The ledmorite dike of Achmelvich, near Lochinver, Sutherland

1952 ◽  
Vol 29 (216) ◽  
pp. 827-832
Author(s):  
P. A. Sabine
Keyword(s):  
Thin Section ◽  
Present Note ◽  
Geological Survey ◽  
North West

In the Geological Survey memoir a dike is recorded cutting the Lewisian gneiss near Achmelvich, north-west of Lochinver, Sutherland. At the time the mapping was carried out no thin section was prepared of the rock, and the dike was presumed to be a continuation of the Canisp porphyry dike which is exposed in the river Inver near Lochinver and farther south-east.During an investigation of the post-Cambrian sills and dikes of Assynt and the adjoining districts of north-west Scotland, the writer examined the Achmelvich dike in some detail and recognized its affinities with the nepheline-syenites. It is the purpose of the present note to describe the field occurrence and petrography of the dike.

Upernavik 98: reconnaissance mineral exploration in North-West Greenland

1999 ◽  
pp. 39-45 ◽  
Author(s):  
Bjørn Thomassen ◽  
Johannes Kyed ◽  
Agnete Steenfelt ◽  
Tapani Tukiainen
Keyword(s):  
Mineral Exploration ◽  
Mining Industry ◽  
Field Work ◽  
Geological Survey ◽  
Original Series ◽  
West Greenland ◽  
North West ◽  
One Year

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Thomassen, B., Kyed, J., Steenfelt, A., & Tukiainen, T. (1999). Upernavik 98: reconnaissance mineral exploration in North-West Greenland. Geology of Greenland Survey Bulletin, 183, 39-45. https://doi.org/10.34194/ggub.v183.5203 _______________ The Upernavik 98 project is a one-year project aimed at the acquisition of information on mineral occurrences and potential in North-West Greenland between Upernavik and Kap Seddon, i.e. from 72°30′ to 75°30′N (Fig. 1A). A similar project, Karrat 97, was carried out in 1997 in the Uummannaq region 70°30′–72°30′N (Steenfelt et al. 1998a). Both are joint projects between the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, and wholly funded by the latter. The main purpose of the projects is to attract the interest of the mining industry. The field work comprised systematic drainage sampling, reconnaissance mineral exploration and spectroradiometric measurements of rock surfaces.

II.—Notes on the Pleistocene of the North-West Territories of Canada, North-West and West of Hudson Bay

1894 ◽  
Vol 1 (9) ◽  
pp. 394-399 ◽  
Author(s):  
J. Burr Tyrrell
Keyword(s):  
Geological Survey ◽  
Hudson Bay ◽  
North West ◽  
The Past ◽  
North Shore ◽  
The North ◽  
South West ◽  
North West Territories

In the extreme northernmost part of Canada, lying between North Latitudes 56° and 68° and West Longitudes 88° and 112°, is an area of about 400,000 square miles, which had up to the past two years remained geologically unexplored.In 1892 the Director of the Geological Survey of Canada sent the writer to explore the country north of Churchill River, and south-west of Lake Athabasca;in1893 the exploration was continued northward, along the north shore of Athabasca Lake

scholarly journals Investigations of detrital zircon, rutile and titanite from present-day Labrador drainage basins: fingerprinting the Grenvillean front

1969 ◽  
pp. 77-80
Author(s):  
Tonny B. Thomsen ◽  
Christian Knudsen ◽  
Alana M. Hinchey
Keyword(s):  
Newfoundland And Labrador ◽  
Sedimentary Basins ◽  
Geological Survey ◽  
Drainage Basins ◽  
Grenville Province ◽  
Collaborative Project ◽  
North West ◽  
North East ◽  
The North ◽  
Three Samples

A multidisciplinary provenance study was conducted on stream sediment samples from major rivers in the eastern part of Labrador, Canada (Fig. 1). Th e purpose was to fi ngerprint the sources that deliver material to the stream sediments and to the reservoir sand units deposited off shore in the sedimentary basins in the Labrador Sea. We used a multimineral U-Pb geochronological approach employing rutile and titanite in addition to zircon to obtain unbiased age data. Th e purpose of this was to characterise the diff erent igneous and metamorphic episodes that occurred in Labrador, which is an area with highly variable geology characterised by the Palaeoproterozoic south-eastern Churchill province in the north-west, the Archaean Nain plutonic suite in the north-east, the Palaeoproterozoic Makkovik province in the east and the Mesoproterozoic Grenville Province to the south. Th e fi eld work was carried out in 2012 and 2013 and the study is a collaborative project between the Geological Survey of Denmark and Greenland and the Geological Survey of Newfoundland and Labrador. In this paper we focus on three samples from the southern part of the study area where two parts of the Grenville orogeny are found (Fig. 1).

scholarly journals Field work in the north of the Ivisârtoq region, inner Godthåbsfjord, southern West Greenland

1983 ◽  
Vol 115 ◽  
pp. 49-56
Author(s):  
B Chadwick ◽  
M.A Crewe ◽  
J.F.W Park
Keyword(s):  
Field Work ◽  
Geological Survey ◽  
West Greenland ◽  
North West ◽  
The North ◽  
Field Investigations ◽  
New Findings ◽  
Host Rocks

The programme of field investigations in the north of the Ivisartoq region begun in 1981 by Chadwick & Crewe (1982) was continued in 1982. Julia Park began mapping the Taserssuaq granodiorite, its host rocks and the Ataneq fault in the north-west. Dur team was joined by D. Bellur, Geological Survey of India, nominally as an assistant. In this report we present only summary notes of new findings relevant to the interpretation of the geometry and chronology of this segment of the Archaean crust in southern West Greenland. We use the established terminology for the Archaean rocks of the Godthåbsfjord region.

