scholarly journals Bird remains from the Maastrichtian type area (Late Cretaceous)

2008 ◽  
Vol 87 (4) ◽  
pp. 353-358 ◽  
Author(s):  
G.J. Dyke ◽  
A.S. Schulp ◽  
J.W.M. Jagt
Keyword(s):  
Late Cretaceous ◽  
Type Area ◽  
Cretaceous Period

AbstractRemains of Late Cretaceous birds are rare, which is especially true for Europe and the type area of the Maastrichtian Stage (southeast Netherlands, northeast Belgium) in particular. In the present paper, we record new remains (isolated tarsometatarsus and radius) that document the presence of both enantiornithine and ornithurine birds in the Maastrichtian area. These fossils, although fragmentary, are important in view of their stratigraphic age: all bird remains discovered to date in the Maastricht area are amongst the youngest ’non-modern’ avians known, originating from strata deposited less than 500,000 years prior to the end of the Cretaceous Period.

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.

The pterosaurian remains from the Grünbach Formation (Campanian, Gosau Group) of Austria: a reappraisal of ‘Ornithocheirus buenzeli’

2010 ◽  
Vol 148 (2) ◽  
pp. 334-339 ◽  
Author(s):  
ERIC BUFFETAUT ◽  
ATTILA ŐSI ◽  
EDINA PRONDVAI
Keyword(s):  
Late Cretaceous ◽  
Proximal Part ◽  
Great Accuracy ◽  
Distinctive Features ◽  
Lower Jaw ◽  
Nomen Dubium ◽  
Late Cretaceous Period ◽  
The Family ◽  
Gosau Group ◽  
Cretaceous Period

AbstractThe fragmentary pterosaur material from the Campanian Grünbach Formation (Gosau Group) of Muthmannsdorf (Austria), previously identified as Ornithocheirus buenzeli Bunzel, 1871, is revised. A lower jaw fragment shows a helical type of articulation, which is known in several families of pterosaurs, and cannot be identified with great accuracy. The proximal part of a humerus shows distinctive features that allow it to be referred to as a member of the family Azhdarchidae, which is widespread in the Late Cretaceous Period of Europe. Ornithocheirus buenzeli is considered a nomen dubium. The pterosaur material from the Grünbach Formation cannot be used as evidence for the presence of ornithocheirids in the Late Cretaceous of Europe.

A note on Salenia gr. nutrix Peron and Gauthier, 1881 (Echinoidea) from the Maastrichtian type area (southeastern Netherlands, northeastern Belgium)

1999 ◽  
Vol 73 (4) ◽  
pp. 663-666 ◽  
Author(s):  
John W. M. Jagt ◽  
Raymond W. J. M. Van Der Ham ◽  
Roland Meuris ◽  
Ludo Indeherberge
Keyword(s):  
Late Cretaceous ◽  
North Africa ◽  
Single Specimen ◽  
Type Area ◽  
The Mediterranean

A single specimen of a saleniid echinoid recently collected from the Late Maastrichtian of the type area of the Maastrichtian Stage is notable in being closely related to Salenia nutrix Peron and Gauthier, 1881. Representatives of the “nutrix group” have previously been recorded from the Late Cretaceous of the Mediterranean and north Africa. The occurrence in the type Maastrichtian of a representative of this group thus furnishes additional evidence of Tethyan incursions in the area during the Late Maastrichtian.

Taxodiaceous conifers from the Maastrichtian type area (Late Cretaceous, NE Belgium, SE Netherlands)

2001 ◽  
Vol 116 (3-4) ◽  
pp. 233-250 ◽  
Author(s):  
R.W.J.M. van der Ham ◽  
J.H.A. van Konijnenburg-van Cittert ◽  
J. van der Burgh
Keyword(s):  
Late Cretaceous ◽  
Type Area

scholarly journals The Kilen Expedition 1985

1993 ◽  
Vol 40 ◽  
pp. 9-32
Author(s):  
E. Håkansson ◽  
C. Heinberg ◽  
C. Hjort ◽  
P. Mølgaard ◽  
S. A. S. Pedersen
Keyword(s):  
Late Cretaceous ◽  
Late Jurassic ◽  
Higher Plants ◽  
Mobile Belt ◽  
Pull Apart Basin ◽  
Late Cretaceous Period ◽  
History Of ◽  
Entire Sequence ◽  
Cretaceous Period ◽  
Inland Ice

