scholarly journals Depositional and Diagenetic History of the Triassic Redbeds and Evaporites from the Mercia Mudstone Group in the Carnduff 02 Core of County Antrim, Northern Ireland

2016 ◽  
Author(s):  
Anna Sofia Andeskie
Keyword(s):  
Northern Ireland ◽  
History Of ◽  
County Antrim ◽  
Diagenetic History

Redistributing the Population: GIS Adds Value to Historical Demography

1996 ◽  
Vol 8 (2) ◽  
pp. 90-104 ◽  
Author(s):  
Janette Lee
Keyword(s):  
Northern Ireland ◽  
Settlement Pattern ◽  
Historical Demography ◽  
Water Bodies ◽  
Choropleth Mapping ◽  
County Antrim ◽  
Gis Software

A model for more accurately representing the distribution of population is currently under development using some of the functionality of the Arc/Info GIS software. Included are factors for settlement pattern, topography and the presence of water bodies. The model is tested on County Antrim in Northern Ireland and the value of traditional choropleth mapping assessed in comparison with the output from the model.

DIAGENETIC HISTORY OF CAMBRIAN SANDSTONE UNITS IN WESTERN WISCONSIN

2016 ◽  
Author(s):  
Rachel Fliflet ◽  
◽  
Justin M. Poirier ◽  
Brian J. Mahoney ◽  
Kent M. Syverson
Keyword(s):  
History Of ◽  
Diagenetic History

DIAGENETIC HISTORY OF CAMBRIAN SANDSTONE UNITS IN WESTERN WISCONSIN: IMPLICATIONS FOR RESOURCE EXTRACTION

2016 ◽  
Author(s):  
Rachel Fliflet ◽  
◽  
Justin M. Poirier ◽  
J. Brian Mahoney ◽  
Kent M. Syverson
Keyword(s):  
Resource Extraction ◽  
History Of ◽  
Diagenetic History

scholarly journals Experimental degradation of helicoidal photonic nanostructures in scarab beetles (Coleoptera: Scarabaeidae): implications for the identification of circularly polarizing cuticle in the fossil record

2018 ◽  
Vol 15 (148) ◽  
pp. 20180560 ◽  
Author(s):  
Giliane P. Odin ◽  
Maria E. McNamara ◽  
Hans Arwin ◽  
Kenneth Järrendahl
Keyword(s):  
Uric Acid ◽  
Fossil Record ◽  
Evolutionary History ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Alkaline Conditions ◽  
History Of ◽  
Diagenetic History ◽  
Scarab Beetles

Scarab beetles (Coleoptera: Scarabaeidae) can exhibit striking colours produced by pigments and/or nanostructures. The latter include helicoidal (Bouligand) structures that can generate circularly polarized light. These have a cryptic evolutionary history in part because fossil examples are unknown. This suggests either a real biological signal, i.e. that Bouligand structures did not evolve until recently, or a taphonomic signal, i.e. that conditions during the fossilization process were not conducive to their preservation. We address this issue by experimentally degrading circularly polarizing cuticle of modern scarab beetles to test the relative roles of decay, maturation and taxonomy in controlling preservation. The results reveal that Bouligand structures have the potential to survive fossilization, but preservation is controlled by taxonomy and the diagenetic history of specimens. Further, cuticle of specific genus ( Chrysina ) is particularly decay-prone in alkaline conditions; this may relate to the presence of certain compounds, e.g. uric acid, in the cuticle of these taxa.

scholarly journals Ultrastructure, dissolution and "pyritization" of Late Quaternary and Recent echinoderms

1987 ◽  
Vol 36 ◽  
pp. 275-287
Author(s):  
Margit Jensen ◽  
Elsebeth Thomsen
Keyword(s):  
Late Pleistocene ◽  
Sea Water ◽  
Late Quaternary ◽  
Pore Space ◽  
Water Interface ◽  
Sea Stars ◽  
Northern Norway ◽  
History Of ◽  
Organic Tissue ◽  
Diagenetic History

The diagenetic history of the skeletal elements of Late Pleistocene-Holocene Ophiura sarsi from the shelf off northern Norway (Andfjorden, Malangsdjupet) is elucidated by comparison with natural and induced degradation of the skeletal elements of Recent ophiuroids (brittle stars) and asteroids (sea stars) from Danish waters. Dissolution features ("core-and-rind") in the trabeculae of fossil and Recent echinoderm stereom are initiated during death and early decay of organic tissue in the animals. The trabeculae have a polycrystal­line lamellar ultrastructure and lose their older central part during later stages of dissolution, which are dependant on undersaturation of the sea-water with regard to CaC03• The presence of undersaturated sea-water is supported by palaeoecological studies (Thomsen & Vorren 1984, 1986) implying oxygen deficient periods in the Late Pleistocene and an increased biogenic production in the Holocene. Pyrite framboids are situated in the secondary voids within the trabeculae and in the pore space of the stereom of the Late Pleistocene elements. No pyrite is observed within the polycrystalline lamellar ultrastructure of the trabeculae. The Late Pleistocene "pyritization" took place during oxygen deficient periods at the sediment-water interface or within the reduced zone of the topmost sediment.

scholarly journals Catalogue of Pests and Pathogens of Trees on the Island of Ireland

2020 ◽  
Author(s):  
Richard O'Hanlon ◽  
Cathal Ryan ◽  
James Choiseul ◽  
Archie K. Murchie ◽  
Christopher Williams
Keyword(s):  
Northern Ireland ◽  
Policy Making ◽  
Invasive Plant ◽  
Plant Health ◽  
Plant Pests ◽  
Plant Pest ◽  
International Regulations ◽  
History Of ◽  
Native Invasive ◽  
Research And Policy

Trees provide key ecosystem services, but the health and sustainability of these plants is under increasing biotic and abiotic threat, including from the growing incidences of non-native invasive plant pests (including pathogens). The island of Ireland (Ireland and Northern Ireland) is generally accepted to have a high plant health status, in part due to its island status and because of the national and international regulations aimed at protecting plant health. To establish a baseline of the current pest threats to tree health for the island of Ireland, the literature and unpublished sources were reviewed to produce a dataset of pests of trees on the island of Ireland. The dataset contains 396 records of pests of trees on the island of Ireland, the majority of pests being arthropods and fungi, and indicating potentially more than 44 non-native pest introductions. The reliability of many (378) of the records was judged to be high, therefore the dataset provides a robust assessment of the state of pests of trees recorded on the island of Ireland. We analyse this dataset and review the history of plant pest invasions, including (i) discussion on notable native and non-native pests of trees, (ii) pest interceptions at borders and (iii) pests and climate change. The dataset establishes an important baseline for the knowledge of plant pests on the island of Ireland, and will be a valuable resource for future plant health research and policy making.

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