Late Pleistocene proboscideans and early Fraser glacial sedimentation in eastern Fraser Lowland, British Columbia

1982 ◽  
Vol 19 (5) ◽  
pp. 899-906 ◽  
Author(s):  
Stephen R. Hicock ◽  
Keith Hobson ◽  
John E. Armstrong
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Silty Sand ◽  
Glacial Lake ◽  
Glacial Ice ◽  
Strait Of Georgia ◽  
The North ◽  
North Side ◽  
History Of ◽  
Glacial Sedimentation

Three recently radiocarbon-dated tusk segments from eastern Fraser Lowland indicate Pleistocene proboscideans (probably mammoths) lived there between 22 700 and 21 400 years ago during early Fraser (for the Fraser Lowland) ice advance into the area. Palynomorphs from silty sand adhering to a tusk indicate the animals grazed on open grassy floodplain. Sedimentologic and altimeter studies of tusk-bearing gravel indicate an early Fraser sandur, at least 10 km long and deposited at the same time as Coquitlam Drift, formed in Chilliwack Valley at the same time that a sandur or kame terrace was deposited against the north side of Promontory ridge. Probably about 21 000 years ago (the time of Coquitlam glacial maximum in western Fraser Lowland) ice blocked Chilliwack Valley, creating a glacial lake whose freshwater, Pediastrum-bearing, laminated silt has been observed up to 200 m asl. Stratigraphy and history of the area following deposition of the above gravels and silt are still uncertain without more chronologic control. However, proboscideans could have migrated southward and westward, away from ice advancing into Fraser Lowland, across ancestral Strait of Georgia via the Quadra sandur, and onto southeastern Vancouver Island to which earliest Fraser glacial ice probably advanced after 17 000 years BP.

Quadra Sand and its relation to the late Wisconsin glaciation of southwest British Columbia

1976 ◽  
Vol 13 (6) ◽  
pp. 803-815 ◽  
Author(s):  
J. J. Clague
Keyword(s):  
British Columbia ◽  
Climatic Change ◽  
Late Pleistocene ◽  
Marine Sediments ◽  
Strait Of Georgia ◽  
Coast Mountains ◽  
Widespread Distribution ◽  
Source Areas ◽  
The North ◽  
Minimum Age

Quadra Sand is a late Pleistocene lithostratigraphic unit with widespread distribution in the Georgia Depression, British Columbia and Puget Lowland, Washington. The unit consists mainly of horizontally and cross-stratified, well sorted sand. It is overlain by till deposited during the Fraser Glaciation and is underlain by fluvial and marine sediments deposited during the preceding nonglacial interval.Quadra Sand was deposited progressively down the axis of the Georgia–Puget Lowland from source areas in the Coast Mountains to the north and northeast. The unit is markedly diachronous; it is older than 29 000 radiocarbon years at the north end of the Strait of Georgia, but is younger than 15 000 years at the south end of Puget Sound.Aggradation of the unit occurred during the climatic deterioration at the beginning of the Fraser Glaciation. Thick, well sorted sand was deposited in part as distal outwash aprons at successive positions in front of, and perhaps along the margins of, glaciers advancing from the Coast Mountains into the Georgia–Puget Lowland during late Wisconsin time.The sand thus provides a minimum age for the initial climatic change accompanying the Fraser Glaciation. This change apparently occurred before 28 800 y BP, substantially earlier than glacial occupation of the southern Interior Plateau of British Columbia. Thus, several thousand years may have intervened between the alpine and ice-sheet phases of the Fraser Glaciation.

