scholarly journals IV.—The Geology of the Dolgelley Gold-belt, North Wales

1910 ◽  
Vol 7 (4) ◽  
pp. 159-171 ◽  
Author(s):  
Arthur R. Andrew

The town of Dolgelley lies slightly outside the main tract of gold-bearing country of Merionethshire, but it forms a convenient headquarters from which to visit the various gold-mines and auriferous lodes. The Dolgelley Gold-belt lies within the area covered by the quarter-sheets 27 N.E., 27 S.E., 32 S.E., 33 N.W., 33 N.E., 33 S.W., 36 N.W., 36 N.E. of the 6 inch Ordnance Survey maps of Merionethshire. It is on the north side of the estuary of the Mawddach, extending from the sea at Barmouth to the locality of Gwynfynydd on the north-east. The belt forms the south-eastern flank of a range of high ground sloping down to the south and south-east from the mountains of Rhinog, Diphwys, and Garn. It is drained by several tributaries of the Mawddach, of which the principal are the Afons Hirgwm, Cwm-llechen, Cwm-mynach, Wnion, Las, Gamlan, Eden, and Gain.

Africa ◽  
1977 ◽  
Vol 47 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Fremont E. Besmer

IntroductionThe town of Ningi is located on the western edge of the North East State of Nigeria, about 25 km from the south-eastern corner of Kano State. Old Ningi town (about 50 km from the town's present site) was founded by a Kano Qur'anic teacher-scholar, Malam Hamza, and his followers in the middle of the nineteenth century. Malam Hamza is said to have fled Kano because of political and religious disputes with the Emir of Kano which resulted in a purge of the Malam class. Moving away from the centre of Kano power to the comparative safety of the Kabara hills and the non-Hausa people who lived in them, Malam Hamza was able to establish the separatism he and his followers desired. During this period the Kabara hills were the scene of slave-raiding and warfare, constantly threatened by the Hausa-Fulani emirates which surrounded them. Fighting from the hills, the people of Old Ningi, loosely allied with their neighbours, the Butawa, Warjawa, and others, were able to maintain their independence from Bauchi, Zaria, and Kano.


1934 ◽  
Vol 14 (4) ◽  
pp. 417-421 ◽  
Author(s):  
A. E. Preston

About 80 yds. to the north-east of an old house known as ‘Fitzharry's’ on the northern outskirts of the town of Abingdon is an early Norman moated mound in a good state of preservation. The mound is formed by the upcast of the encircling ditch and is covered with trees; it is roughly circular in shape, the axis from north to south measuring about 78 ft. and from west to east about 68 ft. At present the mound stands up about 10 ft. above the ordinary water-level. The moat is still (except in times of drought) filled with water supplied by an adjacent streamlet, an arm of which formerly appears to have entered the moat on the northern side. This entrance has since partly silted up but is plainly discernible. After flowing through the moat, the water rejoined the original stream at the south-east corner. The exit and the intake form at present only one channel. Originally there were separate channels. The mound and moat duly appear on the Ordnance Survey plans of 1875, and to the east is a tongue of land which may have served as a rudimentary bailey; in its present state it is roughly pear-shaped and much smaller than most of the known examples of the Norman bailey. On the further face of this tongue the streamlet surrounding it widens out considerably. Originally both the mound and the tongue were entirely enclosed by water, which, pursuing its course, descended through the town and fell into the Thames at Abingdon Bridge. On its way the streamlet served till recent times as a parish boundary.


1932 ◽  
Vol 69 (5) ◽  
pp. 209-233 ◽  
Author(s):  
G. D. Osborne

THE Carlingford-Barnave district falls within the boundaries of Sheet 71 of the Ordnance Survey of Ireland, and forms part of a broad promontory lying between Carlingford Lough on the north-east and Dundalk Bay on the south-west. The greater part of this promontory is made up of an igneous complex of Tertiary age which has invaded the Silurian slates and quartzites and the Carboniferous Limestone Series. This complex has not yet been investigated in detail, but for the purposes of the present paper certain references to it are necessary, and these are made below. The prevalence of hybrid-relations and contamination-effects between the basic and acid igneous rocks of the region is a very marked feature, and because of this it has been difficult at times to decide which types have been responsible for the various stages of the metamorphism.


1916 ◽  
Vol 3 (10) ◽  
pp. 435-441 ◽  
Author(s):  
G. W. Tyrrell

The new material on which this paper is based has lately been received through Mr. D. Ferguson, who recently investigated the geology of the island, and collected the rocks described in an earlier paper. It consists of twenty-seven rock specimens from the south-eastern end of the island, between Cape Disappointment and Cooper Island, and nine specimens from Gold Harbour on the north-east coast between Cooper Island and Royal Bay. All these were collected by the staff of the South Georgia Co., Ltd., under the instructions of Mr. Th. E. Salvesen, managing director, of Leith.


