scholarly journals First record of Epicymatoceras vaelsense (Nautilida) from the Maastrichtian white chalk of northern Denmark

2018 ◽  
Vol 66 ◽  
pp. 229-235 ◽  
Author(s):  
Oksana Malchyk ◽  
Marcin Machalski
Keyword(s):  
The Netherlands ◽  
Late Cretaceous ◽  
First Record ◽  
The Other ◽  
Northern Germany ◽  
Lower Upper ◽  
Lower Maastrichtian ◽  
C 30 ◽  
Upper Maastrichtian

The atypical Late Cretaceous nautilid Epicymatoceras vaelsense (Binkhorst van den Binkhorst, 1862) is described and illustrated on the basis of three specimens from the Maastrichtian white chalk of Denmark. One of these is probably from the lower/upper Maastrichtian boundary interval at Frejlev, while the other two originate from the uppermost Maastrichtian chalk as exposed in the Dania quarry; both localities are in Jylland, northern Denmark. These are first reports of E. vaelsense from Denmark; the species has previously been recorded from the uppermost Campanian and lower Maastrichtian of the Netherlands, Belgium, northern Germany and Poland. The presence of E. vaelsense in the topmost Maastrichtian white chalk in the Dania quarry is considered the youngest record of Epicymatoceras known to date, suggesting the persistence of the genus until the end of the Cretaceous. The diameter of the embryonic conch of the Danish E. vaelsense may be estimated at c. 30 mm, based on an individual from the Dania quarry, confirming earlier observations that the species possessed one of the largest embryonic conchs amongst Late Cretaceous nautilids.

scholarly journals Nannofossils, foraminifera and microforaminiferal linings in the Cenozoic diamictites of Cape Lamb, Vega Island, Antarctica

2014 ◽  
Vol 35 (1) ◽  
pp. 1-26 ◽  
Author(s):  
Andrea Concheyro ◽  
Andrea Caramés ◽  
Cecilia R. Amenábar ◽  
Marina Lescano
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
First Record ◽  
Organic Layer ◽  
Sediment Sources ◽  
Lower Maastrichtian ◽  
James Ross Island ◽  
The Antarctic ◽  
Upper Maastrichtian ◽  
Upper Campanian

AbstractMicropaleontological and palynological samples from three Cenozoic diamictites at Cape Lamb, Vega Island, James Ross Basin were analysed. Fossiliferous samples yielded reworked and autochthonous assemblages of Mesozoic calcareous nanno− fossils, impoverished Cretaceous foraminifera together with Neogene species, as well as Late Cretaceous dinoflagellate cysts, pollen, spores and abundant Cenozoic micro− foraminiferal linings. The recovered nannoflora indicates Early Cretaceous (Hauteri− vian-Albian) and Late Cretaceous (Santonian-Early Campanian) ages, suggesting an in− tensive reworking of marine sediments. The presence of the Early Cretaceous species Nannoconus circularis Deres et Acheriteguy in the diamictite represents its first record for the James Ross Basin. The scarce foraminiferal fauna includes Pullenia jarvisi Cushman, which indicates reworking from lower Maastrichtian-lower Paleocene sediments, and also the Neogene autochthonous Trochammina sp. aff. T. intermedia. The in− ner−organic layer observed inside this specimen appears to be identical to microfora− miniferal linings recovered from the same sample. Palynomorphs found in the studied samples suggest erosion from the underlying Snow Hill Island and the Lopez de Bertodano Formation beds (upper Campanian-upper Maastrichtian). These recovered assemblages indicate either different periods of deposition or reworking from diverse sources during Cenozoic glaciation, originating in James Ross Island and the Antarctic Peninsula with the influence of local sediment sources.

scholarly journals The echinoid genus Echinogalerus in the Maastrichtian type area

2003 ◽  
Vol 82 (3) ◽  
pp. 247-260
Author(s):  
R. Van der Ham ◽  
M. Van Birgelen
Keyword(s):  
Late Cretaceous ◽  
Ordinal Position ◽  
Northern Germany ◽  
Type Area ◽  
Lower Maastrichtian ◽  
Western Germany