The 1985 expedition constitutes the first comprehensive investigation of the isolated, hyperarctic semi­nunatak Kilen in eastern North Greenland. Well over 3 km of generally marine, elastic sediments are preserved from the Late Jurassic to Late Cretaceous period. While half this amount accumulated in ·a comparatively stable tectonic regime prevailing during Late Jurassic and Early Cretaceous time, the Late Cretaceous (Turonian-Coniacian) sediments are characterized by their deposition in a local pull-apart basin developed in the regional Wandel Hav Strike-Slip Mobile Belt. Subsequent, localized compression along this belt has deformed the entire sequence rather severely in a complex series of en echelon domal folding and thrusting, most likely during the later part of the Cretaceous. Quaternary marine sediments of probable interglacial origin (> 100.000 years old) have been found to contain a mollusc fauna requiring temperatures above the present level. Flade lsblink, the largest local icecap in Greenland, is composed of several semi-independant ice domes, and there is evidence that the history of this icecap deviates significantly from that of the Inland Ice. A total of 34 species of higher plants, 29 species of birds, and 11 species of mammals have been recorded from Kilen; vegetation studies indicate a July mean temperature of around 2.5°C.

scholarly journals On the taphonomy of the late Maastrichtian (Late Cretaceous) marine turtle Allopleuron hofmanni

2011 ◽  
Vol 90 (2-3) ◽  
pp. 187-196 ◽  
Author(s):  
R. Janssen ◽  
R.R. van Baal ◽  
A.S. Schulp
Keyword(s):  
Late Cretaceous ◽  
Population Characteristics ◽  
Marine Turtle ◽  
Pectoral Girdle ◽  
Marine Turtles ◽  
Seagrass Meadows ◽  
Type Area

AbstractAn exhaustive screening of public collections containing remains of the latest Cretaceous (late Maastrichtian) marine turtle Allopleuron hofmanni (Gray, 1831) from the type area of the Maastrichtian Stage (southeast Netherlands, northeast Belgium) shows the available material to represent almost exclusively adult individuals. The various skeletal elements are not preserved in proportionally equal abundance, with portions of carapace, pectoral girdle, cranium and mandible overrepresented. These observations can be explained by population characteristics and taphonomic factors. During the late Maastrichtian, while hatchlings and juveniles in all likelihood lived and fed elsewhere, extensive seagrass meadows might have supported a population of only adult marine turtles.

Determination of formation paleo-pressure and evolution process using gaseous hydrocarbon inclusions

2020 ◽  
Author(s):  
Cunjian Zhang ◽  
Jingdong Liu ◽  
Youlu Jiang
Keyword(s):  
Late Cretaceous ◽  
Middle Jurassic ◽  
Formation Mechanisms ◽  
Formation Pressure ◽  
Gas Reservoirs ◽  
Gaseous Hydrocarbon ◽  
Late Cretaceous Period ◽  
Cretaceous Period ◽  
Early Late ◽  
Vapor Liquid

<p>Research on overpressure evolution and its formation mechanisms is of great significance for revealing reservoir formation mechanisms and predicting formation pressures in oil and gas reservoirs before drilling. However, research methods addressing overpressure evolution are not without issues. The fluid inclusion PVT simulation and basin simulation can be used to investigate the paleo-pressure.</p> <p>The homogenization temperatures of inclusions were tested. The accuracy of the microscopic laser Raman spectroscopy analysis is too limited to fully test the components of gaseous hydrocarbon inclusions so that the organic components of the natural gas in the present-day gas reservoirs represented the gaseous hydrocarbon inclusions. In addition, the vapor-liquid ratio of gaseous hydrocarbon inclusions cannot be measured by CLSM. Firstly, A series of images at different slice depths was obtained by adjusting the focal length of a high-resolution microscope. Secondly, CorelDRAW software was used to calculate the areas of inclusions and bubbles; fitting functions were established between the inclusion areas and slice depths, and between the bubble areas and slice depths. Finally, the inclusion and bubble volumes were integrated to obtain the vapor-liquid ratios of the inclusions. PVTsim software can calculate the trapping pressures of inclusions. Combined with basin simulation, the evolution of paleo-pressure can be determined.</p> <p>The above methods were used to investigate the paleo-pressure of the Upper Triassic Xujiahe Formation in the northeast portion of the Sichuan Basin. Overpressure began to develop in the Middle Jurassic period. Due to hydrocarbon generation taking place, the formation pressure increased rapidly from the Middle Jurassic period to the early Late Cretaceous period. Since the early Late Cretaceous period, the formation pressure has gradually decreased due to tectonic uplift and erosion. From the Oligocene period to the present, the formation pressure have increased again in local areas due to tectonic compression.</p>

