scholarly journals A Lower Devonian age for the Corvock Granite and its significance for the structural history of South Mayo and the Laurentian margin of western Ireland

2021 ◽  
Author(s):  
John Graham ◽  
Nancy Riggs
Keyword(s):  
Lower Devonian ◽  
Early Devonian ◽  
North East ◽  
The North ◽  
Granite Emplacement ◽  
History Of ◽  
Western Ireland ◽  
Laurentian Margin ◽  
Devonian Age ◽  
Restraining Bend

The Silurian Croagh Patrick succession, which crops out just south of a fundamental Caledonian structural zone near Clew Bay, western Ireland, is a series of psammites and pelites with a strong penetrative cleavage. These rocks are intruded by the Corvock granite. A suite of minor intrusions associated with the granite contains the regional cleavage whereas the Corvock granite is undeformed. New U-Pb dates are 413 + 7 / -4 Ma for a strongly cleaved sill and 410 ± 4 Ma for the main granite and closely constrain the age of crystallization of the granite and coeval cleavage formation as Lower Devonian (Lochkovian or Pragian), implying syn- to late-kinematic granite emplacement. These data are consistent with evidence for strong sinistral shear shown by the Ox Mountains granodiorite just to the north-east dated at 412.3 ± 0.8 Ma. This Devonian cleavage is superimposed on Ordovician rocks of the South Mayo Trough. The localisation of the strong deformation is interpreted as being due to its position at a restraining bend during regional sinistral motion on a segment of the Fair Head-Clew Bay Line to the north. Contemporaneous deformation in the syn-kinematic Donegal batholith suggests a transfer of sinistral motion to this intra-Grampian structure rather than simple along-strike linkage to the Highland Boundary Fault in Scotland. Our new data indicate diachronous deformation during the late Silurian and early Devonian history of the Irish and Scottish Caledonides and also support previous interpretations of diachronous deformation between these areas and the Appalachian orogens.

A Lower Devonian sporomorph assemblage from the Midland Valley of Scotland

1993 ◽  
Vol 84 (2) ◽  
pp. 117-136 ◽  
Author(s):  
Charles H. Wellman
Keyword(s):  
West Coast ◽  
Regional Variation ◽  
Lower Devonian ◽  
Small Scale ◽  
The West ◽  
Early Devonian ◽  
North East ◽  
The North ◽  
Early Late

AbstractA sporomorph assemblage recovered from the Sandy's Creek Beds, which constitute a diminutive fault bounded inlier on the west coast of the Midland Valley of Scotland, is described. Four species of trilete spore and the genus Fustisispora, a monospecific cryptospore genus, are proposed as new. The sporomorph assemblage is attributed an early Devonian, late–early to early–late Lochkovian age, and is interpreted as accumulating in a continental environment. The Sandy's Creek Beds are correlated herein with the upper part of the Arbuthnott Group which crops out in the north-east of the Midland Valley. Comparison with other sporomorph assemblages of similar age indicates that minor regional variation exists. It is suggested that this is related to small-scale regional variation in the composition of vegetation.

Ras al Khaimah: further archaeological discoveries

Antiquity ◽  
1976 ◽  
Vol 50 (200) ◽  
pp. 216-222
Author(s):  
Beatrice De Cardi
Keyword(s):  
United Arab Emirates ◽  
The State ◽  
Focused Attention ◽  
North East ◽  
The North ◽  
History Of ◽  
The City

Ras a1 Khaimah is the most northerly of the seven states comprising the United Arab Emirates and its Ruler, H. H. Sheikh Saqr bin Mohammad al-Qasimi, is keenly interested in the history of the state and its people. Survey carried out there jointly with Dr D. B. Doe in 1968 had focused attention on the site of JuIfar which lies just north of the present town of Ras a1 Khaimah (de Cardi, 1971, 230-2). Julfar was in existence in Abbasid times and its importance as an entrep6t during the sixteenth and seventeenth centuries-the Portuguese Period-is reflected by the quantity and variety of imported wares to be found among the ruins of the city. Most of the sites discovered during the survey dated from that period but a group of cairns near Ghalilah and some long gabled graves in the Shimal area to the north-east of the date-groves behind Ras a1 Khaimah (map, FIG. I) clearly represented a more distant past.

scholarly journals Palynological indications for Silurian – earliest Devonian age strata in the Netherlands

2021 ◽  
Vol 100 ◽  
Author(s):  
Alexander J.P. Houben ◽  
Geert-Jan Vis
Keyword(s):  
The Netherlands ◽  
Core Material ◽  
Late Devonian ◽  
Time Interval ◽  
The South ◽  
Early Devonian ◽  
The North ◽  
Depositional Settings ◽  
Palynological Study ◽  
Devonian Age

