Reply to the discussion by N. Eyles and A. Mohajer on "Analysis and reinterpretation of deformation features in the Rouge River valley, Scarborough, Ontario"

2003 ◽  
Vol 40 (9) ◽  
pp. 1303-1305 ◽  
Author(s):  
Laurent Godin ◽  
Richard L Brown ◽  
Aleksis Dreimanis ◽  
Gail M Atkinson ◽  
Derek K Armstrong
Keyword(s):  
River Valley ◽  
Deformation Features ◽  
Rouge River

Discussion of "Analysis and reinterpretation of deformation features in the Rouge River valley, Scarborough, Ontario"

2003 ◽  
Vol 40 (9) ◽  
pp. 1299-1301 ◽  
Author(s):  
N Eyles ◽  
A Mohajer
Keyword(s):  
River Valley ◽  
Deformation Features ◽  
Rouge River

Analysis and reinterpretation of deformation features in the Rouge River valley, Scarborough, Ontario

2002 ◽  
Vol 39 (9) ◽  
pp. 1373-1391 ◽  
Author(s):  
Laurent Godin ◽  
Richard L Brown ◽  
Aleksis Dreimanis ◽  
Gail M Atkinson ◽  
Derek K Armstrong
Keyword(s):  
Flow Direction ◽  
Normal Fault ◽  
River Valley ◽  
Local Perturbation ◽  
Ice Flow ◽  
Extensive Data ◽  
Deformation Features ◽  
Flow Directions ◽  
Rouge River ◽  
Multiple Episodes

Geometry and timing of deformation affecting Ordovician bedrock and overlying Pleistocene sediments in the Rouge River valley near Scarborough, Ontario, are analysed to evaluate whether or not the structures are a result of glacial action or neotectonic activity. Extensive data on local and regional ice-flow directions are used to evaluate the kinematic compatibility between the observed faults and folds and the local ice-flow directions. Jointing and multiple episodes of faulting affect both the Ordovician bedrock and the overlying Pleistocene sediments. At one site, the bedrock is displaced by a normal fault by a minimum of 1.2 m. Crosscutting relationships constrain the majority of the faulting in the Rouge River valley as being coeval with deposition of the lower Bowmanville till during the Nissouri phase (ca. 23–15 ka), and possibly younger at one locality. The youngest regional ice-flow direction is northwestward; however, local ice-flow directions are highly variable. This can be explained by local perturbation enhanced by the presence of drumlinoid features in the area. Most deformation features are compatible with local and regional ice-flow directions. Glaciotectonic ice-push and ice-thrust deformation affected the Thorncliffe Formation after about 23 ka. Although some faults appear to be kinematically incompatible with ice-flow directions, six boreholes drilled to 52 m depth revealed only minor vertical offsets of bedrock strata in the uppermost 20 m, and an absence of obvious fault offsets deeper, precluding the possibility that the faults observed in the surface exposures were caused by deep-seated neotectonic stresses.

scholarly journals Late quaternary faulting in the Rouge River Valley, southern Ontario: seismotectonic or glaciotectonic?

1993 ◽  
Author(s):  
J Adams ◽  
L Dredge ◽  
C Fenton ◽  
D R Grant ◽  
W W Shilts
Keyword(s):  
Late Quaternary ◽  
River Valley ◽  
Southern Ontario ◽  
Rouge River

scholarly journals Cultural landscapes of the Rouge River Valley, Québec

1969 ◽  
Vol 13 (28) ◽  
pp. 77 ◽  
Author(s):  
Pauline Frost
Keyword(s):  
Cultural Landscapes ◽  
River Valley ◽  
Rouge River

CIRCLING BACK: CHRONICLE OF A TEXAS RIVER VALLEY

1997 ◽  
Vol 16 (1) ◽  
pp. 133-134
Author(s):  
Joanne M. Westphal
Keyword(s):  
River Valley

Globally endangered butterflies (Lepidoptera) protected in the natural reserve «Dniprovsko-Orilsky»

