scholarly journals Hudson 2010020 expedition: a geological and geophysical survey for geohazard assessment on Grand Banks, Newfoundland and Labrador

2011 ◽  
Author(s):  
M Z Li ◽  
E L King ◽  
O Brown ◽  
G Cameron ◽  
P Fraser ◽  
...  
Keyword(s):  
Newfoundland And Labrador ◽  
Geophysical Survey ◽  
Grand Banks ◽  
Geohazard Assessment

Paleocontinental slopes of East Coast Geosyncline (Canadian Atlantic margin)

1977 ◽  
Vol 14 (11) ◽  
pp. 2553-2564 ◽  
Author(s):  
Lewis H. King ◽  
Ian F. Young
Keyword(s):  
Newfoundland And Labrador ◽  
East Coast ◽  
Shelf Edge ◽  
Mass Wasting ◽  
Scotian Shelf ◽  
Grand Banks ◽  
Shelf Slope ◽  
Seismic Reflection Profiles ◽  
Atlantic Margin ◽  
Upper Slope

A study of processed seismic reflection profiles along the eastern Canadian continental margin indicates the occurrence at depth of paleocontinental slopes of Cenozoic–Mesozoic age, generally in the vicinity of the present continental slope. The paleoslopes are of two general types, constructional and destructional, formed respectively by progradational processes and mass wasting. The inclined beds of the progradational sequence (clinoform beds) represent the constructional slopes and were probably formed at times when deposition was simultaneous on the shelf, slope, and rise. Conditions leading to the establishment of a relatively deep shelf edge would favor constructional slope formation and preservation. A relatively shallow shelf edge, common during times of low sea level, would promote cutback at the shelf edge and upper slope and lead to the formation of destructional slopes. The depth of the shelf edge is mainly established by the balance between rates of sedimentation and subsidence in conjunction with the processes arising from variations in sea level.The sequence of constructional and destructional paleocontinental slopes varies widely along the Canadian Atlantic margin. On the western Scotian Shelf adjacent to the LaHave Platform the paleoslopes are mainly destructional and are in proximity, with only fragmental expression of former constructional slopes remaining. On the eastern Scotian Shelf and Grand Banks destructional paleoslopes are widely spaced in section between thick areas of constructional slope development. Paleoslopes along the northeast Newfoundland and Labrador Shelves are mainly constructional. The differences may be related to age of opening of the Atlantic Basin.The type and distribution of paleocontinental slopes along a margin could influence the migration of hydrocarbons from the eugeocline to the miogeocline.

Freshwater leech (Annelida: Hirudinida) distribution in the Canadian Province of Newfoundland and Labrador and adjacent regions: check-list, new records, new pigmentation forms, and Pleistocene refugia

Zootaxa ◽  
2007 ◽  
Vol 1657 (1) ◽  
pp. 1-21 ◽  
Author(s):  
JACQUELINE MADILL ◽  
PETER HOVINGH
Keyword(s):  
United States ◽  
Natural History ◽  
Newfoundland And Labrador ◽  
New Records ◽  
The United States ◽  
The Other ◽  
National Museum ◽  
Check List ◽  
Canadian Province ◽  
Grand Banks

The freshwater leeches (Hirudinida) in the Province of Newfoundland and Labrador were investigated by examining theliterature, the Canadian Museum of Nature and the United States National Museum of Natural History records, and aleech survey. New pigmentation forms are described for Erpobdella punctata (Leidy) and Erpobdella obscura (Verrill).This is the first published record for Haemopis lateromaculata Mathers in Canada. Four species (Glossiphonia elegans(Verrill), Helobdella modesta (Verrill), Erpobdella punctata, and Erpobdella obscura) were found in both Labrador andNewfoundland with Erpobdella obscura common in Labrador and the other three species common in Newfoundland.Seven other species of leeches were less abundant in Newfoundland with 6 of these species very restricted in distribution.The abundance of leech species in Newfoundland and the paucity of leech species in Labrador suggested that theisland species were present in a Pleistocene refugium associated with Newfoundland or the Grand Banks. Post-Pleistocenebarriers to leech mobility are examined, and possible timing of colonization events is proposed in this model.

scholarly journals Bottom-up limits to Newfoundland capelin (Mallotus villosus) rebuilding: the euphausiid hypothesis