1906 ◽  
Vol 12 ◽  
pp. 415-430
Author(s):  
Ramsay Traquair

In plan the walls surrounding the Acropolis of Sparta form an irregular oblong, terminated to the east and west by two small hills which formed citadels or outlook points. Though no single complete part remains, and in many places the walls are levelled to the ground, the lines can still be traced fairly completely. (Plate VIII. 3.)At the south eastern corner are the ruins of a Roman Stoa of the Imperial period (A). They shew a series of small compartments (Fig. 1), covered with barrel vaults, ten on either side of three larger central rooms, which are roofed with crossgroined vaults and large semicircular niches at the back. The ground on the north side is as high as the vaults and originally must have formed a terrace overlooking the street on to which the Stoa opened on its south side.


2021 ◽  
Author(s):  
Vlad-Alexandru Amihăesei ◽  
Lucian Sfîcă ◽  
Alexandru Dumitrescu

<p>The south-eastern part of the European continent is known as a region where the types of climate are hard to be delimited, being indicated by Trewartha since 1961 among the so-called Earth's Climate Problem regions of the world. This is given especially by its position at the merges of arid and cold climate of the temperate zone in Europe. Taking to account this aspect, it is not surprisingly that after almost 100 years of climate classification attempts, there is still no agreement regarding the climate type of Romania and its corresponding subdivisions. Even if a weak majority of the Romanian climatologists plead for a temperate continental climate, some others consider that Romania has a typically temperate transitional climate specific for central Europe. However, most of previous regionalizations are highly subjective with no proper quantitative assessment of climate conditions. </p><p>In our study a climate regionalization of Romania’s territory is proposed, based on an objective approach. For this purpose, 9 monthly climate parameters extracted from interpolation gridded data sets (ERA-5 land and ROCADA) were used.</p><p>The regionalization was performed by mixing two objective methods. Firstly, all the 108 input variables were reduced at 8 major factors using factor analysis. Secondly, those factors were used in a k-means clustering method and a new scheme of climate regionalization of Romanian territory was obtained. Through this, we succeed to delimitate 8 different climate subtypes within Romania's territory which we aggregated firstly in 2 major zonal climate types: (i) temperate transitional climate (TTC) from maritime to continental type, extended in the north-east part of Romania and (ii) temperate orographically sheltered climate (TOSC) with 2 major subtypes. The first sub-type of TOSC is extended within the Carpathian mountain arch (an extension of pannonian climate) and the second one covers the romanian part of the region between Carpathian and Balkan Mountain (lower danubian climate). Besides these two zonal types the major landforms of Romania impose specific climate conditions: (iii) the Carpathian mountains and sub-mountains area have their own climate features (CMSC) with 3 climate subtypes (precarpathian, eastern Carpathian and alpine climates), while the (iv) Black Sea shapes the main climate conditions of the south-eastern side of the country especially along the coast with 2 climate subtypes (ponto-deltaic and western pontic type). The main features of these climate types/subtypes are presented in detailed in the study.</p><p>In the meantime, the proposed climate regionalization covers partially the neighbor countries in an attempt to homogenize the different national perspectives on the climate types along the states boundaries in central and south-eastern Europe.</p>


1966 ◽  
Vol 6 (1) ◽  
pp. 7
Author(s):  
T. J. Brady ◽  
W. Jauncey ◽  
C. Stein

An estimated total of over 20,000 feet of Palaeozoic sediments accumulated in the Bonaparte Gulf Basin. The thickest known continuous section is that in Bonaparte No. 1 Well, abandoned at 10,530 feet in Upper Devonian sandstone and shale. Rocks of the Basin margins are mainly sandstones and limestones (in part reef), whereas a thick shale section has been discovered in the deeper parts. Data from recent seismic surveys indicate that the seaward extension of the Basin is considerable and that a thick pile of sediments is preserved there.The Bonaparte Gulf Basin formed as a result of subsidence of the north-eastern part of the Kimberley Block along fault lines associated with the Halls Creek Mobile Zone. This zone borders the south-eastern margin of the Basin and trends north-east. One basement block, represented by the presentday Pincombe Range, remained relatively high. The Bonaparte Gulf Basin can be divided into two subsidiary basins, the Carlton Basin to the west and north-west and the Burt Range Basin in the east and south-east. The Pincombe Range separates the two.Marine sediments were deposited in the Carlton Basin during the Middle and Upper Cambrian, Lower Ordovician, Upper Devonian and Lower Carboniferous epochs. Angular unconformities have been mapped between the Lower Ordovician and Upper Devonian rocks, and between Upper Devonian and Lower Carboniferous rocks. In the Burt Range Basin, deposition began in the Upper Devonian and continued with minor breaks through the Lower Carboniferous. Faults along the south-eastern margin were active through this period and affected the character of the sediments.Permian sediments are widely distributed and lie with unconformity on older units.