2016 ◽  
Vol 27 (3-4) ◽  
pp. 47-54
Author(s):  
K. K. Holoborodko ◽  
V. O. Makhina ◽  
K. S. Buchnieva ◽  
O. E. Pakhomov
Keyword(s):  
Rare Species ◽  
Geographical Location ◽  
Taxonomic Diversity ◽  
Red List ◽  
River Valley ◽  
Number Of Species ◽  
Natural Reserve ◽  
Western Palearctic ◽  
Mediterranean Origin ◽  
Northern Species

Floodplain valley of the Dnieper river midstream is a unique natural complex, having a great bìogeographical, ecological, environmental, historical and recreational values. In 1990, the Natural reserve «Dniprovsko-Orilsky» was established within the area. The Natural reserve «Dniprovsko-Orilsky» is environmentally protected site within the Dnipropetrovsk region, Dnipropetrovsk oblast, Ukraine. This reserve occupies part of the Dnieper river valley and marshy and reedy banks of Protovch river (existing bed of Oril river). It was created by Regulation of the Council of Ministers of the USSR of 15 September 1990, No. 262, based on common zoological and ornitological Nature reserves «Taromskì plavni» and «Obukhovskie zaplavy». On the territory of the Natural reserve «Dniprovsko-Orilsky», they were registered 32 Lepidoptera species listed in the List of Threatened Species at different categories (5 species in IUCN Red List ; 18 in Red Data Book of Ukraine; 7 in European Red List of plants and animals endangered on a global scale; 31 in Red Book of Dnipropetrovsk oblast). The main scientific materials were author’s collections from area of research and materials of entomological funds, Department of Zoology and Ecology, Oles Honchar Dnipropetrovsk National University (mostly Memorial Collection of V. O. Barsov). Field surveys covered all the ecosystems basic on size and degree of protection. The author’s researches have conducted over the past decade during annual expeditions to the Reserve. Taxonomic structure of the complex is quite diverse, and represented by all the major families of higher millers and rhopalocera, having protectedstatus. In relation to taxonomy, this complex formed by representatives of five superfamilies (Zyganoidea, Noctuoidea, Bombycoidea, Hesperioidea, Papilionoidea) from 11 families (Zygaenidae, Saturniidae, Sphingidae, Noctuidae Arctiidae Hesperiidae, Papilionidae, Pieridae, Nymphalidae, Satyridae, Lycaenidae). High taxonomic diversity can be explained by unique geographical location of the reserve in azonal conditions of the Dnieper river valley. Such location allows to enter different zoogeographic Lepidoptera groups on the reserve territory. Zoogeographic analysis of species protected within the reserve territory selected 7 basic groups. It was found that most of the globally rare species have Mediterranean origin (39 %); species of Palearctic origin are in second place (22 %); Western Palearctic and Ponto-Kazakh types of areas are same of number of species, and come third (11 %); and others come 17 % (European, Euro-Siberian, and Holarctic). This fauna component is specific due to presence of so-called «northern» species that make up 40 % (representatives of Palearctic, Western Palearctic, Euro-Siberian, European and Holarctic groups). Their existence within the reserve territory is only possible due to development of boreal valley ecosystems. High taxonomic diversity can be explained by unique geographical location of the reserve in azonal conditions of the Dnieper river valley. Such location allows to enter different zoogeographic Lepidoptera groups on the reserve territory. Zoogeographic analysis of species protected within the reserve territory selected 7 basic groups. It was found that most of the globally rare species have Mediterranean origin (39 %); species of Palearctic origin are in second place (22 %); Western Palearctic and Ponto-Kazakh types of areas are same of number of species, and come third (11 %); and others come 17 % (European, Euro-Siberian, and Holarctic). This fauna component is specific due to presence of so-called «northern» species that make up 40 % (representatives of Palearctic, Western Palearctic, Euro-Siberian, European and Holarctic groups). Their existence within the reserve territory is only possible due to development of boreal valley ecosystems.

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