2013 ◽  
Vol 71 (4) ◽  
pp. 775-783 ◽  
Author(s):  
Shannon G. Obradovich ◽  
Erin H. Carruthers ◽  
George A. Rose
Keyword(s):  
Newfoundland And Labrador ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Mallotus Villosus ◽  
Bottom Up ◽  
Grand Banks ◽  
Capelin Mallotus Villosus ◽  
Dietary Component ◽  
Δ 15N ◽  
Δ15n And Δ13c

Abstract Capelin (Mallotus villosus) is the key forage fish species in the Newfoundland and Labrador Shelf ecosystem. Capelin stocks collapsed in the early 1990s, concurrent with declines in “northern” Atlantic cod, Gadus morhua. Neither has fully recovered yet. Changes in growth, condition, and behaviour accompanied capelin declines on the northern Grand Banks (NGB), and remain two decades later. Feeding, growth, and condition of NGB capelin were all lower when compared with capelin from the eastern Scotian Shelf (ESS), where abundance increased following predator declines. For age 2–5 capelin of both sexes, all but one of five comparable age–sex groups were significantly larger on the ESS (e.g. age 3 females average 169 mm on the ESS and 151 mm on the NGB). Neither temperature nor density-dependence explain these differences. However, dietary differences were prominent. ESS capelin had higher total fullness indices (TFIs) than NGB fish at all sizes [mean TFIESS = 1.43 (± 1.14), mean TFINGB = 0.48 (± 0.70)]. Euphausiids (especially Thysanoessa spp.) were a main dietary component on the ESS but not on the NGB. Stable isotope analyses (δ15N and δ13C) for NGB capelin also indicated few dietary euphausiids. Trophic fractionation of δ 15N was 4.740/00, suggesting NGB capelin were food limited. Capelin recovery on the Newfoundland and Labrador Shelf appears limited by bottom-up forcing, in particular lack of euphausiid prey.

The Makrakomi Archaeological Landscapes Project. A preliminary report on investigations carried out in 2010–2012

2013 ◽  
Vol 6 ◽  
pp. 211-260 ◽  
Author(s):  
Maria-Foteini Papakonstantinou ◽  
Arto Penttinen ◽  
Gregory N. Tsokas ◽  
Panagiotis I. Tsourlos ◽  
Alexandros Stampolidis ◽  
...  
Keyword(s):  
Preliminary Report ◽  
Geophysical Survey ◽  
Small Scale ◽  
Hellenistic Period ◽  
Surface Survey ◽  
Multiple Structures ◽  
Recorded Data ◽  
Architectural Survey ◽  
The Hill ◽  
The Town

In this article we provide a preliminary report of the work carried out between 2010 and 2012 as part of the Makrakomi Archaeological Landscapes Project (MALP). The programme of research is carried out in co-operation between the Swedish Institute at Athens and the 14th Ephorate of Prehistoric and Classical Antiquities at Lamia. The interdisciplinary project started in the summer of 2010, when a pilot survey was conducted in and around the hill of Profitis Elias, in the modern municipality of Makrakomi, where extensive traces of ancient fortifications are still visible. Systematic investigations have been conducted since 2011 as part of a five-year plan of research involving surface survey, geophysical survey and small-scale archaeological excavation as well as geomorphological investigation. The primary aim of MALP is to examine the archaeology and geomorphology of the western Spercheios Valley, within the modern municipality of Makrakomi in order to achieve a better understanding of antiquity in the region, which has previously received scant scholarly attention. Through the archaeological surface survey and architectural survey in 2011 and 2012 we have been able to record traces of what can be termed as a nucleated and structured settlement in an area known locally as Asteria, which is formed by the projecting ridges to the east of Profitis Elias. The surface scatters recorded in this area suggest that the town was primarily occupied from the late 4th century BC and throughout the Hellenistic period. The geophysical survey conducted between 2011 and 2012 similarly recorded data which point to the presence of multiple structures according to a regular grid system. The excavation carried out in the central part of Asteria also uncovered remains of a single domestic structure (Building A) which seems to have been in use during the Late Classical and Hellenistic periods. The combined data acquired through the programme of research is thus highly encouraging, and has effectively demonstrated the importance of systematic archaeological research in this understudied area of Central Greece.

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