scholarly journals A palynological investigation of some Lower Kimmeridgian deposits from Spain

1988 ◽  
Vol 7 (2) ◽  
pp. 217-232 ◽  
Author(s):  
A. W. Van Erve ◽  
R. E. Besems ◽  
C. F. Love
Keyword(s):  
Major Part ◽  
Late Jurassic ◽  
Dinoflagellate Cysts ◽  
Palynological Data ◽  
Betic Cordilleras ◽  
Palynological Assemblages ◽  
Iberian Chain ◽  
The Impact ◽  
Lower Kimmeridgian

Abstract. The present paper provides the first palynological data from two ammonite controlled sections from the Lower Kimmeridgian (Sutneria platynota Ammonite Zone) in Spain. The Segura de la Sierra sequence is located in the Betic Cordilleras and the Hontanar sequence is located in the Iberian Chain. The palynological assemblages, dominated by dinoflagellate cysts and sporomorphs, include taxa which are well known from other areas to be long-ranging throughout the major part of the Mesozoic. Most noteworthy is the presence of Cicatricosisporites spp. in the material investigated. The impact of this on the assumption that a strong diachronous south-north migration of this taxon existed during Middle and Late Jurassic times is discussed.

scholarly journals The palynology of the Kimmeridge Clay and Carstone formations (Upper Jurassic – Lower Cretaceous) at Middlegate Quarry, North Lincolnshire, UK, and its biostratigraphical and palaeoenvironmental significance

2021 ◽  
pp. pygs2021-005
Author(s):  
Roderick D. Black ◽  
Paul Dodsworth
Keyword(s):  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Average Concentration ◽  
Dinoflagellate Cysts ◽  
Content Type ◽  
Palynological Data ◽  
Supplementary Material ◽  
Clay Formation ◽  
First Time ◽  
Lower Kimmeridgian

At Middlegate Quarry, the Carstone Formation is an approximately 0.8 m thick unit of oolitic ferruginous sandstone. It rests unconformably on the lower Kimmeridge Clay Formation (KCF) and is overlain by the Hunstanton Formation (Red Chalk) with an apparently gradational junction. Marine dinoflagellate cysts (dinocysts) are present at a concentration of 9,520 to 13,600 specimens per gramme in the 0.15 m of KCF below the unconformity, and include taxa that confirm ammonite evidence for the intra-Lower Kimmeridgian Substage (Upper Jurassic, Cymodoce Ammonite Zone). A rich recovery of well-preserved Lower Cretaceous palynomorphs is reported for the first time from the overlying Carstone. Reworking of mudstone from the KCF into the formation appears to have provided a local argillaceous preservation matrix at Middlegate. The basal 0.15 m is dominated by palynomorphs derived from the KCF but the interval from 0.15 m to 0.55 m above the unconformity mainly contains indigenous Lower Cretaceous palynomorphs. Dinoflagellate cysts are present in the Carstone at an average concentration of 454 specimens per gramme, and include taxa that probably have stratigraphical range bases above the Aptian – Albian stage boundary; Cyclonephelium compactum, Cyclonephelium intonsum, Endoscrinium heikeae, Leptodinium cancellatum (consistent), Stephodinium coronatum and Stephodinium spinulosum. The additional presence of taxa with range tops / event tops in the Lower Albian Tardefurcata Ammonite Zone (common Cauca parva, frequent Canninginopsis monile and Kleithriasphaeridium eoinodes, and rare Dingodinium albertii, Discorsia nannus and Kiokansium prolatum) indicate probable assignment to this zone. The new palynological data support previous macrofossil (brachiopod) study of the Carstone at Middlegate and nearby Melton Bottom Quarry which tentatively assigns its highest part to the Tardefurcata Zone. The palynological and palynofacies assemblages are interpreted to confirm a relatively proximal to shoreline site of deposition, possibly inner to middle neritic.Supplementary material: One pdf file, with quarry photographs and a palynological distribution chart, is available at https://doi.org/10.6084/m9.figshare.c.5538977

Environmental impact of nutrients from nordic fish farming

1995 ◽  
Vol 31 (10) ◽  
pp. 61-71 ◽  
Author(s):  
M. Enell
Keyword(s):  
Major Part ◽  
Fish Farming ◽  
Fish Farms ◽  
Feed Composition ◽  
The North ◽  
Comprehensive Development ◽  
The Baltic ◽  
Inland Water Bodies ◽  
The Impact ◽  
Feed Coefficient