A Carved Stone from D'Arcy, Saskatchewan

1940 ◽  
Vol 5 (4) ◽  
pp. 334-335
Author(s):  
Vladimar Alfred Vigfusson
Keyword(s):  
North America ◽  
Late Pleistocene ◽  
Glacial Lake ◽  
Bering Strait ◽  
The North ◽  
Gravel Pit ◽  
North Bank ◽  
The Town

In recent years, the attention of some archaeologists has been directed to the Canadian Northwest with the expectation of finding some evidence or indication of the early migrations of man on this continent. That man reached North America by Bering Strait from Asia, is generally accepted, but the theory that the migrations took place in late Pleistocene times and by way of an open corridor between the Keewatin ice and the Rockies, requires confirmation. It is significant that Folsom and Yuma points from Saskatchewan, described by E. B. Howard, were found mainly in areas bordering the ancient glacial Lake Regina.As a further contribution to this problem, it seems desirable to present a brief description of a carved stone relic found in gravel in central Saskatchewan about three years ago.The stone was found about seven miles southeast of the town of D'Arcy in a gravel pit located on Sec. 9, Tp. 28, Rge. 18, W. 3rd Meridian, on the north bank of a ravine running east into Bad Lake.

The Use and Construction History of Huaca Prieta, North Coast of Peru

2020 ◽  
pp. 101-128
Author(s):  
Tom D. Dillehay
Keyword(s):  
Late Pleistocene ◽  
North Coast ◽  
Marine Resources ◽  
Human Presence ◽  
Social Correlates ◽  
The North ◽  
History Of ◽  
Chicama Valley ◽  
North Coast Of Peru

Chapter 4 summarizes the construction, subsistence, and social correlates of Huaca Prieta, a mound site in the lower Chicama Valley on the north coast of Peru, from the earliest evidence of human presence in the Late Pleistocene (ca. 12,500 14C BP) through abandonment at 3,800 14C BP. Marine resources were important throughout the sequence, which saw an early advent of agriculture and increasing population, complexity, and monumentality.

scholarly journals Silicic volcanism in the Scottish Lower Carboniferous; lavas, intrusions and ignimbrites of the Garleton Hills Volcanic Formation, SE Scotland

2020 ◽  
Vol 56 (1) ◽  
pp. 63-79
Author(s):  
Brian G. J. Upton ◽  
Linda A. Kirstein ◽  
Nicholas Odling ◽  
John R. Underhill ◽  
Robert M. Ellam ◽  
...  
Keyword(s):  
Extensional Tectonics ◽  
Isotopic Data ◽  
Central Type ◽  
Lower Carboniferous ◽  
The North ◽  
Basaltic Magmatism ◽  
North Side ◽  
Volcanic Formation ◽  
History Of ◽  
Magmatic History

Extensional tectonics and incipient rifting on the north side of the Iapetus suture were associated with eruption of (mainly) mildly alkaline olivine basalts. Initially in the Tournaisian (Southern Uplands Terrane), magmatic activity migrated northwards producing the Garleton Hills Volcanic Formation (GHVF) across an anomalous sector of the Southern Uplands. The latter was followed by resumption of volcanism in the Midland Valley Terrane, yielding the Arthur's Seat Volcanic Formation. Later larger-scale activity generated the Clyde Plateau Volcanic Formation (CPVF) and the Kintyre lavas on the Grampian Highlands Terrane. Comparable volcanic successions occur in Limerick, Ireland. This short-lived (c. 30 myr) phase was unique in the magmatic history of the Phanerozoic of the British Isles in which mildly alkaline basaltic magmatism locally led to trachytic differentiates. The Bangly Member of the GHVF represents the largest area occupied by such silicic rocks. The most widespread lavas and intrusions are silica-saturated/oversaturated trachytes for which new whole-rock and isotopic data are presented. Previously unrecognized ignimbrites are described. Sparse data from the fiamme suggest that the magma responsible for the repetitive ignimbrite eruptions was a highly fluid rhyolite. The Bangly Member probably represents the remains of a central-type volcano, the details of which are enigmatic.

