the Doshakh Metamorphic Complex. The succeeding, mainly siliciclastic Chahgonbad Formation contains low to moderately diverse faunal assemblages, including brachiopods, cephalopods, trilobites and tentaculitids. The Darriwilian age of the lower part of the formation is well established by the co-occurrence of brachiopod genera Camerella, Phragmorthis, Tritoechia and Yangtzeella. The associated rich cephalopod fauna is different from the Darriwilian cephalopod associations of the Alborz terrane and may show some affinity with warm water faunas of North China and South Korea. It is likely that the Mid Ordovician fauna recovered from the lower part of the Chahgonbad Formation settled in the area sometime during a warming episode in the late Darriwilian. By contrast the low diversity mid Katian brachiopod association includes only three taxa, which occur together with the trilobite Vietnamia cf. teichmulleri and abundant, but poorly preserved tentaculitids questionably assigned to the genus Costatulites. This faunal association bears clear signatures linking it to the contemporaneous cold water faunas of the Arabian, Mediterranean and North African segments of Gondwana. Four brachiopod species recovered from the Chahgonbad Formation, including Hibernodonta lakhensis, Hindella prima, Lomatorthis? multilamellosa and Yangtzeella chupananica are new to science.

2

Zjawisko "zachowania w ukryciu" skamieniałości — przegląd i przykłady z górnego dewonu Polski

Rakociński M.

Przegląd Geologiczny

|

2009

|

Vol. 57, nr 7

584-584

EN

"Sheltered preservation" of various organisms within shells of cephalopods is a well-known phenomenon and numerous examples have been frequently reported by paleontologists from several regions but so far not from Poland. In the present paper, spectacular examples of such occurrences of different organisms preserved mainly within empty cephalopod shells are reviewed. Moreover, specimens of trilobites representing the genus Cyrtosymbole, found within the phragmocone of a clymeniid ammonoid Kalloclymenia, and disarticulated fragments of trilobites preserved in body chamber of an orthoconic nautiloid are illustrated and shortly described from the Upper Famennian of Kowala (Holy Cross Mountains, Poland).

3

Linking southern Poland and northern Germany: Campanian cephalopods, inoceramid bivalves and echinoids

Jagt J.

Acta Geologica Polonica

|

2004

|

Vol. 54, no. 4

573-586

EN

The Campanian strata in the Wolbrom-Miechów area at Wierzchowisko, Jeżówka and Rzeżuśnia (i.e., the southwestern part of the Miechów Trough, southern Poland) have been studied in some detail. Collections of macrofossils available to date include generally well-preserved and diverse cephalopods (ammonoids, coleoids), inoceramid bivalves and irregular echinoids of considerable stratigraphic and correlative value. For the present paper, taxa which allow a preliminary correlation with northern Germany (Lagerdorf, Lehrte West Syncline and Munsterland Basin) are singled out for brief discussion. Stratigraphically useful taxa include the ammonites Pachydiscus (P.) haldemsis (SCHLUTER), Lewyites elegans (MOBERG), Scaphites (S.) hippocrepis III sensu COBBAN, S. (S.) gibbus SCHLUTER and Trachyscaphites spiniger spiniger (SCHLUTER), the coleoids Belemnitella ex gr. mucronata (VON SCHLOTHEIM) and Gonioteuthis quadrata (DE BLAINVILLE),the inoceramids Cataceramus dariensis (DOBROV & PAVLOVA), "Inoceramus" azerbaydjanensis ALIEV and "I." agdjakendsis ALIEV, and the echinoids Offaster pilula (LAMARCK), Galeola papillosa (LESKE), Echinocorys ex gr. subglobosa/turrita, E. ex gr. conica, Micraster (Gibbaster) ex gr. fastigatus/stolleyi and M. (M.) ex gr. schroederi/glyphus. The ammonite fauna, which is dominated by pachydiscids and diplomoceratids, is closely comparable to that from the Busko Zdrój area (i.e., the southeastern part of the Miechów Trough), but hoplitoplacenticeratids are still unknown from the Wolbrom-Miechów area which, taken together with inoceramid data, may point to a gap in the upper Lower Campanian (equivalent of conica/mucronata Zone).