During the last 20 years there has been an interesting development of the Nordic fish farming, with regard to the feeding and farming technology and to the increase in production quantities. During the period 1974-1994 the production increased from 15,800 to about 250,000 tonnes/year. In 1974 the major part of the production was in Denmark, and in 1994 the major part was in Norway. The nutrient impact of fish farming on surrounding sea areas is mainly a function of the feed coefficient, the feed composition and metabolic processes in the fish. The comprehensive development of the feed composition and the feeding technology has resulted in reduced load of unmetabolized nutrients from fish farms, calculated per tonne fish produced. In 1974 the mean Nordic feed coefficient was 2.08 and in 1994 the coefficient was 1.25. Feed coefficients of 1.0-1.1 are now reported for Danish and Norwegian freshwater and marine fish farms. The nitrogen (N) and phosphorus (P) content of the feed has decreased, in addition the quality of the nutrient substances in the feed has changed, especially for N. The N content has decreased from 7.8 to 6.8% during the period 1974-1994 and the content of P has decreased from 1.7 to 0.7% during the same period. This development of the feed coefficient and the feed composition has resulted in a present load from a typical Nordic fish farm of 55 kg N and 4.8 kg P/t fish produced. The figures for 1974 were 132 kg N and 31 kg P/t fish produced. The Nordic fish farming production in 1994 resulted in a load of about 13,750 t N and about 1,200 t P on the actual recipients. The load from the Swedish, Finnish and Danish fish farming operations, with the Baltic Sea and the Skagerrak as the recipients, is negligible in comparison with other pollution sources. The quantities of N and P from the fish farming are equal to 0.5% of the atmospheric deposition on the sea surface and 3% of the atmospheric P load. Norwegian, Icelandic and the Faroe Islands fish farming operations are using the North Sea and the Norwegian Sea as the recipients. However, the nutrient load from single fish farms in certain coastal and inland water bodies can be significant and must be considered in the impact assessment together with other sources.

Citizens' Readiness for E-government in Developing Countries (CREG)

2010 ◽  
pp. 215-233 ◽  
Author(s):  
Hany Abdelghaffar
Keyword(s):  
Developing Countries ◽  
Empirical Research ◽  
Major Part ◽  
Relevant Literature ◽  
Electronic Government ◽  
Government Services ◽  
Government Project ◽  
Research Findings ◽  
Ict Infrastructure ◽  
The Impact

Many developing countries are facing difficulties in applying successful electronic government (e-government) projects. A major part of these difficulties that they are not used by citizens due to the lack of appropriate ICT infrastructure that support e-government services; in addition to the existence of a small percentage of citizens who are able to deal with such technology. This chapter introduces an empirical research that closely investigates the e-government weaknesses in developing countries from two major perspectives: e-readiness and trust. The research proposes a model based on e-readiness assessments and relevant literature that investigates the impact of citizens’ readiness for e-government (CREG) on e-government success within developing countries. The model was tested on the Egyptian e-government project as a sample of developing countries. The research findings confirmed the importance of the CREG model to achieve successful e-government projects in developing countries.

First records of Somalinautilus (Cephalopoda: Nautiloidea) from the Jurassic of Southern Germany – inferences for trans-provincial migrations

2020 ◽  
Vol 298 (2) ◽  
pp. 137-146
Author(s):  
Günter Schweigert
Keyword(s):  
Sea Level ◽  
Geographic Distribution ◽  
Middle Jurassic ◽  
Late Jurassic ◽  
Southern Germany ◽  
First Time ◽  
Lower Kimmeridgian ◽  
Lower Bathonian

The Late Jurassic nautiloid Somalinautilus antiquus (Dacqué, 1910), previously only known by the holotype from Lower Kimmeridgian strata of Ethiopia, is reported from the Lower Kimmeridgian (Platynota Zone) of Southern Germany. This unexpected record largely expands the known geographic distribution of this species. Another species of Somalinautilus, S. clavifer Tintant , 1994, is recorded for the first time from the Middle Jurassic (Lower Bathonian, Zigzag Zone) of Southern Germany. A short stratigraphic and palaeogeographic review of Somalinautilus occurrences is provided. Faunal migrations of nautiloids over large distances were probably triggered by sea- level highstands and/or palaeocurrents.