The Doors of the Chapel and the Keys to the Palace of Louis IX

2017 ◽  
Vol 76 (2) ◽  
pp. 175-196
Author(s):  
Meredith Cohen
Keyword(s):  
Medieval Architecture ◽  
Royal Palace ◽  
The North ◽  
North Side ◽  
Relative Chronology ◽  
History Of ◽  
Archival Documentation ◽  
And Function ◽  
Louis Ix ◽  
The Doors

The Doors of the Chapel and the Keys to the Palace of Louis IX considers two virtually unknown sculpted portals located in the second bay on the north side of the Sainte-Chapelle, the monumental reliquary chapel built by Louis IX in the royal palace of Paris between 1239 and 1248. Examining archaeological and archival documentation concerning these portals, Meredith Cohen provides important new insights about the initial design and function of the Sainte-Chapelle, its attendant structures, and the royal palace. After charting the history of the Chevesserie, the building to which the portals issued, Cohen proposes a relative chronology for the other structures in the palace attributed to Louis IX, arguing that construction of the Sainte-Chapelle generated major changes, which defined the palace as symbol of the royal state starting in the thirteenth century. This article contributes to the research in medieval architecture that views great monuments as part of highly complex historical topographies.

Electron microscope studies of minerals: phase boundaries in an extremely slowly cooled clinopyroxene (augite)

1983 ◽  
Vol 387 (1792) ◽  
pp. 21-30 ◽  
Keyword(s):  
Phase Interface ◽  
Intermediate Formation ◽  
High Resolution Electron Microscopy ◽  
Cooling History ◽  
The North ◽  
North Side ◽  
Resolution Electron ◽  
History Of ◽  
Ambient Surface ◽  
Good Agreement

High resolution electron microscopy has been used to study the nature of exsolution lamellae that developed during extremely slow and prolonged cooling and depressurization of an aluminium rich augite (high Ca clinopyroxene) taken from a layer of garnet-augite rich gneiss that outcrops on the north side of Scourie Bay, Sutherland, northwest Scotland. The parent clinopyroxene structure evolved with an average cooling rate of ca . 6 x 10 -6 K per year and an average depressurization rate of ca . 0.75 Pa per year over a span of ca . 2 x 10 9 years between 3.0 x 10 9 and 1.0 x 10 9 years ago, and was subsequently stored at close to ambient surface conditions. Three sets of lamellae, which probably formed mainly during the middle of this evolution, were identified as amphibole, pigeonite and hypersthene. Coherent amphibole lamellae, ca . 10 nm thick, exsolved parallel to (010) of the host augite whereas hypersthene formed thicker lamellae 150-250 nm wide, parallel to (100) augite. Again the phase interface is coherent but contains ledges, a few lattice spacings wide, of a pigeonite structure suggesting that the growth of the hypersthene lamellae proceeded via the intermediate formation of pigeonite. Pigeonite forms ca . 90 nm thick lamellae, which extend parallel to an irrational plane (7.96, 0, 1) of host augite at 12° to (100) augite, yet at the same time maintains a coherent interphase boundary. The angle between lamellae of this type and (100) of the host augite is known to be dependent upon composition of the host augite. The quoted value indicates a (Fe+Mn)/(Fe+Mn+Mg) ratio of 0.30 ± 0.05, in good agreement with microprobe data for the host augite, which fall in the range 0.372–0.382. The micrographs also indicate that hypersthene lamellae precede amphibole. The above observations have enabled the relation between the phases and the cooling history of the rock to be established.

Late Pleistocene history and geomorphology, southwestern Vancouver Island, British Columbia

1979 ◽  
Vol 16 (9) ◽  
pp. 1645-1657 ◽  
Author(s):  
Neville F. Alley ◽  
Steven C. Chatwin
Keyword(s):  
British Columbia ◽  
Continental Shelf ◽  
Late Pleistocene ◽  
Vancouver Island ◽  
Glacial Lakes ◽  
Small Lakes ◽  
Strait Of Georgia ◽  
Coast Mountains ◽  
Juan De Fuca ◽  
Juan De Fuca Strait

The major Pleistocene deposits and landforms on southwestern Vancouver Island are the result of the Late Wisconsin (Fraser) Glaciation. Cordilleran glaciers formed in the Vancouver Island Mountains and in the Coast Mountains had advanced down Strait of Georgia to southeastern Vancouver Island after 19 000 years BP. The ice split into the Puget and Juan de Fuca lobes, the latter damming small lakes along the southwestern coastal slope of the island. During the maximum of the glaciation (Vashon Stade), southern Vancouver Island lay completely under the cover of an ice-sheet which flowed in a south-southwesterly direction across Juan de Fuca Strait, eventually terminating on the edge of the continental shelf. Deglaciation was by downwasting during which ice thinned into major valleys and the strait. Most upland areas were free of ice down to an elevation of 400 m by before 13 000 years BP. A possible glacier standstill and (or) resurgence occurred along Juan de Fuca Strait and in some interior upland valleys before deglaciation was complete. Glacial lakes occupied major valleys during later stages of deglaciation.

