HYDROCARBON POTENTIAL OF THE MESOZOIC AND BASAL TERTIARY OF THE GIPPSLAND BASIN: A STRATIGRAPHIC ANALYSIS

1972 ◽  
Vol 12 (1) ◽  
pp. 138 ◽  
Author(s):  
T. R. Haskell
Keyword(s):  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
Economic Potential ◽  
The West ◽  
Stratigraphic Analysis ◽  
Structural Framework ◽  
Marine Influence ◽  
Gippsland Basin ◽  
North And South ◽  
Early Upper

A thick sequence of uppermost Jurassic, Cretaceous and basal Tertiary non-marine sedimentary rocks underlies the Gippsland area of Victoria. The older part of this sequence is extensively exposed in the west of the Gippsland area, but elsewhere it is known dominantly from well intersections. Although several hiates are recognised, palynological data indicate that a comparatively complete Cretaceous section can be compiled from this sequence in the Gippsland area.The uppermost Jurassic to Paleocene rocks can be divided into three units. The oldest unit is uppermost Jurassic and Lower Cretaceous in age. It consists of variably compacted greywackes and lithic sandstones, minor arkoses and interbedded siltstones and mudstones. The overlying early Upper Cretaceous and Paleocene units are distinguishable paleontologically and consist of quartzose sandstones, carbonaceous siltstones and mudstones.There is no indication of marine influence on sedimentation present in the microfossil content of any of the palynotogical preparations from samples taken throughout most of the sequence. Several species of microplankton are common in the oldest unit, but they are indicative of the lacustrine conditions under which the unit was deposited.Minor hydrocarbon shows have been recorded from the oldest unit, but the sandstones are characteristically tight. More significant shows have been reported from the two younger units that contain relatively clean sandstones interbedded with siltstones and mudstones. These units possess the greatest economic potential of all of the pre-Eocene rocks of the Gippsland Basin.The structural framework of the region is composed of separate series of north-easterly and easterly trending faults or monoclines and a south-easterly regional dip. Differential movements of blocks defined by this fault-monocline pattern appears to have resulted in erosion of the more prospective early Upper Cretaceous and Paleocene strata from all but two subrectangular areas respectively immediately north and south of Seaspray.

The Edgerton landslides

1995 ◽  
Vol 32 (6) ◽  
pp. 989-1001 ◽  
Author(s):  
D.M. Cruden ◽  
S. Thomson ◽  
H.J. Kim ◽  
A.E. Peterson
Keyword(s):  
Key Words ◽  
Residual Strength ◽  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
Back Analysis ◽  
Rock Slide ◽  
The West ◽  
West Wall ◽  
Earth Flow ◽  
Average Precipitation

Observations over 20 years of three contiguous translational slides on the west wall of a 100 m deep valley in the Interior Plains document their evolution into advancing, composite, slow earth-flow earth-slides involving over a million cubic metres of displaced material. Colluvial deposits downslope of the apparent toes of the flows are moving. The reactivation of the abandoned slides in the Upper Cretaceous sedimentary rocks was likely triggered by years of higher than average precipitation following clearing of brush behind the crest of the slope. Back analysis is consistent with fully softened rock in the crowns of the slides and displaced materials at residual strength. Key words : landslide, rock-slide, earth-flow, earth-slide, Interior Plains.

Gerald H. Thayer's ornithological work in St Vincent and the Grenadines, Lesser Antilles

2018 ◽  
Vol 45 (1) ◽  
pp. 21-39 ◽  
Author(s):  
James W. Wiley
Keyword(s):  
New York ◽  
New York City ◽  
West Indies ◽  
The United States ◽  
Lesser Antilles ◽  
American Museum ◽  
The West ◽  
Comparative Zoology ◽  
North And South America ◽  
North And South

