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Roveacrinidae (Crinoidea, Articulata) from the Cenomanian and Turonian of North Africa (Agadir Basin and Anti-Atlas, Morocco, and central Tunisia): biostratigraphy and taxonomy

Gale Andrew Scott

Acta Geologica Polonica

2020

Vol. 70, no. 3

273--310

Successions exposed in the Agadir Basin (upper Albian to middle Turonian), in the Anti-Atlas (lower Turonian) in Morocco and in central Tunisia (Cenomanian–Turonian) yield abundant microcrinoids of the family Roveacrinidae, which are described and assigned to 32 species and formae, in ten genera. The following new taxa are described: Fenestracrinus gen. nov. with the type species F. oculifer sp. nov., Discocrinus africanus sp. nov., Styracocrinus rimafera sp. nov., Lebenharticrinus quinvigintensis sp. nov., L. zitti sp. nov., Euglyphocrinus cristagalli sp. nov., E. jacobsae sp. nov., E. truncatus sp. nov., E. worthensis sp. nov., Roveacrinus gladius sp. nov., R. solisoccasum sp. nov. and Drepanocrinus wardorum sp. nov. In addition, the new subfamily Plotocrininae is erected. The stratigraphical distribution of the taxa in two important localities, Taghazout in the Agadir Basin (Morocco) and Sif el Tella, Djebel Mhrila (central Tunisia), is provided. The faunas from the uppermost Albian and lowermost Cenomanian of the Agadir Basin are nearly identical to those recorded from central Texas, USA, some 5,300 km away, and permit a detailed correlation (microcrinoid biozones CeR1 and CeR2) to be established across the southern part of the Western Tethys, independently supported by new ammonite records. For the middle and upper Cenomanian, rather few detailed records of microcrinoids are available elsewhere, and the North African record forms the basis for a new zonation (CeR3–CeR6). The distribution of Turonian Roveacrinidae in North Africa is evidently very similar to that described in the Anglo-Paris Basin, and zones TuR1–3, TuR9, 10 and 14 are recognised for the first time in the Tethys.

Kaminskiinae n.subfam. and Kaminskia n.gen., a new Early Cretaceous calcareous agglutinated Foraminifera from Southern Dobrogea, Romania

Neagu T. A.

Annales Societatis Geologorum Poloniae

1999

Vol. 69, No. 3-4

173-188

This study presents the earliest known calcareous-cemented agglutinated Foraminifera with a typical textulariacean wall structure occurring in the Lower Cretaceous (uppermost Berriasian to lower Hauterivian) of southern Dobrogea. Based on the external morphology of the test and the canaliculate structure of its chamber wall, the author erects the new genus Kaminskia, within the new subfamily Kaminskiinae. The following species are newly described: Kaminskia flabellata, K. cuneata, K. acuta, K. filiformae, K. exigua, and K. dissimile.

W artykule opisano najstarsze ze znanych taksonów otwornic aglutynujących o wapiennych ścianach z rodziny Textulariacea, występujące w osadach dolnej kredy (najwyższy berias-dolny hoteryw) w południowej Dobrudży w Rumunii. W oparciu o cechy zewnętrzne skorupek oraz obecność prostych (nierozwidlających się) kanalików wewnątrz ścian komór, autor opisał nowy rodzaj Kaminskia, zaliczając go do nowej podrodziny Kaminskiinae. W obrębie nowego rodzaju opisano nowe gatunki: Kaminskia flabellata, K. cuneata, K. acuta, K. filiformae, K. exigua i K. dissimile.