scholarly journals Archaeology in Greece, 1899–1900

1900 ◽  
Vol 20 ◽  
pp. 167-181 ◽  
Author(s):  
R. C. Bosanquet
Keyword(s):  
Honorary Member ◽  
The Past ◽  
The North ◽  
North Side ◽  
British School ◽  
Practical Usefulness ◽  
The Press ◽  
French School ◽  
History Of ◽  
Special Meeting

It is satisfactory to be able to begin this report by announcing important additions to the equipment of three of the Athenian Schools. The German Institute was able to inaugurate its spacious new library at a special meeting held on March 12 to celebrate the completion of its twenty-fifth year. The British School has received from Mr. W. H. Cooke, nephew and joint-heir of the late George Finlay, the library of some 5,000 volumes, together with the bookshelves and antiquities, which had remained untouched in the historian's house in the ῾Οδὸς ῾Αδριανοῦ since his death in 1875. And M. Homolle is drawing up the plans for an annexe which will enable the French School to extend its hospitality to students from Belgium, Russia and other countries which have no archaeological headquarters in Athens.The excavations on the north side of the Acropolis have been suspended. The Archaeological Society is spending large sums each year upon the repairs to the Parthenon, and is also buying up houses, when opportunities occur, with a view to continuing the excavations on the site of the ancient Agora. One great undertaking, upon which the Society has been engaged at intervals for upwards of forty years, has been brought to a successful conclusion. The Stoa of Attalos is now completely cleared and from being one of the most bewildering it has become one of the most intelligible of Athenian monuments. Great credit is due to Mr. Mylonas, who has been in charge of the work for the last two years. The Archaeological Society has recently published a first instalment of the late Dr. Lolling's Catalogue of Inscriptions, and a volume on Epidaurus by Dr. Kavvadias. These are to be followed at intervals by other archaeological books. The third, which is in the press, is a history of the doings of the Society from its foundation to the year 1900. Its income and practical usefulness have increased immensely during the past five years. The Society has recently lost one of its best-known members in Stephanos Kumauudes, who was for thirty-six years its secretary and for many years keeper of its antiquities, now merged in the national museum. He was an honorary member of the Society for the Promotion of Hellenic Studies, and author of a well-known volume of sepulchral inscriptions.

Landsliding caused by Pleistocene glacial lake ponding–an example from central British Columbia

1987 ◽  
Vol 24 (4) ◽  
pp. 656-663 ◽  
Author(s):  
N. Eyles ◽  
John J. Clague
Keyword(s):  
British Columbia ◽  
Debris Flows ◽  
Large Scale ◽  
Slope Failure ◽  
Glacial Lake ◽  
Fraser River ◽  
Stability Of Slopes ◽  
History Of ◽  
The Stability ◽  
Glacier Advance

Sections cut through the Quaternary sediment fill of the Fraser River valley in central British Columbia provide evidence for large-scale landsliding during Pleistocene time. Especially notable are thick, laterally extensive diamict beds, consisting mainly of Tertiary rock debris, that occur near the base of glaciolacustrine sequences. These beds were deposited by subaqueous debris flows during one or more periods of lake ponding when advancing Pleistocene glaciers blocked the ancestral Fraser River. The association of diamict beds and glaciolacustrine sediments deposited during periods of glacier advance may indicate a genetic link between slope failure and lake filling. These observations (1) demonstrate the adverse effects of high pore pressures on the stability of slopes underlain by poorly indurated Tertiary rocks and (2) extend the known history of landslides involving these rocks back into the Pleistocene. Key words: landslides, debris flows, Pleistocene, glacial lake.

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