Abstract Knowledge of the stratigraphic development of pre-Carboniferous strata in the subsurface of the Netherlands is very limited, leaving the lithostratigraphic nomenclature for this time interval informal. In two wells from the southwestern Netherlands, Silurian strata have repeatedly been reported, suggesting that these are the oldest ever recovered in the Netherlands. The hypothesised presence of Silurian-aged strata has not been tested by biostratigraphic analysis. A similar lack of biostratigraphic control applies to the overlying Devonian succession. We present the results of a palynological study of core material from wells KTG-01 and S05-01. Relatively low-diversity and poorly preserved miospore associations were recorded. These, nonetheless, provide new insights into the regional stratigraphic development of the pre-Carboniferous of the SW Netherlands. The lower two cores from well KTG-01 are of a late Silurian (Ludlow–Pridoli Epoch) to earliest Devonian (Lochkovian) age, confirming that these are the oldest sedimentary strata ever recovered in the Netherlands. The results from the upper cored section from the pre-Carboniferous succession in well KTG-01 and the cored sections from the pre-Carboniferous succession in well S05-01 are more ambiguous. This inferred Devonian succession is, in the current informal lithostratigraphy of the Netherlands, assigned to the Banjaard group and its subordinate Bollen Claystone formation, of presumed Frasnian (i.e. early Late Devonian) age. Age-indicative Middle to Late Devonian palynomorphs were, however, not recorded, and the overall character of the poorly preserved palynological associations in wells KTG-01 and S05-01 may also suggest an Early Devonian age. In terms of lithofacies, however, the cores in well S05-01 can be correlated to the upper Frasnian – lower Famennian Falisolle Formation in the Campine Basin in Belgium. Hence, it remains plausible that an unconformity separates Silurian to Lower Devonian strata from Upper Devonian (Frasnian–Famennian) strata in the SW Netherlands. In general, the abundance of miospore associations points to the presence of a vegetated hinterland and a relatively proximal yet relatively deep marine setting during late Silurian and Early Devonian times. This differs markedly from the open marine depositional settings reported from the Brabant Massif area to the south in present-day Belgium, suggesting a sediment source to the north. The episodic presence of reworked (marine) acritarchs of Ordovician age suggests the influx of sedimentary material from uplifted elements on the present-day Brabant Massif to the south, possibly in relation to the activation of a Brabant Arch system.

V. Mr. Pegge, on the Rudston Pyramidal Stone

Archaeologia ◽  
1779 ◽  
Vol 5 ◽  
pp. 95-97
Author(s):  
Pegge
Keyword(s):  
North East ◽  
The North ◽  
Great Height ◽  
History Of ◽  
The Town ◽  
The Church

Rudston, a village in the East-Riding of Yorkshire, on the Wolds, near Burlington, is thus noticed in bishop Gibson's edition of Camden, col. 901. “More inward into the “land, is Ruston, where, in the church-yard, is a kind of “pyramidal stone of great height. Whether the name of the “town may not have some relation to it, can be known only “from the private history of the place; but if the stone bear “any resemblance to a cross, rod in Saxon doth imply so much.” This cross, as the bishop calls it, and I think not improperly, is a very curious monument; and, no doubt, of very remote antiquity. I am not aware that it has ever been engraved, and therefore I here present the Society with an accurate drawing* of it, which I received A. 1769, from the friendly hand of Mr. Willan, whose account I shall take the liberty to subjoin. “This stone stands about four yards from the North East “corner of Rudston church, which is situated on a high hill. “Its depth under ground equal to its height above, as appeared “from an experiment made by the late Sir William Strickland. “All the four sides are a little convex, and the whole covered “with moss. No tradition in this country of any authorrity, either concerning the time, manner, or occasion of its “erection.”

scholarly journals Historical Myths or Mythological History: A Fresh Approach to Understand the History of Assam

2014 ◽  
Vol 2 (3) ◽  
pp. 61 ◽  
Author(s):  
Pranab Jyoti Sarma
Keyword(s):  
Oral Traditions ◽  
Cultural Dynamics ◽  
Indian History ◽  
North East ◽  
The North ◽  
East Region ◽  
History Of ◽  
Recent Trends ◽  
Historical Writings ◽  
Material Evidence

This paper carries out a critical review of the trends of historical writings in Assam. The historiographical study reveals that the beginning of the historical phase was, in fact, late in the North East region. Moreover, in many of these historical writings, the importance of the local histories of the communities of the region was ignored. The author highlights the fact that a pan-Indian history for the region may not be authentic enough to understand the cultural dynamics of the complex society of the Northeast. The author also focuses on corroborating ‘proper’ historical source material for reconstructing the history of the region rather than deriving inferences from mythology and legends. However, the importance of recent trends in historiography such as selective utilisation of oral traditions, folklores and memory studies has been emphasised. An alternative and more precise periodisation of the historical phase has been provided which does not, however, project any clear marker between periods and eras but emphasises on slow and steady transformations. Importance of archaeological sources and material evidence has been kept in mind while deriving periodical divisions. Relooking at the history of the Koches, Kacharis has been emphasised.

