GEOLOGICAL SURVEY OF CANADA COMMISSION GEOLOGIQUE DU CANADA CURRENT RESEARCH PART C RECHERCHES EN COURS PARTIE C Ttb Geological Survey's thrice-yearly Cwent Ressarchmriea contains many reports comparable In amps and abject matter to tho- appearing in acientiflc Journal8 md other &riala All contrlbutlm to the Scientific and Technical Report mctlon of Clo7snt Remhlncluds an abatract end bibliographic citetion. It ir hDpsd thet thew will amiat you In cataloguing and Indexing them reports and that this will rerult in a still wlder diswmlnetion of the rswlts of the Geological Survey's rewarch octivltie~. La adrfe Recherchea en wrsde la Commkdm gddoglque parail tmfa fofa par mk: die contlmt plwioura mppma dont la portde et la nature wnt comparable L cew quf paralswnt drmd Ira revues acientfffquua rt cutre8 pdrtodfquea. Tau lea artfclea prblfda dam la mctfcm dea mppwta aclentfftquea et techlques de la pblfcatlm Rechsrchsr en coum mt accompqda dhr6aurnd et dbe bfblfographie, ce qui vow prrmettm, nau lle~rona,de catalogper et d'bwlcrxer cea rapports, dl& une meflleure difblon ks rdarltata de recherche de la Commf8aion gdologlque. Tednlml sdltlng dawnplhtim Rmductkndt Typed rd dacked RW.cum*tconpnotbntwch@lw -.tm 2. mpqp mn&icattm R.G Bleckeder Leona R. Mahoney Debby B~Y P.J. Grlffln Lome A. Firth Judy Cot6 H. Dumych Mleheel J. Kiel Sharon Pamhem E.R.W. kale Swan Gagrnm Cathy Bell Jam Deaautelr GEOLOGICAL SURVEY PAPER 79-1 C COMMISSION GEOLOGIQUE ETUDE 79-1 C CURRENT RESEARCH PART C RECHERCHES EM COURS PARTIE C ERRATUM Current ResearchfRecherches en cours, PaperlCtude 79-1 B Page 4 16 Theoretical aspects of alpha coefficients used in X-ray fluorescence analysis; G.R. Lachance, The two equations were incorrectly printed. The correct forms follow. 1. Wi = Ri (1 + W.'Y..' . + WjWkaijk) 1 11 is a function of 'Y.. + Wm(aimj + W: aimmj) where 'I i = analyte element j = matrix element, absorption or enhancement W = weight fraction R = relative intensity to pure i m = matrix elements j, k, . aijk= a "crossed effect" coefficient where Z = atomic number n = exponent = 2.6 u = ciashould read u = cia SCIENTIFIC AND TECHNICAL REPORTS RAPPORTS SCIENTIFIQUES ET TECHNIQUES Page W.B. COKER and W.W. SHILTS: Lacustrine geochemistry around the north shore of Lake Superior: Implications for evaluation of the effects of acid precipitation .......... 1 R. J. FULTON and D. A. HODGSON: Wisconsin glacial retreat, southern Labrador. .... 17 L.A. DREDGE and F.M. NIXON: Thermal sensitivity and the development of tundra ponds and thermokarst lakes in the Manitoba portion of the Hudson Bay Lowland.. .. 23 L.A. DREDGE: Thaw depths and permafrost in polygonal peat terrain, Hudson Bay Lowland, Manitoba... ............................................... 27 E.L. ZODROW and MARCOS ZENTILLI: Uranium content of rocks, coal, and associated minerals from the Sydney Coalfield, Cape Breton Island, Nova Scotia .... 31 J .C. CONWAY, K .V. ALLEN, Y .B. BLANCHARD, Q. BRISTOW, W.G. HYATT, and P.G. KILLEEN: The effects of borehole diameter, borehole fluid, and casing thickness on gamma ray logs in large diameter boreholes .......................... 37 J-M. SEMPELS and PATRICK McLAREN: Basic computer programs for the Positioning, recording, and display of spatially distributed data ................... 41 R.S. TIPNIS: Fused clusters of Ptiloncodus simplex Harris; an Ordovician phosphatic microfossil ......................................................... 51 Q. BRISTOW: A gamma ray spectrometry system for airborne geological research .... 55 HANS FREBOLD: Occurrence of the Upper Bathonian ammonite genus Iniskinites in the Queen Charlotte Islands, British Columbia ................................ 63 R.K. PICKERILL, G.E. PAJARI, and K.L. CURRIE: Evidence of Caradocian glaciation in the Davidsville Group of northeastern Newfoundland.. ................ 