AbstractThe Late Cretaceous echinoid genus Echinogalerus König, 1825 is remarkably diverse in the Maastrichtian type area (SE Netherlands and adjacent parts of NE Belgium and western Germany). So far, five species have been recognised, namely E. belgicus (Lambert, 1898), E. minutus (Smiser, 1935), E. muelleri (Schlüter, 1902), E. pusillus Lambert, 1911 and E. vetschauensis (Schlüter, 1902), which occur from the base of the Lower Maastrichtian (E. belgicus, E. pusillus, E. muelleri) up to the K/T boundary (E. minutus). Echinogalerus muelleri, which has the longest stratigraphical range, is the most diverse, while E. pusillus is the smallest echinoid in the area, reaching maximum lengths of 4.5 mm. Comparisons with other species of Echinogalerus described in the literature have now led to the recognition of three tentative infrageneric alliances. It is argued that the ordinal position of Echinogalerus (Holectypoida or Cassiduloida) cannot be evaluated as long as many species are still insufficiently known and two genera, from the Maastrichtian of northern Germany and Denmark, intermediate between the two orders, remain undescribed.

scholarly journals First record of Calappoidea and Dromioidea from the Upper Cretaceous (Upper Maastrichtian) of NW Madagascar

2003 ◽  
Vol 72 (2-3) ◽  
pp. 135-136
Author(s):  
Alessandro Garassino ◽  
Giovanni Pasini
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
First Record ◽  
Upper Maastrichtian

The crustaceans from the marine Berivotra Formation, dated as late Cretaceous, from 50 km south of Mahajanga, Madagascar contains macrurans, brachyurans and thalassinideans. Two brachyuran families, Raninidae and Dynomenidae, were previously identified with the genera Notopocorystes, Caloxanthus, Titanocarcinus, Xanthosia, and Dromiopsis. Fragmentary material now also allows the recognition of Dromioidea, Calappoidea and Xanthoidea.

scholarly journals First record of Pachydiscus noetlingi Kennedy, 1999 (Ammonoidea) from the Maastrichtian type area (the Netherlands)

2003 ◽  
Vol 82 (3) ◽  
pp. 303-307 ◽  
Author(s):  
J.W.M. Jagt ◽  
W.J. Kennedy
Keyword(s):  
The Netherlands ◽  
New Record ◽  
First Record ◽  
Type Area ◽  
Upper Maastrichtian

AbstractTwo specimens of a pachydiscid ammonite, a fragmentary silicified phragmocone from the Kunrade Limestone facies at Kunrade (Schunck), and a partial external mould preserved in flint from the Nekum Member (both Maastricht Formation, Belemnitella junior Zone of authors) at the former Blom quarry (Berg en Terblijt), are identified as Pachydiscus (P.) noetlingi Kennedy, 1999, a species previously known only from the Upper Maastrichtian of Baluchistan (Pakistan). This new record underscores the proposal of incursions of Tethyan biota into the type area of the Maastrichtian Stage, previously documented for other groups, including echinoderms and bivalves, as well.

scholarly journals Episkeletozoans and bioerosional ichnotaxa on isolated bones of Late Cretaceous mosasaurs and cheloniid turtles from the Maastricht area, the Netherlands

Geologos ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 39-49 ◽  
Author(s):  
John W.M. Jagt ◽  
Mart J.M. Deckers ◽  
Magda De Leebeeck ◽  
Stephen K. Donovan ◽  
Eric Nieuwenhuis
Keyword(s):  
The Netherlands ◽  
Late Cretaceous ◽  
Junior Synonym ◽  
Marine Reptiles ◽  
Upper Maastrichtian