Gerald Handerson Thayer (1883–1939) was an artist, writer and naturalist who worked in North and South America, Europe and the West Indies. In the Lesser Antilles, Thayer made substantial contributions to the knowledge and conservation of birds in St Vincent and the Grenadines. Thayer observed and collected birds throughout much of St Vincent and on many of the Grenadines from January 1924 through to December 1925. Although he produced a preliminary manuscript containing interesting distributional notes and which is an early record of the region's ornithology, Thayer never published the results of his work in the islands. Some 413 bird and bird egg specimens have survived from his work in St Vincent and the Grenadines and are now housed in the American Museum of Natural History (New York City) and the Museum of Comparative Zoology (Cambridge, Massachusetts). Four hundred and fifty eight specimens of birds and eggs collected by Gerald and his father, Abbott, from other countries are held in museums in the United States.

Lithostratigraphy of the Palaeoproterozoic Hekpoort Formation (Pretoria Group, Transvaal Supergroup), South Africa

2020 ◽  
Vol 123 (4) ◽  
pp. 655-668
Author(s):  
N. Lenhardt ◽  
W. Altermann ◽  
F. Humbert ◽  
M. de Kock
Keyword(s):  
South Africa ◽  
Bushveld Complex ◽  
Sedimentary Rocks ◽  
Type Locality ◽  
Large Igneous Province ◽  
Braided River ◽  
River Systems ◽  
The West ◽  
Igneous Province ◽  
Transvaal Supergroup

Abstract The Palaeoproterozoic Hekpoort Formation of the Pretoria Group is a lava-dominated unit that has a basin-wide extent throughout the Transvaal sub-basin of South Africa. Additional correlative units may be present in the Kanye sub-basin of Botswana. The key characteristic of the formation is its general geochemical uniformity. Volcaniclastic and other sedimentary rocks are relatively rare throughout the succession but may be dominant in some locations. Hekpoort Formation outcrops are sporadic throughout the basin and mostly occur in the form of gentle hills and valleys, mainly encircling Archaean domes and the Palaeoproterozoic Bushveld Complex (BC). The unit is exposed in the western Pretoria Group basin, sitting unconformably either on the Timeball Hill Formation or Boshoek Formation, which is lenticular there, and on top of the Boshoek Formation in the east of the basin. The unit is unconformably overlain by the Dwaalheuwel Formation. The type-locality for the Hekpoort Formation is the Hekpoort farm (504 IQ Hekpoort), ca. 60 km to the west-southwest of Pretoria. However, no stratotype has ever been proposed. A lectostratotype, i.e., the Mooikloof area in Pretoria East, that can be enhanced by two reference stratotypes are proposed herein. The Hekpoort Formation was deposited in a cratonic subaerial setting, forming a large igneous province (LIP) in which short-termed localised ponds and small braided river systems existed. It therefore forms one of the major Palaeoproterozoic magmatic events on the Kaapvaal Craton.

KERCH STRAIT IN KAMYSH-BURUN SPIT AREA: HIGH-RESOLUTION SEISMOACOUSTIC APPROACH

2018 ◽  
Author(s):  
В. Зинько ◽  
V. Zin'ko ◽  
А. Зверев ◽  
A. Zverev ◽  
М. Федин ◽  
...  
Keyword(s):  
High Resolution ◽  
Fracture Zone ◽  
Sedimentary Cover ◽  
Sedimentary Rocks ◽  
The West ◽  
Early Generation ◽  
The Third ◽  
Azov Sea ◽  
Kerch Strait ◽  
Made In

The seismoacoustical investigations was made in the western part of the Kerch strait (Azov sea) near Kamysh-Burun spit. The fracture zone with dislocated sedimentary rocks layers and buried erosional surface was revealed to the west of spit. Three seismofacial units was revealed to the east of spit. The first unit was modern sedimentary cover. The second ones has cross-bedding features and was, probably, the part of early generation of Kamysh-Burun spit, which lied to the east of its modern position. The lower border of the second unit is the erosional surface supposed of phanagorian age. The third unit is screened by acoustic shedows in large part.

