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Stratigraphic Trends in the Gething Formation

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Stratigraphic Trends in the Gething Formation Province of British Columbia ~’ MINERAL RESOURCES DIVISION Ministry of Energy, Mines and Geological Survey Branch Petroleum Resources STRATIGRAPHIC TRENDS IN THE GETHING FORMATION By A. Legun A Contribution to the Canada/British Columbia Mineral Development Agreement, 1985-1990 OPENFILE1990-33 Canadian Cataloging in Publication Data Legu”, Andrew s., 1949- Stratigraphic trends in the Gething Formation (Open file, ISSN 08353530 ; 1990-33) “A contribution to the Canada/British Columbia Mineral Devc,om”ent Am’eement, 19X5-1990.” VICTORIA BRITISH COLUMBIA CANADA 1. &thing Formation (B.C.) 2. Coal - Geology British Columbia - Peace River (Regional district) 3. Geology, March 1991 Stratigraphic. 4. Geology, Economic-British Columbia - l’eace River (Regional district) I. British Columbia. Geological Survey Branch. II. Canada/British Columbia Mineral Devclopmcnt Agreement. III. Title. IV. Series: yg3;f’ (British Columbia. Geological Survey Branch) ; QE187.443 1991 553.2’4’0971187 c91-092142-3 TABLE OF CONTENTS Page INTROD.UC’I’ION.. ..........................................1 General .........................................................1 Acknowledgments....................................... 1 GEOLOGY.. ......................................................3 Stratigraphic Trends.................................... 4 Chamberlain Member.. ........................4 Bullmoose Member ..............................7 Gaylard Member.. .................................7 Sourcesof Data.. ...................................8 SELECTED BIBLIOGRAPHY.. ...................9 APPENDIX l................................................... 11 Gething Database Notes.. ........................ 11 FIGURES 1. Location map of study area.. ....................... 1 2. Surface extent of Moosebar and Gething Formations ....................................(in pocket) 3. Schematicsection of Bluesky unit.. ............4 4. Stratigraphic trends in the Gething Formation.. ...................................(in pocket) 5. Coal facies in the Chamberlain member ... 5 6. Stratigraphic interpretation.. .......................6 7. Section through the Gething Formation .. .7 TABLE 1. Table of Formations . .. .. .. .. .. .. 3 Open Fik 19!AS33 Y vi Geo/ogica/ Sumy Bmnch INTRODUCTION GENERAL cideswith the surface exposure of the Gething This project provides a stratigraphic and Moosebar Formations within the framework for interpreting of the geology of Foothills,‘as illustrated by Figure 2, which is the Gething Formation in the southern portion based onmapping by Kilby er al., (1989). Fig- of the northeast British Columbia coalfield ure 2 also illustrates the distribution of the which lies between the Sukunka River and stratigraphic data used in the study. Kinuseo Creek. The study area is covered by ACKNOWLEDGMENTS NTS map sheets93P/l to 8 and 931/14 and 15, but focuses on a slightly smaller area that ex- I am grateful for financial support under cludes 93P/l, 7 and 8 (Figure 1). The study the Canada/British Columbia Mineral integrates data from the Plains,largely from oil Development Agreement 1985-1990. This and gas wells, with Foothills data from coal stratigraphic compilation project was exploration work. The area potentially under- facilitated by input and assistancefrom various lain by economic coal measuresroughly coin- sources. Thanks go to Candace Kenyon for Figure 1. Location map of study area. Open File 1990.33 1 initial plots of data from COALFILE, to Ward the Gething Formation. Dave Johnson of Kilby for familiarization with databases and Quintette Coal Ltd. kindly provided current computer plots and to Dave Johnson of the stratigraphic data for the Gething Formation Petroleum Engineering and Operations in the Quintette mine area. George Walker Branch at Charlie Lake for accessto petroleum ably assistedme in the field. I am indebted to well data. David Hughes kindly provided the the patience of Pierino Chicorelli who Geological Survey of Canada Sukunka draughted the figures. Last but not least thanks databasecompiled by Caleen Kilby. Dave Gib- to Vie Preto, Manager of District Geology for son of the Geological Survey of Canada an open handed approach to the execution of clarified aspectsof stratigraphic subdivisionof this project. 