scholarly journals О геологическом и изотопном возрасте золоторудных месторождений на примере золото-серебряного месторождения Кубака (Северо-Восток России)

2021 ◽  
pp. 3-12
Author(s):  
V. A. Stepanov ◽  
Keyword(s):  
Gold Mineralization ◽  
Early Carboniferous ◽  
North East ◽  
The North ◽  
Ore Bodies ◽  
Geological Age ◽  
Gold Silver ◽  
Devonian Age ◽  
Isotope Dating ◽  
Silver Mineralization

Information on the geological and isotopic age of the Kubaka gold-silver deposit in the Omolon middle massif in the North-East of Russia is presented. It has been established that the Kubaka deposit geological age lies in between the Late Devonian age of the Kedon series volcanites, containing the gold-silver mineralization, and the Early Carboniferous age of the Korbinsky suite terrigenous rocks, overlapping the volcanites and the mineralization. The post-ore nature of the Omolon complex dykes, which produce no significant impact on the distribution of gold mineralization in ore bodies, is shown. According to isotope dating, the following stages of the Kubaka deposit formation are distinguished: the accumulation of the Kubaka suite tuffs (369 Ma); the introduction of subvolcanic intrusions (344 and 337 Ma); the formation of ore metasomatites (335±5 Ma); the formation of gold-silver mineralization (330 and 334 - 324 Ma); the introduction of post-ore dikes (179±8 - 176±10 Ma).

LXXXIX. Observations upon a slight earthquake, tho' very particular which may lead to the knowlege of the cause of great and violent ones, that ravage whole countries, and overturn cities. Translated from the French

1757 ◽  
Vol 50 ◽  
pp. 645-648
Keyword(s):  
Natural History ◽  
North West ◽  
North East ◽  
The North ◽  
South West ◽  
History Of

I went to make my observation upon the natural history of the sea; and when I arrived at a place called the Cauldrons of Lance Caraibe, near Lancebertrand, a part of the island of Grande Terre Guadaloupe, in which place the coast runs north-east and south-west, the sea being much agitated that day flowed from the north-west.

Un diatrème phréatomagmatique montérégien dans les Appalaches du Québec

1996 ◽  
Vol 33 (5) ◽  
pp. 649-655
Author(s):  
David Morin ◽  
Michel Jébrak ◽  
Robert Marquis
Keyword(s):  
Surface Water ◽  
Country Rock ◽  
Near Surface ◽  
Metasedimentary Rocks ◽  
North East ◽  
The North ◽  
Devonian Age ◽  
Fault Network ◽  
Alkaline Lamprophyres ◽  
East West

A subcircular positive magnetic anomaly and breccias affecting a basanite and its country-rock metasedimentary rocks reveal the presence of a diatreme with a diameter of approximately 420 m, at Eastman, in the Quebec Appalachians. The post-Middle Devonian age, the position in the line of the Monteregian plutons, and the basanite composition, which is comparable to that of the Cretaceous Monteregian alkaline lamprophyres, suggest that the diatreme is related to the Monteregian magmatism. It is located at the junction of two orthogonal tectonic corridors: the north-north-east Baie Verte – Brompton line and an east−west fault network along the prolongation of the Ottawa−Bonnechère Graben. These structures are zones of weakness that probably served as a conduit for the ascending magma and near-surface water to trigger phreatomagmatic eruptions.

A History of Some of the International Fisheries Commissions

1972 ◽  
Vol 73 ◽  
pp. 361-390 ◽  
Author(s):  
D. H. Cushing
Keyword(s):  
World War Ii ◽  
Great Influence ◽  
World War ◽  
International Council ◽  
North West ◽  
North East ◽  
The North ◽  
Foreign Office ◽  
History Of ◽  
International Fisheries

This paper is an account of the development of the International Fisheries Commissions. Excluded are the commissions under the aegis of FAO: an earlier group, for example the Indo-Pacific Fisheries Commission, are only advisory, and later ones, like the Atlantic Tuna Commission, have not been in existence for long enough to discern characteristics in their activity. The activities of the Russo-Japanese commissions in the north-west Pacific are also excluded, because their actions do not have great influence on the older commissions or upon the newer ones established in the last five years or so. Although the International Council for the Exploration of the Sea has now only an advisory function in the North-East Atlantic Fisheries Commission, during its earlier history before World War II it was always able to act through the Danish Foreign Office. But a much more important point is that the International Council played a historically dominant part in the early development of many of the commissions, except of course those which originated in the north-east Pacific.

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