The Upper Carboniferous Clifton Formation of northern New Brunswick: coal-bearing deposits of a semi-arid alluvial plain: Discussion

1983 ◽  
Vol 20 (7) ◽  
pp. 1212-1215 ◽  
Author(s):  
H. W. van de Poll
Keyword(s):  
New Brunswick ◽  
Alluvial Plain ◽  
Upper Carboniferous ◽  
Semi Arid

The Upper Carboniferous Clifton Formation of northern New Brunswick: coal-bearing deposits of a semi-arid alluvial plain

1982 ◽  
Vol 19 (9) ◽  
pp. 1775-1785 ◽  
Author(s):  
Andrew S. Legun ◽  
Brian R. Rust
Keyword(s):  
New Brunswick ◽  
Central Africa ◽  
Plant Litter ◽  
Alluvial Plain ◽  
Common Source ◽  
Fine Grained ◽  
South Central ◽  
Okavango River ◽  
Sand Sheet ◽  
Semi Arid

Two contiguous successions within Member B of the Westphalian Clifton Formation are exposed on the coast of Chaleur Bay east of Bathurst, New Brunswick. The upper succession is dominated by sandstone, and the lower by shale, which encloses isolated channel and lenticular sandstone bodies. Distinctive features of the shale are thin coals, casts of tree trunks, calcareous paleosols, and deep desiccation cracks with calcareous coatings. Markov chain analysis of the shale-dominated succession defines a repetitive sequence of shale, rippled fine-grained sandstone, paleosol, and coal. This sequence is attributed to filling of flood basins followed by emergence and pedogenesis under semi-arid conditions, which prevented thick coal accumulation. The major sandstone bodies are interpreted as channels, associated with lenticular levee, crevasse-splay, or mouth-bar deposits of a semi-arid alluvial plain on which anastomosing channels dominated. The Okavango River of south-central Africa and Cooper's Creek in central Australia are proposed as modern analogues.The upper succession of Member B is characterized by sheet sandstones made up of top-truncated trough and planar cross-stratified units, with abundant plant litter and calcareous intraclasts. The rocks are interpreted as braided-fluvial sand sheet deposits that blanketed the lower succession floodplain. Petrographic and paleocurrent data suggest a common source for both successions. The progradation of the braided sand sheet may reflect a sedimentary response to climate change, tectonic rejuvenation, or a combination of both.

Status of Selected Minerals in Soil, Fodder and Dairy Animals in the Semi-arid Central Alluvial Plain of Punjab

2018 ◽  
Vol 18 (2) ◽  
pp. 273
Author(s):  
S.T. Singh ◽  
S.K. Uppal ◽  
C.S. Randhawa ◽  
S.S. Randhawa
Keyword(s):  
Alluvial Plain ◽  
Dairy Animals ◽  
Semi Arid

Soft-body preservation in the leaiid clam shrimp (Branchiopoda, Diplostraca) and its palaeoecological implications

Crustaceana ◽  
2014 ◽  
Vol 87 (11-12) ◽  
pp. 1338-1350 ◽  
Author(s):  
Yan-Bin Shen ◽  
Frederick R. Schram
Keyword(s):  
New Brunswick ◽  
Shell Gland ◽  
Soft Body ◽  
Digestive Tube ◽  
Upper Carboniferous ◽  
Clam Shrimp ◽  
Special Genus

Leaia is a special genus of extinct “conchostracan” branchiopods; its soft parts have not been known until now. The leaiid specimens with soft bodies reported in the present paper came from two localities: the Upper Carboniferous Canso Group of New Brunswick, Canada, and the Permian Mount Glossopteris Formation of the Ohio Range, Holick Mountains, Antarctica. They include head, biramous antennae, mandible, shell gland, male claspers, and digestive tube. These parts together fully demonstrate that the leaiid clam shrimp indeed should be attributed to the crustaceans, instead of Mollusca. Based on the ribbed valves and structure of soft parts it should be placed in the branchiopodan Diplostraca. We believe that this group, which went extinct at the end of the Permian, is quite different from those of Laevicaudata, Spinicaudata, and Cyclestheriida. Hence, it should have its own higher taxon, Leaiina. The well-developed and sharply pointed head, delicate and short biramous antennae, in concert with the radial ribs on the valves probably indicate a burrowing in-faunal habit.

