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THE 33RD NORDIC GEOLOGICAL WINTER MEETING 10-12. JANUARY 2018 KGS. LYNGBY, DENMARK HOSTED BY GEOLOGICAL SOCIETY OF DENMARK & TECHNICAL UNIVERSITY OF DENMARK Dansk Geologisk Forening Geological Society of Denmark POSTER POSTER Carinodens – a new addition to the Biostratigraphy and palaeoecology of Late Cretaceous mosasaur fauna of calcareous nannofossils in the Lower Denmark Cretaceous Munk Marl Bed, Danish North Sea Jesper Milàn1, John W.M. Jagt2, Johan Lindgren3 and Anne S. Schulp2 Sarah D. Møller1, Emma Sheldon2 and Jan Audun 1Geomuseum Faxe, Denmark, 2Natuurhistorisch Rasmussen3 Museum Maastricht, The Netherlands, 3Department of 1Department of Geosciences and Natural Resource Geology, Lund University, Sweden Management, Københavns Universitet, 2GEUS, Geological Survey of Denmark and Greenland, 3Fossil- og Molermuseet, Museum Mors The small durophagous mosasaurine mosasaur (Reptilia, Mosasauridae) genus Carinodens is exceedingly rare in north European chalk The Lower Cretaceous Munk Marl Bed of the deposits, with published finds limited to a small Tuxen Formation (Danish Central Graben) marks number of shed tooth crowns and two partial a change in the depositional environment within dentaries from The Netherlands and Belgium, all a chalk unit. Here we investigate the calcareous assigned to Carinodens belgicus. A newly nannofossils from this interval of the Danish discovered isolated, shed tooth crown from the Boje-2C well with emphasis on biostratigraphy UNESCO world heritage site of Stevns Klint and palaeoecology to better understand the expands the known geographical distribution of pelagic environment at the time of deposition. A another species, C. minalmamar, first described total of seventy-two samples were analysed from from Morocco, to Denmark. The specimen was the well. The samples correlate to the upper found within the uppermost metres of the Lower Barremian nannofossil zones BC14 and Maastrichtian chalk deposits, thereby placing it LK20B. An acme of nannoconid ‘tops’ is proposed within the last 50.000 years of the Cretaceous. as a new biostratigraphical event characterising The new tooth crown represents the the middle part of the Munk Marl Bed. High northernmost occurrence of the genus abundances of thermophile taxa suggest warm Carinodens. Previous finds of mosasaur dental surface water conditions at the time of and skeletal materials from Denmark have all deposition. Indicators of increased fertility show been assigned to the hypercarnivorous particularly low abundances indicating a mosasaurids Mosasaurus hoffmannii and decrease in surface water fertility, presumably Plioplatecarpus sp. Thus, the new specimen related to an increased detrital input. provides important new information on Correspondence analysis ordinates samples in ecological niche partitioning amongst large relation to identified palaeoecological proxies marine reptiles during the latest Maastrichtian. and reflects palaeotrophic levels in the surface water within the section. The analysis shows that the calcareous nannofossils indicate a period of more oligotrophic surface water in the middle of the section. 147 .

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Two Rare Mosasaurs from the Maastrichtian of Angola and the Netherlands
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NAÎUUlîHISTORISCH MAANDBLAD SEPTEMBER 2004 JAARGANG fi 261 EEN NIEUWE MINIMOSASAURUS UIT MAASTRICHT Anne S. Schulp, Natuurhistorisch Museum Maastricht, De Bosquetplein 6-7, 621 I Kj Maasthcht Het is één van de minst bekende mosasauriërs ter wereld, en de zaam is vergeleken met de zoveel beter beken• de Mosasaurus hoffmanni blijft nog de vraag. allerkleinste bovendien. Een nieuwe vondst van deze Cannodens belgicus uit de ENCI-groeve werpt meer licht op het mysterieuze BUITEN MAASTRICHT gebit van de minimosasaurus. Ook over de eetgewoonten van Carinodens valt nu wat meer te zeggen. Buiten Maastricht is Carinodens opvallend genoeg maar nauwelijks bekend, terwijl de karakterisde- ke tanden toch geen ruimte voor verwarring overlaten. In Bulgarije is totdusver welgeteld één EERSTE VONDST SINDS 1913 naturelles de Belgique te Brussel schonk. tandje opgegraven (TZANKOV, 1939), maar Ra• Soms is de geschiedenis van de nomenclatuur men Tzankov (géén familie!), diezich momenteel Vondsten van Carinodens, de kleinste mosasau• van een fossiel nogal onoverzichtelijk. Bij Cari• met de studie van de Bulgaarse mosasauriërs be• rus uit het Maastrichtse Krijt, behoren tot de nodens is dat zeker het geval. Omdat de tanden zighoudt, wist ons te vertellen dat er op de Bul• grote zeldzaamheden. Losse tanden duiken nog toch wat meer afgeplat waren dan die van Glo• gaarse Car/nodens-vindplaats nog niet veel gegra• wel eens op, maar meer compleet materiaal is bidens veranderde de naam in Compressidens, ven is. Dat biedt dus hoop voor de toekomst Carinodens nagenoeg onbekend. Verzamelaar Frans Fon- maar die naam bleek al voor een ander dier in Ook uit Marokko is bekend.
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