AbstractIsolated bones of three taxa of marine reptiles (Mosasaurus hoffmannii Mantell, Plioplatecarpus marshi Dollo and Allopleuron hofmanni (Gray)) from various levels within the Maastricht Formation (upper Maastrichtian) at the former ENCI-HeidelbergCement Group quarry (Maastricht, the Netherlands) exhibit bioerosional traces and encrustation. Episkeletozoans include dimyid, ostreid and monopleurid bivalves, at least three species of cheilostome and cyclostome bryozoans and two adnate calcareous foraminifera. The bones show biting traces (Gnathichnus pentax Bromley, Linichnus cf. serratus Jacobsen & Bromley and Machichnus isp.), as well as borings. The latter may be referred to Karethraichnus lakkos Zonneveld, Bartels, Gunnell & McHugh, which is here considered to be a junior synonym of Gastrochaenolites isp.

A new species of late Cretaceous crab (Brachyura: Carcineretidae) from Albion Island, Belize

1997 ◽  
Vol 71 (4) ◽  
pp. 615-620 ◽  
Author(s):  
Francisco J. Vega ◽  
Rodney M. Feldmann ◽  
Adriana C. Ocampo ◽  
Kevin O. Pope
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Upper Cretaceous ◽  
The Other ◽  
Congeneric Species ◽  
Lower Maastrichtian ◽  
Chicxulub Impact ◽  
A New Species ◽  
Stratigraphic Range ◽  
Barton Creek

A new species of carcineretid crab, Carcineretesplanetarius, is described from the Upper Cretaceous (lower Maastrichtian) Barton Creek Dolomite at Albion Island, Belize. The age is based on the stratigraphic range of associated nerineid gastropods and correlation with nannoplankton, benthic foraminifera, and the other known congeneric species of crab found in Jamaica. Confirmation of this age aids in constraining the timing of ejecta deposits of the Chicxulub impact found at the top of Barton Creek Dolomite exposed on Albion Island. Paleoenvironmental and paleoecological analyses suggest that these crabs were swimmers in lagoonal settings, capable of burrowing a few centimeters into the mud for protection.

scholarly journals Inoceramid bivalve and dinoflagellate cyst integrated biostratigraphy of the topmost Campanian–Maastrichtian in a part of the Western Fore-Balkan Mountains, northwest Bulgaria

2020 ◽  
Vol 49 (3) ◽  
pp. 39-63
Author(s):  
Polina Pavlishina ◽  
Docho Dochev ◽  
Lubomir Metodiev ◽  
Eliza Vladimirova
Keyword(s):  
Depositional Environment ◽  
Dinoflagellate Cyst ◽  
Lower Upper ◽  
Stratigraphic Subdivision ◽  
First Occurrence ◽  
Lower Maastrichtian ◽  
Marine Productivity ◽  
G Ratio ◽  
Balkan Mountains ◽  
Upper Maastrichtian

We present the inoceramid and dinoflagellate cyst record from the topmost Campanian–Maastrichtian strata of three key sections of the Western Fore-Balkan Mountains, northwest Bulgaria. The following inoceramid zones were recognized: “Inoceramus” redbirdensis Zone, Endocostea typica Zone, Trochoceramus radiosus Zone and “Inoceramus” ianjonaensis Zone. The Campanian/Maastrichtian boundary was tentatively drawn slightly below the first occurrence of Endocostea typica. The uppermost inoceramid assemblage was confined to the lower part of the upper Maastrichtian. Dinoflagellate cyst ranges, as well as the first and the last occurrence events of dinocysts, provided valuable markers for the stratigraphic subdivision of the Maastrichtian. The first occurrence of Microdinium carpentierae was documented in proximity to the Campanian/Maastrichtian boundary. The Cerodinium diebelii Zone was recognized with a stratigraphical range from the lower Maastrichtian to the lower upper Maastrichtian. The last occurrence of Alterbidinium acutulum was recorded in the lower Maastrichtian and used as aid for tracing the lower/upper Maastrichtian substage boundary. The marked domination of delicate chorate dinocysts in all sections and the encountered low P/G ratio values are indicative of stable low-energy depositional environment and oligotrophic conditions, with normal marine productivity and nutrient availability in the basin during the Maastrichtian.