Westphalian alluvial plain sedimentation, Isle of Arran, Scotland

1989 ◽  
Vol 126 (4) ◽  
pp. 407-421 ◽  
Author(s):  
M. Kirk
Keyword(s):  
Sedimentary Facies ◽  
Detailed Examination ◽  
Alluvial Plain ◽  
Upper Carboniferous ◽  
Overbank Sediments ◽  
Flood Plains ◽  
The North ◽  
Floodplain Deposits ◽  
Channel Deposits ◽  
Basin Margin

AbstractFacies analysis suggests that Westphalian (Upper Carboniferous) Coal Measure sequences on the Isle of Arran, Scotland, were deposited in a proximal alluvial plain environment close to the basin margin. Detailed examination of well exposed coastal sections has revealed the existence of six laterally and vertically interrelated sedimentary facies. Facies 1 to 3 are interpreted as fluvial channel deposits. Low sinuosity multistorey (facies 1), low sinuosity vertically accreted (facies 2), and rare high sinuosity laterally accreted channel deposits (facies 3) are developed. Associated overbank sediments comprise the deposits of crevasse splays (facies 4), flood plains (facies 5) and shallow lakes (facies 6). In terms of the spatial distribution of facies, a relatively high proportion of fluvial channel and floodplain deposits (facies 2 and 5) occur in the more proximal sequence at Laggan compared with the more distally located sequence occurring at Corrie. Palaeocurrent measurements from fluvial channel sandstones indicate that sediment source areas and the Westphalian basin margin lay to the north and northwest. Down palaeoslope towards the southeast, normal coal-bearing Westphalian sediments formed penecontemporaneously on the Scottish mainland in Ayrshire.A sedimentological model is presented for the proximal non-coal-bearing Westphalian sequences of Arran. This model can explain the differences observed between the Arran sediments, and contemporaneous normal coal-bearing Westphalian sediments of the Scottish mainland.

Pedogenic processes and soil–landform relationships for identification of yield-limiting soil properties

Soil Research ◽  
2017 ◽  
Vol 55 (3) ◽  
pp. 273 ◽  
Author(s):  
Duraisamy Vasu ◽  
Surendra Kumar Singh ◽  
Pramod Tiwary ◽  
Padikkal Chandran ◽  
Sanjay Kumar Ray ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Properties ◽  
Alluvial Plain ◽  
Saturated Hydraulic Conductivity ◽  
Soil Variability ◽  
Exchangeable Sodium ◽  
Two Factors ◽  
Deccan Plateau ◽  
Pedogenic Processes ◽  
Semi Arid

Knowledge of soil–landform relationships helps in understanding the dominant pedogenic processes causing variations in soil properties within and between landforms. In this study, we investigated how major pedogenic processes in three landform positions of the semi-arid Deccan Plateau (India) have led to current plant yield-limiting soil properties. For this, we characterised 26 pedons from three landforms – piedmont, alluvial plain and valley – and performed factor analysis on the dataset. As the frequency distribution of the dataset was highly skewed for most of the soil properties, landform-wise partition and log-transformation were performed before studying soil variability within landforms. Results indicated that two factors explained 56, 71 and 64% of variability in soil properties in piedmonts, alluvial plains and valleys, respectively. The major soils in lower piedmonts (Typic Haplustalfs and Typic Rhodustalfs) were spatially associated with Vertisols (Sodic Haplusterts) occurring in alluvial plains and valleys. The soil properties in alluvial plains and valleys (Vertic Haplustepts, Sodic Haplusterts and Typic Ustifluvents) were modified due to regressive pedogenic processes. These soils were characterised by high pH (8.5–9.8), exchangeable sodium percentage (16.5–46.6) and poor saturated hydraulic conductivity (<1cmh–1). Subsoil sodicity induced by the presence of pedogenic calcium carbonate impaired the hydraulic conductivity. Subsoil sodicity and poor saturated hydraulic conductivity were identified as major yield-limiting soil properties. The relationships found between specific soil properties, surface and subsurface horizons, and position in the landscape helped to determine the dominant pedogenic processes and how these influenced current soil properties and their effects on crop yield.

The Boulton Field, Block 44/21a, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 671-680 ◽  
Author(s):  
A. M. Conway ◽  
C. Valvatne
Keyword(s):  
North Sea ◽  
Gas Production ◽  
Alluvial Plain ◽  
Upper Carboniferous ◽  
Braided Stream ◽  
Fluvial Architecture

AbstractThe Boulton Field was discovered in 1984 when gas was tested from the Lower Ketch Unit, Carboniferous Westphalian C/D, in well 44/21-2. Following appraisal drilling in 1990, the Boulton 'B' structure was delineated and a trap confirmed by a combination of up-dip seal against basal Permian shales, and salts and lateral seal against sealing faults and impermeable Westphalian C sediments. A second structure was drilled in the same year, Boulton 'F', with gas discovered in the deeper Murdoch Sand Interval of the Westphalian C/D. The two separate structures collectively form the Boulton Field.Current deliverability from the 'B' structure, Lower Ketch Sands is approximately 100 MMSCFD from a single producer. Developed with a minimal platform facility, the gas is delivered to Theddlethorpe Gas Terminal via offshore compression at the nearby Murdoch Field. The reservoir in Boulton 'B' comprises a series of channel sands deposited in a braided stream complex flowing predominantly from north to south across an Upper Carboniferous alluvial plain. Sandbody connectivity within the complex fluvial architecture of the Westphalian C is a key control on gas production.

Sign in / Sign up

Export Citation Format

Share Document