2 Geobgical Surwy Bmnch GEOLOGY The coal-bearing Lower Cretaceous Geth- fauna. Also known as the Gething marine ing Formation is overlain by Moosebar Forma- tongue, it separates the upper and lower coal tion marine shales and underlain by measures.Gibson revised this subdivision and conglomeratic sandstonesof the CadominFor- formally define three new units: the Chamber- mation. lain, Bullmoose and Gaylard members. The basic lithologic sequencein the Geth- Gibson’s subdivision is utilized in this report. ing Formation is shown in Table 1 together with The principal changefrom Duff and Gilchrist’s a comparison of the stratigraphic terminology subdivision has been to split the Middle Geth- used by Gibson (1987), Duff and Gilchrist ing. The thick sandstone of the upper half of (1983), Oppelt (1986) and Williams (1984). the coarsening-upward sequence is now the Duff and Gilchrist informally divided the basal sandstone of the Chamberlain member Gething Formation into three units: the upper, and the shalebelow constitutes the Bullmoose middle and lower Gething. The middle Geth- member; the Lower Gething remains intact ing is a coarsening-upwardsequence, grading and is renamed the Gaylard member. The en- from shale to sandstone, containing marine tire Bullmoose and Chamberlain interval ap- TABLE OF FORMATIONS Duff and Lithologic Williams Gilchrist Gibson Unit (1984) (1983) (1987) Glanconitic sst. BIlESky chert conglomerate facies A I Upper coal Bluesky Chamberlain IllCaS”ES fades Bt member Sandstone BlWSky Middle Gethig facies B (Gethiig marine BUllmOOSE? Bluesky Fm. Shale tongue) member facies B Glauconitic sst. conglomerate, BllK.Sky Gaylard quartzitic sst. facies c Lower Gething Member Lower coal measures &thing Fm. Open File 1990-33 Figure 3. South to north schematic section of Bluesky unit in the Plains region from Smith et al., (1984) (see Figure 7 for cross-section location). The Blueskv unit as reuresented here is eauivalent to the combined chamberlain Bullmoose member in&al in the Fodthills. The briginal caption for’the figure reads: Schematic cross-section B-B’ illustrating the sequence of events that occurred in the study area during the transgression of the Moosebar sea. (1) A “Bluesy’ transgressive lag is formed as the sea advances across the Gething alluvial plain. (2) An increase in sediment supply results in the development of a prograding “Bluesky’ barrier bar/offshore bar system. (3) As the barrier progrades seaward, a bay/lagoon develops landward of the barrier. (4) The barrier system is ultimately overpowered by the sea and is once again transgressed. A transgressive lag caps the system. pears to be equivalent to the Bluesky unit of . Thicknesstrends of the combined Chamber- the Plains region (Figure 3). lain and Bullmoose member interval, il- A unit of chert-pebble conglomerate, lustrated by a stratigraphic fence diagram. glauconitic sandstone and pebbly mudstone may occur at the top of both the Gaylard and CHAMBERLAIN MEMBER the Chamberlain members. These deposits The Chamberlain member consists of reflect two separate transgressiveevents of the sandstone and shale with or without coal Moosebar sea. measures. In the Sukunka area it is ap- proximately 80 to 100 metres thick. It thins STRATIGRAPHIC TRENDS rapidly to the north, wedging out as a Stratigraphic data have been compiled in sandstoneunit in Moosebar marine shale near the form of a stratigraphic panel diagram (Fig- WA 5874. Southeast along the Foothills coal- ure 4) and a computer database(Appendix 1). belt it varies from 60 to 100 metres thick with The stratigraphic panel diagram illustrates an anomalouslylow thicknessin the vicinity of the following: QWD-7112. Perpendicular to the Foothills coalbelt the Chamberlain member thins and is n Basiclithology and distribution of the Cham- only 20 metres thick at the northeast corner of berlain and Bullmoose members within the the study area. Foothills and adjacent Plains area (NTS The extent of the coal facies within the 93P/2,3,4,5; 931114,15). Chamberlain member is shown in Figure 5. Stratigraphic and area1 distribution of the The boundary of the coal facies (as defined by more significant coal seams. the presenceor absenceof coal in geophysical density logs) runs roughly east-west in the 4 Geological Survey Bmnch Ministry of Enetgq, Mines and Petmleum Resounm Figure5. Area1 extent of coalfacies in theChamberlain member. Sukunka River area, swings east-southeast tributaries or fluvial channels, appear in the near Gwillim Lake, north in the vicinity of stratigraphic sequence. West Kiskatinaw River then reverts to a A thick and persistent sandstonefacies at southeast trend near Kiskatinaw River. The the base of the Chamberlain member appears edge of the coal facies is interpreted as the to represent wave-dominated delta-front approximate trace of the delta-top environ- deposits. At Mount Reesor, hummocky and ment(s) The sinuous trace is interpreted as swaly cross-stratification appears to represent several laterally linked deltas within a coastal storm activity on this front, alternating with plain setting. periods of quiescencemarked by horizons of The Chamberlain member beyondthe area intense vertical burrowing. To the south at of coal facies in Figure 5 is defined by Quintette, bioturbation is lacking and the
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