Dinoflagellate cysts from an allochthonous block of Nordenskjöld Formation (Upper Jurassic), north-west James Ross Island

1992 ◽  
Vol 4 (3) ◽  
pp. 267-278 ◽  
Author(s):  
Michael G. Snape
Keyword(s):  
New Species ◽  
Papua New Guinea ◽  
Antarctic Peninsula ◽  
Late Jurassic ◽  
New Genus ◽  
Upper Jurassic ◽  
Dinoflagellate Cysts ◽  
Dinoflagellate Cyst ◽  
North West ◽  
James Ross Island

An allochthonous block of the Nordenskjöld Formation from north-west James Ross Island, Antarctic Peninsula has yielded a diverse marine palynoflora. Dinoflagellate cyst assemblages from the 185 m thick sequence are described and compared with similar microfloras previously described from Australia, Papua New Guinea and Madagascar. A mid Tithonian (Late Jurassic) age is suggested for the section. One new genus, Helbydinium gen. nov. and four new species, Helbydinium scabratum sp. nov., Leptodinium acneum sp. nov., Leptodinium posterosulcatum sp. nov. and Rhynchodiniopsis foveata sp. nov. are described.

scholarly journals Revision of the Late Jurassic teleosaurid genus Machimosaurus (Crocodylomorpha, Thalattosuchia)

2014 ◽  
Vol 1 (2) ◽  
pp. 140222 ◽  
Author(s):  
Mark T. Young ◽  
Stéphane Hua ◽  
Lorna Steel ◽  
Davide Foffa ◽  
Stephen L. Brusatte ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Total Body Length ◽  
Coastal Marine ◽  
Geological Age ◽  
Northeastern France ◽  
Total Body ◽  
Upper Kimmeridgian ◽  
A New Species ◽  
Lines Of Evidence ◽  
Lower Kimmeridgian

Machimosaurus was a large-bodied genus of teleosaurid crocodylomorph, considered to have been durophagous/chelonivorous, and which frequented coastal marine/estuarine ecosystems during the Late Jurassic. Here, we revise the genus based on previously described specimens and revise the species within this genus. We conclude that there were three European Machimosaurus species and another taxon in Ethiopia. This conclusion is based on numerous lines of evidence: craniomandibular, dental and postcranial morphologies; differences in estimated total body length; geological age; geographical distribution; and hypothetical lifestyle. We re-diagnose the type species Machimosaurus hugii and limit referred specimens to only those from Upper Kimmeridgian–Lower Tithonian of Switzerland, Portugal and Spain. We also re-diagnose Machimosaurus mosae , demonstrate that it is an available name and restrict the species to the uppermost Kimmeridgian–lowermost Tithonian of northeastern France. We re-diagnose and validate the species Machimosaurus nowackianus from Harrar, Ethiopia. Finally, we establish a new species, Machimosaurus buffetauti , for the Lower Kimmeridgian specimens of France and Germany (and possibly England and Poland). We hypothesize that Machimosaurus may have been analogous to the Pliocene–Holocene genus Crocodylus in having one large-bodied taxon suited to traversing marine barriers and additional, geographically limited taxa across its range.

scholarly journals The impact of different pollution sources on modern dinoflagellate cysts in Sishili Bay, Yellow Sea, China

2012 ◽  
Vol 84-85 ◽  
pp. 1-13 ◽  
Author(s):  
Dongyan Liu ◽  
Yajun Shi ◽  
Baoping Di ◽  
Qianli Sun ◽  
Yujue Wang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Pollution Sources ◽  
Dinoflagellate Cysts ◽  
The Impact

scholarly journals Revisiting nuclear policies under Modi regime: Leadership analysis and repercussions for Pakistan

2021 ◽  
Vol 34 (3) ◽  
pp. 248
Author(s):  
Muhammad Umer Hayat ◽  
Aleena Zaid
Keyword(s):  
Major Part ◽  
Political Power ◽  
Descriptive Study ◽  
The Political ◽  
Leadership Analysis ◽  
Alternative Perspective ◽  
The Social ◽  
Bharatiya Janata Party ◽  
The Impact ◽  
Political Realm

Modi’s leadership and governance pattern is a matter of consideration as concerned directly with styles of functioning of his adopted policies, which reflects his undertakings both in the social and political realm. This paper seeks to offer an alternative perspective in the domain of the rising threat of Hinduism, while the consolidation of the political power in India has been raising serious implications for Pakistan, in particular. It highlights the impact of all such harsh realist nuclear policies that may cause more complexities and further deteriorate the region's stability. This study deployed descriptive, analytical, and explanatory research techniques but to great extent, a major part consists of the descriptive study, which will be used when it comes to genesis and existing various scenarios. Findings also substantiate India’s intentions and the propaganda waged and all steps keenly targeting Pakistan. Bharatiya Janata Party (BJP) seems to be adopting new realist approaches deeply rooted with that of Kautilya’s. Therefore, the paper concludes that the rise of Hindu nationalists gets the support of Rashtriya Swayamsevak Sangh (RSS)-based concept demanding soft measures to lessen the worrisome environment causing by the Modi regime.

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