scholarly journals Gradualistic evolution in Belemnitella from the middle Campanian of Lower Saxony, NW Germany

2000 ◽  
Vol 47 ◽  
pp. 135-163
Author(s):  
Walter Kegel Christensen
Keyword(s):  
Morphological Changes ◽  
First Record ◽  
Morphological Characters ◽  
Northern Germany ◽  
Lower Saxony ◽  
Lower Upper ◽  
Northwest Germany ◽  
Lower Campanian ◽  
Upper Campanian

Nine samples of the Belemnitella lineage, including the uppermost Lower and lower Upper Campanian B. mucronata and the uppermost lower Upper Campanian B. misburgensis sp. nov., from the expanded uppermost Lower and lower Upper Campanian succession of the Lehrte West Synclinee east of Hannover, Lower Saxony, northern Germany have been subjected to univariate and bivariate statistical analyses. The succession consists of monotonous marly limestones and calcareous marls, which were deposited during 4–5 m.y. in a fairly stable environment. Based on superficial resemblance alone the nine samples are nearly identical, but trends have been recognized in the morphological characters when treated quantitatively. Three characters, the length from the apex to the protoconch, the slenderness of the guard and the alveolar angle, show evolutionary reversals (socalled zig-zag evolution) with net decreases or increases. The Schatzky distance shows stasis in B. mucronata and decreases in B. misburgensis sp. nov. The fissure angle displays unidirectional evolution and increases gradually. These morphological changes are interpreted as long term phyletic gradualism, although this model of evolution has almost universally been depicted as one of unidirectional change. B. misburgensis sp. nov. is closely allied to B. mucronata (its ancestor), but differs in its slightly smaller and more slender guard, in addition to its smaller Schatzky distance and larger fissure angle. B. praecursor is recorded from the uppermost five metres of the Lower Campanian, and this is the first record of this species from the highest Lower Campanian of northern Germany. The uppermost Lower and Lower Upper Campanian belemnite assemblages of the Misburg/Höver area in northern Germany are reviewed. The Upper Campanian Belemnitella successions of Norfolk in England, the Maastricht-Liège district in The Netherlands and Belgium, the Mons Basin in southern Belgium, Scania in southern Sweden and the Misburg-Höver area in northwest Germany are compared and contrasted.

scholarly journals First complete pterosaur from the Afro-Arabian continent: insight into pterodactyloid diversity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexander W. A. Kellner ◽  
Michael W. Caldwell ◽  
Borja Holgado ◽  
Fabio M. Dalla Vecchia ◽  
Roy Nohra ◽  
...  
Keyword(s):  
Middle Ages ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Taxonomic Diversity ◽  
First Record ◽  
The Other ◽  
Geological Record ◽  
Insight Into ◽  
The Middle Ages

AbstractDespite being known from every continent, the geological record of pterosaurs, the first group of vertebrates to develop powered flight, is very uneven, with only a few deposits accounting for the vast majority of specimens and almost half of the taxonomic diversity. Among the regions that stand out for the greatest gaps of knowledge regarding these flying reptiles, is the Afro-Arabian continent, which has yielded only a small number of very fragmentary and incomplete materials. Here we fill part of that gap and report on the most complete pterosaur recovered from this continent, more specifically from the Late Cretaceous (~95 mya) Hjoûla Lagerstätte of Lebanon. This deposit is known since the Middle Ages for the exquisitely preserved fishes and invertebrates, but not for tetrapods, which are exceedingly rare. Mimodactylus libanensis gen. et sp. nov. differs from the other Afro-Arabian pterosaur species named to date and is closely related to the Chinese species Haopterus gracilis, forming a new clade of derived toothed pterosaurs. Mimodactylidae clade nov. groups species that are related to Istiodactylidae, jointly designated as Istiodactyliformes (clade nov.). Istiodactyliforms were previously documented only in Early Cretaceous sites from Europe and Asia, with Mimodactylus libanensis the first record in Gondwana.

Sign in / Sign up

Export Citation Format

Share Document