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Rcne Fontaine Ministry of M i n L©-.l ei MARGINAL NOTES The Lindsay Formation outcrops sparsely, and only in the Northern Development GeorgeTough southwestern part of Renfrew County on the south side of Lake and Mines Deputv Mnisler Sedimentary rocks of Ordovician age occur in Renfrew County in a Clear As defined by Williams and Rae (1984). Ihe Lindsay Forma Ontario number of fault blocks downthrown by teclonic vents of probable tion consists of limestone of varying crystallinity and bedding Cretaceous age. Part of one large fault block and three smaller thickness, with thin shale interbeds. The nodular texture of the limestone beds is characteristic Ontario Geological Survey fault slices occur within the Brudenell map area. Satterly (1945) of the formation. The upper con tact is regarded as and Lumbers (1982) present generalized maps of the Paleozoic marked by an increase in the shale conlenl by Williams and Rae MAP P.2731 strata of the map area. However, neither these authors (1984). The overlying unit, named the Eastvtew nor Formation by Wilson (1946), is interbedded, calcareous, Themistocleous (1981). who published somewhat a more detailed map of the organic, shale and limestone. Based on an extensive Geological Series - Preliminary Map northern part of the map area, studied the sedimentary sequence drilling pro in any gram in equivalent strata throughout southern Ontario, Russell and detail. Kay (1942) carried out a stratigraphic reconnais Telford (1983) redefined sance study the upper unit as the Collingwood Mem of the Paleozoic rocks, but concentrated on the fossil ber of the Lindsay Formation. content. Barnes The lower contact of the Colling (1967) made a detailed study of the sedimen wood Member tends to be gradational. tology and conodont whereas the upper contact, PALEOZOIC GEOLOGY paleoniology of three sections of restricted between it and the non-calcareous shales of the Blue Mountain vertical extent in the Golden Lake and Cobden map areas maps Formation (Billings Formation in the Ottawa Valley) is rather sharp. (P. 2729, P. 2730, see index map). This map is one of a series of The Collingwood Member, as so defined, occurs in southwestern map sheets showing the BRUDENELL AREA Paleozoic geology of the Ottawa Valley Renfrew County in restricted stream exposures. (Williams and Rae 1984; Williams, Wolf and Rae 1984) and Ren SOUTHERN ONTARIO frew County. Thicknesses of both the Lindsay Formation (sensu stricto) and Ihe Collingwood Member are impossible to determine. At least The major structural feature of the Renfrew County area is the 15 m of the former is present in Scale 1 50 000 Ottawa -Bon nee here the area, but this represents only Graben, a northwesterly trending feature of half of that encountered in the Geological Survey of Canada Cretaceous age. Within this feature northwest of Renfrew 1000 O l Kilometre County, Russel! well (Williams, Rae and Wolf 1985). A total thickness of at Brent (PA940990). Restoule (PB1 03060), and Lake Nipissing 10.7 m of strata equivalent to the Collingwood Member was inter l M.le (PB100240), additional fault blocks occur which contain Mile l O Middle sected in the Ontario Geological Survey S.I.S. well 10 (Johnson et IB: Ordovician rocks. The Lake Timiskaming outlier (NC970620) con al. 1983). tains Middle and Upper Ordovician strata equivalent in age to the upper parts of the sequence in Renfrew County. Formations of NTS Reference: 31 F/6 ODM-GSC Aeromagnetic Map: 100G Lower Ordovician age do not extend northwest of Renfrew County. PALEOZOIC ROCK OUTCROPS IN THE BRUDENELL OGS Geological Compilation Map: The dominant physiographic feature of the area shown on the MAP AREA 2441 Brudenell map sheet is a fault-controlled- north-facing scarp mark ing the southern boundary of the Ottawa -Bonnechere menten (Kay Although restricted in areal extent, the Paleozoic rock outcrops 1942; Lumbers 1980) This scarp strikes approximately southeast, exposed in the Brudenell map area span a large stratigraphic 1985 Government of Ontario and separates Precambrian rocks of the Opeongo Mountains in the range. The largely pavement-type outcrops in the extreme north south from fault blocks of Paleozoic and Precambrian rocks to the east of the area, represent Ihe ambiguous series of strata at the Printed in Ontario, Canada north. The fault scarp, together with associated faulting, controls contact between the Gull River and Bobcaygeon Formations. Thin Parts of this publication may be quoted the location of if credit is Lake Clear. Extensive outcrops of Precambrian rock slices of Ordovician rock preserved on the downthrown sides of given and the material is properly referenced. in the southern part of the area give way to sporadic outcrop