Upper Cretaceous Source Rocks of Northern and Northwestern South America: ABSTRACT

Leptomaria antipodensis and Leptomaria hickmanae are described from the Upper Cretaceous [Maastrichtian] Lopez de Bertodano Formation, Seymour Island, and represent the first Mesozoic records of the family Pleurotomariidae from Antarctica. Leptomaria stillwelli, L. seymourensis, Conotomaria sobralensis and C. bayeri, from the Paleocene [Danian], Sobral Formation, Seymour Island, are described as new. Leptomaria larseniana (Wilckens, 1911) new combination, also from the Sobral Formation, is redescribed based on better-preserved material. The limited diversity of the pleurotomariid fauna of Seymour Island is more similar to that of the Late Cretaceous faunas of Australia and New Zealand in terms of the number of genera and species, than to the older, more diverse faunas of South America, southern India, or northwestern Madagascar, supporting the status of the Weddelian Province as a distinct biogeographic unit. The increase in the species richness of this fauna during the Danian may be due to the final fragmentation of Gondwana during this period.

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ORGANIC GEOCHEMISTRY OF CRUDE OILS AND UPPER CRETACEOUS SOURCE ROCKS FROM CONCESSION 11, WEST SIRTE BASIN, LIBYA

Journal of Petroleum Geology ◽

10.1111/jpg.12659 ◽

2016 ◽

Vol 39 (4) ◽

pp. 393-413 ◽

Cited By ~ 5

Author(s):

W. Sh. El Diasty ◽

S. Y. El Beialy ◽

K. E. Peters ◽

H. El Atfy ◽

A. M. Gheith ◽

...

Keyword(s):

Upper Cretaceous ◽

Organic Geochemistry ◽

Source Rocks ◽

Crude Oils ◽

Sirte Basin

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Lower Tertiary and Upper Cretaceous Source Rocks in Louisiana and Mississippi: Implications to Gulf of Mexico Crude Oil (1)

AAPG Bulletin ◽

10.1306/0c9b23b7-1710-11d7-8645000102c1865d ◽

1990 ◽

Vol 74 ◽

Cited By ~ 1

Author(s):

ROGER SASSEN (2)

Keyword(s):

Gulf Of Mexico ◽

Crude Oil ◽

Upper Cretaceous ◽

Source Rocks ◽

Lower Tertiary

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Geological control in the distribution of source rocks and reservoirs in upper cretaceous carbonates of southeast Turkey

Journal of Petroleum Science and Engineering ◽

10.1016/0920-4105(87)90002-7 ◽

1987 ◽

Vol 1 (2) ◽

pp. 105-114 ◽

Cited By ~ 6

Author(s):

Cor Wagner ◽

Mehmet Pehlivan

Keyword(s):

Upper Cretaceous ◽

Source Rocks ◽

Geological Control

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Late Cretaceous – Tertiary sediments offshore central West Greenland: lithostratigraphy, sedimentary evolution, and petroleum potential

Canadian Journal of Earth Sciences ◽

10.1139/e85-105 ◽

1985 ◽

Vol 22 (7) ◽

pp. 1001-1019 ◽

Cited By ~ 54

Author(s):

Flemming Rolle

Keyword(s):

Upper Cretaceous ◽

Source Rocks ◽

Petroleum Potential ◽

Shallow Marine ◽

West Greenland ◽

Reservoir Rocks ◽

Sedimentary Sequences ◽

Sedimentary Evolution ◽

Petroleum Generation ◽

Exploratory Wells

Five dry exploratory wells were drilled through Upper Cretaceous and Tertiary sediments on the West Greenland shelf in 1976 and 1977. Two of these entered Precambrian basement, two bottomed in Paleocene or Upper Cretaceous basalt, and one in Campanian mudstone. On the basis of samples and logs supplied to the Geological Survey of Greenland the sedimentary sequence has been divided into seven new formations: the Campanian Narssarmiut Formation, consisting of coarse basement wash and black mudstone; the Campanian to Eocene Ikermiut Formation, consisting of marine organic-rich mudstone; the Upper Paleocene to Eocene Hellefisk Formation, comprising shallow-marine to paralic sandstone and mudstone; the Eocene Nukik Formation, consisting of turbiditic sandstone and mudstone; the Eocene to Oligocene Kangâmiut Formation of shelf to shallow-marine clean and argillaceous sandstone; the Oligocene to Neogene Manîtsoq Formation, consisting of coarse paralic to fan delta sandstone; and the Neogene Ataneq Formation, consisting of protected shallow-marine mudstone.The sedimentary evolution of the area fits well with earlier proposed models for the tectonic evolution of the Baffin Bay–Labrador Sea region.Potential petroleum source rocks are present in the Upper Cretaceous to Paleocene mudstone, and, even though they are largely immature in the drilled sections, they are expected to have entered the petroleum generation zone in the deeper parts of the basin. Their potential is mainly for gas, but some oil potential is also present. No reservoir rocks were encountered in the deeper parts of the sedimentary sequences, and the porous sandstones that occur higher in the sequence lack seals.

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Biomarker signatures of Upper Cretaceous hydrocarbon source rocks from the Latrobe Group, Gippsland Basin

ASEG Extended Abstracts ◽

10.1071/aseg2018abp002 ◽

2018 ◽

Vol 2018 (1) ◽

pp. 1-4

Author(s):

Lian Jiang ◽

Simon C. George

Keyword(s):

Upper Cretaceous ◽

Source Rocks ◽

Hydrocarbon Source Rocks ◽

Gippsland Basin

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Exquisite air sac histological traces in a hyperpneumatized nanoid sauropod dinosaur from South America

Scientific Reports ◽

10.1038/s41598-021-03689-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Tito Aureliano ◽

Aline M. Ghilardi ◽

Bruno A. Navarro ◽

Marcelo A. Fernandes ◽

Fresia Ricardi-Branco ◽

...

Keyword(s):

Computed Tomography ◽

South America ◽

Ct Scan ◽

Upper Cretaceous ◽

Postcranial Skeleton ◽

Air Sacs ◽

Neural Canal ◽

Scan Data ◽

Pneumatic Structures ◽

First Time

AbstractThis study reports the occurrence of pneumosteum (osteohistological structure related to an avian-like air sac system) in a nanoid (5.7-m-long) saltasaurid titanosaur from Upper Cretaceous Brazil. We corroborate the hypothesis of the presence of an air sac system in titanosaurians based upon vertebral features identified through external observation and computed tomography. This is the fifth non-avian dinosaur taxon in which histological traces of air sacs have been found. We provided a detailed description of pneumatic structures from external osteology and CT scan data as a parameter for comparison with other taxa. The camellate pattern found in the vertebral centrum (ce) of this taxon and other titanosaurs shows distinct architectures. This might indicate whether cervical or lung diverticula pneumatized different elements. A cotylar internal plate of bone tissue sustains radial camellae (rad) in a condition similar to Alamosaurus and Saltasaurus. Moreover, circumferential chambers (cc) near the cotyle might be an example of convergence between diplodocoids and titanosaurs. Finally, we also register for the first time pneumatic foramina (fo) and fossae connecting camellate structures inside the neural canal in Titanosauria and the second published case in non-avian dinosaurs. The extreme pneumaticity observed in this nanoid titanosaur contrasts with previous assumptions that this feature correlates with the evolution of gigantic sizes in sauropodomorphs. This study reinforces that even small-bodied sauropod clades could present a hyperpneumatized postcranial skeleton, a character inherited from their large-bodied ancestors.

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