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TitleReport on the surficial geology of upper Chaleur Bay, mapped using MS26B echosounder data from the Canadian Hydrographic Service
AuthorKoppen, L; Geomarine Associates Ltd.
SourceGeological Survey of Canada, Open File 1327, 1986, 45 pages (1 sheet),
PublisherGeological Survey of Canada
Documentopen file
MapsPublication contains 1 map
Map Info.surficial geology, marine sediments, submerged features, 1:50,000
Mediapaper; on-line; digital
File formatpdf
ProvinceNew Brunswick; Eastern offshore region
NTS21O/16; 22B/01
AreaChaleur Bay
Lat/Long WENS -66.5000 -66.0000 48.1667 47.9167
Subjectssurficial geology/geomorphology; marine geology; marine sediments; silts; muds; sands; coastal studies; sedimentation; sediment transport; channels; geophysical surveys; acoustic surveys, marine; echo sounding; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; tables; figures; profiles
Precision Document Management
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Geological Survey of Canada (Atlantic)
Natural Resources Canada Library - Ottawa (Earth Sciences)
Natural Resources Canada library - Vancouver (Earth Sciences)
Natural Resources Canada library - Calgary (Earth Sciences)
Released1986 09 01; 2017 06 30
Surficial sediment texture has been mapped in the Upper Bay of Chaleur using MS26B echosounder data collected by the Canadian Hydrographic Service in 1964. Four types of bottom sediment , I, II, IIa and III, interpreted as sandy silt, mud, sandy mud and sand, are distinguished on the basis of reflector characteristics. Sediment is generally distributed with the coarsest material in shallow water and the finer material deposited in deeper areas.
A submerged and partially buried river channel has been traced from the mouth of the Restigouche River eastward to the margin of the map area. Apparent scouring indicates strong bottom currents in the section of channel between profiles El-E2 and Jl-J2. Sediment distribution also indicates stronger bottom currents north of the channel than to the south. Thus, areas favourable for dumping of dredged material would be southwest of the channel, over Type IIa sediment, or in the eastern portion of the map area, over Type II sediment.