Comments on a Site in the St. Marks National Wildlife Refuge, Wakulla County, Florida

1947 ◽  
Vol 13 (2) ◽  
pp. 182-183 ◽  
Author(s):  
John W. Griffin
Keyword(s):  
Present Note ◽  
Copper Plate ◽  
Geological Survey ◽  
Recent Issue ◽  
National Wildlife Refuge ◽  
American Antiquity ◽  
Wildlife Refuge ◽  
A Site

In a recent issue of American Antiquity John M. Goggin has described certain materials from a site in the St. Marks National Wildlife Refuge, Wakulla County, Florida. The present note is a continuation of Goggin's remarks, based on certain materials not available to him at the time of his writing, and on a more recent surface collection of sherds from the site.Goggin mentions a copper plate ornamented by incision, having human and animal figures depicted on the surface, which he had not seen. When this object was originally found in 1938 by Bill Kary of Tallahassee, it was examined by J. Clarence Simpson of the Florida Geological Survey. Simpson made a cast of the object, as well as a detailed drawing. The drawing reproduced in this note (Fig. 41, b) was made from Simpson's sketch and a copy of the cast in the possession of Dr. Mark F. Boyd of Tallahassee. The writer is grateful to both of these gentlemen for the use of their material.

IX.—The Dynamics of the Formation of Cone-sheets, Ring-dykes, and Caldron-subsidences

1937 ◽  
Vol 56 ◽  
pp. 128-157 ◽  
Author(s):  
E. M. Anderson
Keyword(s):  
The Other ◽  
Geological Survey ◽  
Main Body ◽  
North West ◽  
Continuous Curves

A System of intrusions of the type now known as cone-sheets was first definitely recognized and mapped by Harker in the Cuillin district of Skye, and was described by him in the Geological Survey memoir issued in 1904. The members of the complex were simply designated “inclined sheets,” but they incline inwards towards a common centre from north, west, south, and south-east. When the Scottish Survey undertook the mapping of Mull, in the years preceding the war, two further series of centrally inclined intrusions were soon recognized. Owing to the number of these sheets, and consequent liability to confusion, individual members can seldom be traced very far, or shown to have arcuate curvature. But the systems as a whole sweep round centres in continuous curves. In one case the curve was originally closed, though it has been somewhat interrupted by later intrusions. In the other case the main body of sheets only forms a horse-shoe. Nevertheless the term cone-sheets, which was here applied to these intrusions by Professor Bailey, is extremely appropriate.

On a Boring at Roddymoor Colliery, near Crook, Co. Durham

1923 ◽  
Vol 60 (2) ◽  
pp. 50-62 ◽  
Author(s):  
David Woolacott
Keyword(s):  
Geological Survey ◽  
Considerable Importance ◽  
Lower Carboniferous ◽  
North West ◽  
Good Fortune ◽  
North Eastern

A boring that was completed in 1921 by Messrs. Pease and Partners, at Roddymoor Colliery, near Crook, Co. Durham, about 5 miles north-west of Bishop Auckland, is of considerable importance. I had the good fortune to be consulted in connexion with the correlation of the strata in the lower part of the section, and was also allowed to make a thorough examination of the whole of the cores. The stratigraphical results are of much interest, and it is mainly with these I propose to deal in this paper. Mr. R. G. Carruthers, of H.M. Geological Survey, also examined the cores, and on his suggestion they were broken up and the fossils in them collected by Mr. Tate, of the Survey. It is hoped that when these are determined, results may be obtained which will aid the zonal classification and correlation of the Lower Carboniferous rocks of the two north-eastern counties.

scholarly journals IV.—On the Discovery of a Skeleton of the Hippopotamus in Post-pliocene Drift near Motcomb, Dorset

1869 ◽  
Vol 6 (59) ◽  
pp. 206-208
Author(s):  
T. Thompson
Keyword(s):  
Thin Section ◽  
Geological Survey ◽  
Green Sand ◽  
Weak State ◽  
Small Section ◽  
Short Time ◽  
Bison Priscus ◽  
Horn Core ◽  
Leg Bones

The existence of Post-pliocene deposits in this neighbourhood has until lately been quite unknown, nothing of the kind having been detected either by the Geological Survey or subsequent observers. However, in tlie winter of 1866, a small section was exposed in a brick-field situated on a low rising-ground at the first milestone out of Shaftesbtiry towards Gillingham, and known as Hawkers' Hill. The clay here dug for brickmaking is Kimmeridge, presenting fossilized bones of the Pliosaurus and Icthyosaurus, and very friable remains of an Ammonite, etc. The attention of the writer was first attracted to the Drift on observing, above part of the Kimmeridge clay, a thin section of soil of an ochreous tint due to oxide of iron, and somewhat resembling the loose stratum of chert and sand which caps the neighbouring Green-sand rock. He learnt on inquiring of the labourers that they had recently found some large bones in this deposit, but thinking them of no use they had wheeled them off with the rubbish, in which they then lay, efiectually re-buried. Much interested at this announcement, he induced the men again to remove the rubbish, and found that the bones were some vertebræ of a large mammalian animal, together with fragments of the ribs and leg-bones. They were, of course, not at all fossilized, and their original weak state had been sadly aggravated by a second burial and disinterment. Nothing more was turned out that winter, and it was not until the end of 1867, that digging was resumed. Further portions of the same skeleton were now found, including another instalment of vertebræ, and portions of the skull and jaws. With the latter were several teeth in a suffciently entire state to show that the creature weis undoubtedly a Hippopotamus; numerous fragments of the tusks affording further proof of this. The writer now frequently visited and watched “the diggings,” and after a short time two horn-cores, considerable portions of the skull, and some fragments of the leg-bones of Bison priscus of unusual size came to light. The more perfect horn-core is 18 inches long and 14: inches in diameter at the base.

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