67 S.M. BLASCO, B.D. BORNHOLD, and C.F.M. LEWIS: Preliminary results of surficial geology and geomorphology studies of the Lomonosov Ridge, Central Arctic Basin... ........................................................ 73 JAMES DIXON and L. R. SNOWDON: Geology and organic geochemistry of the Dome Hunt Nektoralik K-59 well, Beaufort Sea. ................................. 85 T.G. POWELL: Geochemistry of Snorri and Gudrid condensates, Labrador Shelf; Implications for future exploration .............................................. 9 1 SCIENTIFIC AND TECHNICAL NOTES NOTES SCIENTIFIQUES ET TECHNIQUES Page A.C. ROBERTS, A.G. PLANT, and M. BONARDI: Duranusite from the Mount Washington Copper Deposit, Comox District, Vancouver Island, British Columbia ............................................................ 97 A.C. ROBERTS: Paralstonite: A new mineral from the Minerva no. 1 Mine, Cave-in-Rock, Illinois .......................................................... 99 J.A. HUNTER, R.A. BURNS, R.L. GOOD, and T.E. HARRISON: Seabottom seismic refraction array designs ......................................................... 101 D.K. NORRIS: A new mineral occurrence of unknown economic potential in northern Yukon Territory ........................................................ 103 W. BLAKE, Jr: Age determinations on marine and terrestrial materials of Holocene age, southern Ellesmere Island, Arctic Archipelago ...................... 105 C. 3. PRINGLE: Electron microprobe analysis of a seleniferous bismuth sulphosalt: Correlations for matrix effects .................................................. 11 I DISCUSSIONS AND COMMUNICATIONS DISCUSSIONS ET COMMUNICATIONS PAUL RAMAEKERS:. The paleolatitude and paleomagnetic age of the Athabasca Formation, northern Saskatchewan - Discussion ................................... 117 W .F. FAHRIG, K. W. CHRISTIE and G. FREDA: The paleolatitude and paleomagnetic age of the Athabasca Formation, northern Saskatchewan - Reply ................... 119 W.C. GUSSOW: Mount Goodsir, British Columbia and Alberta - Discussion ............. 121 R.A. PRICE and E. W. MOUNTJOY: Mount Goodsir, British Columbia and Alberta - Reply ........................................................... 122 RAYMOND GOLDIE: Metamorphic history of the Archean Abitibi Belt - Discussion .... 125 Author Index ...................................................................... 127 Note To Contributors Submissions to lhe Discussion section of Current Research are welcome from bolh the staff of the Geological Survey and from lhe public. Discussions are limited lo 6 double-spaced typewritten pages (about 1500 words) and are subject to review by the Chief Scienlific Editor. Discussions are reslricted Lo the scientific conlent of Geological Survey reports. General discussions concerning branch or government policy will no1 be accepted. Illustrations will be accepted only if, in Lhe opinion of the edilor, they are considered essential. In any case no redrafting will be undertaken and reproducible copy musl accompany the original submissions. Discussion is limiled to recent reports (not more than 2 years old) and may be in either English or French. Every effort is made lo include bolh Discussion and Reply in the same issue. Current Research is published in January, June and November. Submissions for Lhese issues should be received nol: later than November 1, April 1, and September 1 respeclively. 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The addresses of Lhe Geological Survey of Canada offices follow: 601 BooLh SLreeL, OTTAWA, OnLario K1A OE8 Institute of Sedimentary and Pelroleurn Geology, 3303-33rd Street N.W., CALGARY, Alberta T2L 2A7 British Columbia Office, 100 West. Pender Streel, VANCOUVER, B.C. V6B 1R8 Atlantic Geoscience Cenlre, Bedford InsLitule of Oceanography, P.O. Box 1006, DARTMOUTH, N.S. B2Y 4A2 When no location accompanies an author's name in Lhe Litle of a paper, the OLLawa address should be used. TirO h part On peut obtenir un nombre lirnite' de I1tir6s 13 part" des articles