Two new publications: Open File 2010-08 and GeoFile 2010-13

Surficial Geology of the Komie Creek Area (NTS 094P/05)

T.E. Demchuk

Open File 2010-08

The Komie Creek map area was fully glaciated by the Laurentide Ice Sheet (LIS) during the Late Wisconsinan Fraser Glaciation. Ice flow during the glacial maximum was towards the southwest, as indicated by the orientation of streamlined landforms on the Etsho Plateau. At some time after the Fraser Glaciation maximum, the LIS divided into two lobes (upland and lowland). The subsequent landform assemblages, highlighted well in LiDAR imagery, provide evidence that the upland lobe retreated to the northeast and the lateral margin of the lowland lobe dropped to the southwest.

Organic deposits are the dominant surficial material type in the Komie Creek map area. They have accumulated and been deposited on poorly drained clay and silt-rich morainal and glacio-lacustrine deposits. Morainal deposits are the next most common surficial material type in the area and dominate along the top of the Etsho Escarpment and in the northeast corner of the study area. Glaciofluvial deposits are rare.

During ice retreat, an ice-marginal lake formed in the south-central part of the study area where the lowland lobe prevented drainage of meltwater out of the area. An aerially extensive landform, interpreted as an ice-contact glaciofluvial delta complex, was deposited into this dynamic glacial lake. The lake levels rose abruptly several times during delta deposition as a result of large west-flowing outburst floods in the Cabin Creek melt water channel, generated when a glacial lake breached its margins on or under the upland lobe. The delta is composed of several lobate landforms that sedimentologically are highly variable.

A new, detailed 1:50,000-scale surficial geology map for the Komie Creek map area is presented in this Open File. This map was generated using aerial photographs, LiDAR DEMs, ground-based geophysics and field observations.


Unprocessed ground penetrating radar for the Komie North glaciofluvial delta, northeast British Columbia (NTS 094P/05)

T.E. Demchuk

GeoFile 2010-13

Geofile 2010-13 provides unprocessed ground penetrating radar (GPR) data collected during field studies at the Komie North glaciofluvial delta in northeastern British Columbia. The data was collected as part of a research project investigating the genesis of the glaciofluvial delta. This work was also part of the northeast BC Aggregate Program of the Ministry of Energy, Mines and Petroleum Resources. Further information about this area, including surficial geology and sedimentology, are presented by Demchuk (2010). The data presented here include JPEGs of unprocessed GPR data and raw data files for processing.

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September 16, 2010