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Depth to bedrock was determined over part of the Precambrian Holyrood granite in the Seal Cove River valley, Avalon Peninsula, Newfoundland, using both electromagnetic and refraction hammer seismic methods. These geophysical interpretations, based on an assumed two-layer geometry, were compared with direct probe and drilling records of depth to bedrock. Combined data show that the cover sequence (glacial drift and peat bog) ranges from zero to eight meters in thickness, and overlies subhorizontal glaciated granite. The buried granite surface dips gently northwards, down valley, and Includes isolated hummocks and hollows, which are interpreted to be buried roche mountonnee and ice-plucked depressions. Granite resistivity and congressional wave velocity minima coincide, and are thought to indicate areas of dense meaoscopic fracturing in the granite. Seismic depths are within 0.2 m of true depth where thicknesses are less than one meter, and are generally accurate to 101 elsewhere. EM depths are subject to uncertainties of u[j[»er layer resistivity values, and problems caused by power line interference, but. by cross-calibration with other methods, are within 0-28 m of true depth In the one meter range, even In saturated peat bog, and within 0.86 m where thicknesses are approximately seven meters.   RESUME  On a determine la profondeur du socle sur une partie du granite precambrien d'Holyrood, dans lavallee de la riviere Seal Cove, grâce aux methodes electromagnetlques et de sismique refraction par marteau. On a base ces interpretations geophysiques sur un module a deux couches, puis on lea a comparers aux Bondages directs et aux donnees de forage eur la profondeur du socle. Ces donnees combinees demontrent que le mort-terraln (moraine et tourbiere) a une epaisseur de zero a huit metres et recouvre un granite legereraent incline ayant subi l’ablation glaciaire. La surface enfouie du granite plonge faiblement vers le nord, en aval, et comprend des_mamelonse et des creux isoles que l'on interprete comme etant des roches moutonnees et des orobilies enterres. La resistivite et les minimums de vitesse d'onde de compression coincident et indiquent, on le croit, des zones de fracturation mesoscopique dense dans le granite. La ou l’epaisseur est moins d'un metre, les profondeurs sismiques s'approchent a moins de 0.2 m des vrales profondeurs. Ailleurs, leur exactitude est generalement de 101. Les profondeurs determinees par l'electromagnetisme sont sujettes aux incertitudea dans la valeur de la resistivite de la couche superieure ainai qu'aux problemes causes par l’interference des lignes a haute-tension. Par contxe, une interpretation combines a permis de s'approcher a 0.28 m de la profondeur reelle lorsqu'elle est d'envlron un metre, meme dans les tourbieres saturees. et a 0-86 in la ou l’epaisseur du mort-terraln est d'envlron sept metres.  [Traduit par le journal]

Depth of bedrock in the Seal Cove river valley, Newfoundland: a geophysical case study