scholarly journals A bioclast-based astronomical timescale for the Maastrichtian in the type area (southeast Netherlands, northeast Belgium) and stratigraphic implications: the legacy of P.J. Felder

2018 ◽  
Vol 97 (4) ◽  
pp. 229-260 ◽  
Author(s):  
Norbert Keutgen
Keyword(s):  
Present Approach ◽  
Calcareous Nannofossils ◽  
Dinoflagellate Cysts ◽  
Type Area ◽  
Cretaceous Period ◽  
Reference Section

AbstractThe present paper, dedicated to the legacy of local geologist–engineer Peter Jozef (Sjeuf) Felder, who died in 2009, confirms his view that bioclasts constitute a valuable tool in the correlation of outcrops and borehole cores across the type area of the Maastrichtian Stage in the vicinity of Maastricht. His approach of interpreting changes in bioclast contents as having been influenced by Milankovitch cyclicity has here been applied successfully to the entire sedimentary complex of Maastrichtian (latest Cretaceous) age in the study area. In the present approach, results are corroborated by index fossils, mainly dinoflagellate cysts but also calcareous nannofossils, which allow correlation with the Stevns-1 core reference section in eastern Denmark. With the exception of local remnants ofBelemnella obtusaZone age, the Maastrichtian Stage in its type area encompasses the last 4.6 Ma of the Cretaceous Period (i.e. theBelemnella sumensis/Acanthoscaphites tridensZone up to the K/Pg boundary). P.J. Felder's bioclast analyses have enabled the detection of twelve 400 kyr eccentricity cycles of Milankovitch cyclicity in the area. However, the section is not continuous; there is a hiatus ofc.700 kyr between the Gulpen and Maastricht formations at the ENCI-HeidelbergCement Group quarry. In addition, smaller hiatuses, usually in the range of several 20 kyr cycles, have been detected in the upper Maastricht Formation.

Late Cretaceous palaeoenvironments and biotas: an Antarctic perspective

1992 ◽  
Vol 4 (4) ◽  
pp. 371-382 ◽  
Author(s):  
J. A. Crame
Keyword(s):  
Late Cretaceous ◽  
High Latitude ◽  
Evolutionary Significance ◽  
Source Regions ◽  
Palynological Assemblages ◽  
James Ross Island ◽  
Extinction Events ◽  
The Antarctic ◽  
Cretaceous Period ◽  
Mass Extinction Events

The Cretaceous period is often regarded as one of "greenhouse" warmth, with perhaps its acme occurring in the late Albian stage (100 Ma ago). However, it is now apparent that, even at this time, there were significant meridional temperature gradients and distinct temperate biotas in the highest latitude regions. This is particularly so in the Southern Hemisphere, where an extensive Albian fossil record from Antarctica, Australia and New Zealand has revealed the presence of austral floras and faunas. With the recent improvements in stratigraphical correlations, it has become possible to trace the later Cretaceous palaeoenvironmental record in the Antarctic Peninsula region. Unfortunately, resolution of the early Late Cretaceous (Cenomanian–Coniacian stages) is still imprecise; there are some indications of strongly differentiated palynological assemblages, but studies of both macrofaunas and palaeotemperature estimates are incomplete. By the Santonian–Campanian, high-latitude biotas are well developed in the James Ross Island region and their enhancement through the final stages of the Cretaceous can be linked to a phase of global cooling. The persistence of low diversity temperate communities in high latitude regions may be of considerable ecological and evolutionary significance. For example, there is evidence to suggest that these communities may have been more resistant to mass extinction events; they may also have been important source regions for replacement taxa that arose after such events.

Sign in / Sign up

Export Citation Format

Share Document