Non-marine Bivalvia of the mid-Cretaceous Kem Kem Group of southeastern Morocco

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of African Earth Sciences Pub Date : 2025-08-14 DOI:10.1016/j.jafrearsci.2025.105813

Kiera E. Franklin , Martin C. Munt , David M. Martill , Samir Zouhri , Roy E. Smith

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Abstract

Invertebrate fossils are rare in the famously vertebrate-rich mid-Cretaceous Kem Kem Group of southeastern Morocco. This study presents the first detailed account of freshwater bivalves from this important stratigraphic unit. The fossils described originate from the Ifezouane Formation, the lower sandy unit of the group. The superfamily Trigonioidoidea is represented by Monginella cf. flattersensis, the new genus Goumardonaia introduced for ?Monginella radieri and the new genus and species Kemkemnaia parvum (Desertellidae). Specimens referred to the Unionidae include the new species Unio radleyi, which with Kemkemnaia parvum are potentially endemics. This study reveals a previously unrecognised freshwater bivalve diversity in the mid-Cretaceous deposits of North Africa. Most of the bivalve specimens are fragmentary, reflecting the dynamic fluvial environment of the Kem Kem Group, and are preserved as ferruginous sandstone internal moulds.

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摩洛哥东南部中白垩纪Kem Kem群的非海生双壳类

无脊椎动物化石在摩洛哥东南部著名的脊椎动物丰富的中白垩纪Kem Kem群中是罕见的。这项研究首次详细介绍了来自这一重要地层单元的淡水双壳类动物。所描述的化石来自Ifezouane组，该组的下部砂质单元。trigonioido总科以Monginella cff . flattersensis为代表。蒙古蒙古菌与荒漠蒙古菌科蒙古蒙古菌新属新种。被提到的银联科标本包括新物种银联，它与小叶银联是潜在的地方性物种。这项研究揭示了北非白垩纪中期沉积物中以前未被认识到的淡水双壳类生物多样性。双壳类标本多呈碎片状，反映了Kem Kem群的动态河流环境，并以铁砂岩内模的形式保存下来。

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来源期刊

Journal of African Earth Sciences 地学-地球科学综合

CiteScore

4.70

自引率

4.30%

发文量

240

审稿时长

12 months

期刊介绍： The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.