Apercu geologique sur les collines de Boutenac (Aude)

1962 ◽  
Vol S7-IV (3) ◽  
pp. 362-379
Author(s):  
Alain Combes
Keyword(s):  
Upper Cretaceous ◽  
Upper Triassic ◽  
Normal Faulting ◽  
The West ◽  
Southern France ◽  
Sandy Limestone

Abstract The Boutenac hills in the northeastern Corbieres region of southern France, are part of the autochthonous foreland of the eastern Corbieres nappe. They are an isolated massif between the Paleozoic formations of the Alaric mountain on the west, and the Jurassic and Cretaceous formations of the Fontfroide chain on the east, entirely surrounded by alluvium. Structurally, they comprise Mesozoic formations on the east thrust over the Eocene on the west, on a fault that is the prolongation of the Saint Chinian frontal fault to the northeast. The Mesozoic formations comprise upper (?) Triassic shale and dolomite, sandy limestone, dolomite, and limestone; Jurassic red sandstones and shales; and upper Cretaceous transgressive clastics. The Eocene is limestone and marl overlain by continental conglomerate and molasse, transgressive on the west upon the Alaric Paleozoics. Folding and thrust and normal faulting are important in the structure.

Late Mesozoic—Cenozoic clay mineral successions of southern Iran and their palaeoclimatic implications

Clay Minerals ◽  
2005 ◽  
Vol 40 (2) ◽  
pp. 191-203 ◽  
Author(s):  
F. Khormali ◽  
A. Abtahi ◽  
H. R. Owliaie
Keyword(s):  
Electron Microscopy ◽  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
X Ray Diffraction ◽  
Humid Climate ◽  
X Ray ◽  
Late Mesozoic ◽  
Southern Iran ◽  
Transmission Electron

AbstractClay minerals of calcareous sedimentary rocks of southern Iran, part of the old Tethys area, were investigated in order to determine their origin and distribution, and to reconstruct the palaeoclimate of the area. Chemical analysis, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and thin-section studies were performed on the 16 major sedimentary rocks of the Fars and Kuhgiluyeh Boyerahmad Provinces.Kaolinite, smectite, chlorite, illite, palygorskite and illite-smectite interstratified minerals were detected in the rocks studied. The results revealed that detrital input is possibly the main source of kaolinite, smectite, chlorite and illite, whilein situneoformation during the Tertiary shallow saline and alkaline environment could be the dominant cause of palygorskite occurrences in the sedimentary rocks.The presence of a large amount of kaolinite in the Lower Cretaceous sediments and the absence or rare occurrence of chlorite, smectite, palygorskite and illite are in accordance with the warm and humid climate of that period. Smaller amounts of kaolinite and the occurrence of smectite in Upper Cretaceous sediments indicate the gradual shift from warm and humid to more seasonal climate. The occurrence of palygorskite and smectite and the disappearance of kaolinite in the late Palaeocene sediments indicate the increase in aridity which has probably continued to the present time.

scholarly journals Mass contents of natural radioactive elements in the main types of rocks of the Mesozoic sediments of the West-Siberian Plate and their comparative assessment with the contents in the deposits of some sedimentary basins of the former USSR

2020 ◽  
Vol 177 ◽  
pp. 02004
Author(s):  
Viacheslav Turyshev
Keyword(s):  
Western Siberia ◽  
Sedimentary Rocks ◽  
Sedimentary Basins ◽  
Comparative Assessment ◽  
Radioactive Elements ◽  
The West ◽  
Sedimentary Deposits ◽  
Former Ussr

The average and boundary contents of natural radioactive elements in sandy, aleuritic, argillaceous, mixed and carbonaceous types of sedimentary rocks of the main groups of productive strata of the Jurassic-Cretaceous age of Western Siberia are estimated; a comparison of the obtained values of the contents of radioelements with their contents in sedimentary deposits of some regions of the former USSR is performed.

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