1928 ◽  
Vol 8 (3) ◽  
pp. 300-326 ◽  
Author(s):  
R. E. M. Wheeler

About two hundred and fifty yards west of Harlow railway-station, in the Essex border-parish of Latton (Ordnance Survey 6-in. map, XLI, NW.), a small gravel-capped oval hill known as Stanegrove or Standing Groves rises to a height of some 20 ft. above the marshy banks of the river Stort. In 1764 and again in 1819 ‘very strong walls’ were observed here; and other foundations ‘evidently Roman’, tesserae, many other Roman relics, and a stone coffin are recorded to have been discovered in the fields extending for a mile to the north-east, more particularly during excavations for gravel within 250 yards of the mound itself. Coffins thought to be of Roman date were found also near the station when the railway was built in 1841 and were re-buried in the station-yard. Amongst the finds from the area are specially noted ‘a great number of Roman coins chiefly of Emperors from the first Claudius to Valentinian’, including ‘several silver pieces of Sabina, Faustina the Elder, and Constantinus Junior’, and a few British, of which the following are specified: (1) one with a helmeted head, with CUNOBELINA; reverse, a hog and TASCHOVANIT (sic); (2) another ‘with a head on one side; on the other a man striking upon an anvil; (3) ‘one with a star, between the rays of which are the letters VERLAMIO; reverse, an ox’. The general character of the evidence closely resembles that obtained from similar riverside gravels in many parts of south-eastern Britain, and indicates a fairly extensive and continuous occupation, perhaps not of a very high order, from later prehistoric times to the last quarter of the fourth century.


1925 ◽  
Vol 5 (1) ◽  
pp. 80-82
Author(s):  
Prescott Row

The old manor of Waddon is part of the Parish of Croydon and lies to the south west of the Parish Church of that town. Here at the head of the Wandle River there are many evidences of a wide spread population in prehistoric times and the fields on the lower slopes of the North Downs which steadily rise from Waddon Station towards Purley are littered with flakes and have yielded many implements.The particular site to which I draw the attention of the Society, and indicate as the Cedars Estate, is easily reached by the bridle path running westward by Waddon Mill on the banks of the river, and the section under discussion, is the north east corner of the plot marked as Brandy Bottle Hill on the six inch Ordnance Survey. A hillock of Thanet sand here rises and extends eastward over the next field, the top of which is some 140 feet above sea level and makes a vantage spot with a good look out, over the wide stretches of the level plain running north from the present course of the Wandle river, in early times no doubt a stretch of marshland. It is still called Waddon Marsh.


Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 291
Author(s):  
Andrei V. Prokopiev ◽  
Victoria B. Ershova ◽  
Daniel F. Stockli

We performed U-Pb dating of detrital zircons collected from Middle–Upper Jurassic strata of the Sugoi synclinorium and Cretaceous rocks of the Omsukchan (Balygychan-Sugoi) basin, in order to identify their provenance and correlate Jurassic–Cretaceous sedimentation of the south-eastern Verkhoyansk-Kolyma orogenic belt with various magmatic belts of the north-east Asia active margins. In the Middle–Late Jurassic, the Uda-Murgal magmatic arc represented the main source area of clastics, suggesting that the Sugoi basin is a back-arc basin. A major shift in the provenance signature occurred during the Aptian, when granitoids of the Main (Kolyma) batholith belt, along with volcanic rocks of the Uyandina-Yasachnaya and Uda-Murgal arcs, became the main sources of clastics deposited in the Omsukchan basin. In a final Mesozoic provenance shift, granitoids of the Main (Kolyma) batholith belt, along with volcanic and plutonic rocks of the Uyandina-Yasachnaya and Okhotsk-Chukotka arcs, became the dominant sources for clastics in the Omsukchan basin in the latest Cretaceous. A broader comparison of detrital zircon age distributions in Jurassic–Cretaceous deposits across the south-eastern Verkhoyansk-Kolyma orogen illustrates that the Sugoi and Omsukchan basins did not form along the distal eastern portion of the Verkhoyansk passive margin, but in the Late Mesozoic back-arc basins.


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