north major faults on the north side of Lake Clear and at Esmonde are and east of Lake Clear, Outcrop of Paleozoic rock is restricted to composed primarily of liihologicat association b, of the composite This map is published with the permission of V.G. the vicinity of fault zones near Lake Clear and as pavement Gull Rlver/Bobcaygeon unit. However, both fault slices also con Milne, Director, Ontario Geological Survey. outcrop in a faull block in the northeastern corner of the area. The tain the heavily dolomitized, coarsely crystalline facies of this Precambnan-Paleozoic unconformable contact is not exposed in composite unit, often associated with fault zones. the area, this contact being faulted in all cases. INDEX TO PRELIMINARY The Brudenell map area is unique in Renfrew County for its PALEOZOIC GEOLOGICAL extensive exposures of the Verulam Formation and Ihe single MAPS IN THIS AREA PALEOZOIC STRATIGRAPHY OF RENFREW outcrop in the county of the Lindsay Formation (sensu stricto and Collingwood Member) The Verulam Formation outcrops along the COUNTY south shore of Lake Clear in small cliffs up to 15m high, artf in Rocks of Lower, Middle, and Upper Ordovician age occur in Falls Creek (UF273332). Al the latter outcrop, it is faulted to the several fault blocks in Renfrew County. Due lo the relatively south against nodular limestone of the Lindsay Formation. Along sparse outcrop of the Ordovician strata, the restricted stratigraphic Neilans Creek (UF247340), the transition zone between the nodu range of (he available exposures, and the lack of borehole data. lar limestone and the organic, carbon-rich, highly calcareous shale the stratigraphy of these units is not as well defined as in areas to of the Collingwood Member is exposed. The Collingwood Member ihe southeast (Williams and Rae 1984). The following general is faulted against Precambrian rocks along the Mount St. Patrick discussion of the Paleozoic rock units in Renfrew County is drawn Fault. "s P2726 Wwhe,,e, from observations Irom all six map sheets which cover the area, shown on the index map. Subdivisions of the Paleozoic sequence used by Williams and Rae (1984) for the Ottawa area have been STRUCTURAL GEOLOGY employed, with minor revisions in Renfrew County. The map area is transected by many steeply dipping faults or fault The oldest Paleozoic unit in Renfrew County is the Lower zones (including the Mount St. Patrick, Shamrock, and Packenham Ordovician Oxford Formation (Wilson 1946). The Nepean and Faults of Kay 1942) which generally strike northwest. Only those March Formations, which underlie the Oxford Formation in ihe faults which control the outcrop distribution of Paleozoic rocks are Arnprior area (Williams, Wolf and Rae 1984) therefore do not shown on the map. Many other faults (not shown) affect only the extend any farther northwest. The Oxford Formation is character Precambrian rocks. The detection of faults with relatively small ized by light to medium grey sublithographic to finely crystalline displacement is possible in areas with Paleozoic strata present. dolostone of variable bedding thickness The full stratigraphic The fault distribution as shown should not therefore be interpreted thickness of the formation is never exposed m Renfrew County. as showing the true fault density in the map area. The location of Wilson (1924) estimated its thickness as a maximum of 9 m (30 faults has been determined largely from topographic evidence, A K E o N r A R i o .^ feet) in the Arnprior area. Since Ihe Oxford Formation is the lowest such as steep scarps, linear drainage courses, and low-lying sedimentary unit in Renfrew County, its thickness may vary con areas, Bedding is normally close to horizontal; in areas close to siderably depending on local topography of the Precambrian sur fault zones, bedding often becomes steeply dipping. Fault traces face, are generally straight but are commonly curved in the area of fault LEGEND As with the Oxford Formation, the Rockcliffe Formation is junctions. The displacements at fault junctions is approximately sparsely exposed, but is assumed to exist in the subsurface In all equal lo the sum of displacements along each set of faults which PHANEROZOIC the Paleozoic fault blocks of Renfrew County. Its lithology is branches from the junction. The largest measurable displacement PALEOZOIC highly variable, but it is an almost entirely terrigenous unit, varying across a fault in the area is between Precambrian rock and the UPPER ORDOVICIAN from blue-grey siltstones to red conglomerates. Thickness es Collingwood Member of the Lindsay Formation along Neilans timates for the Rockcliffe Formation in the Arnprior area range Creek. The minimum vertical displacement across this fault, the from 15 to 30 m (50 to 100 feet; Wilson 9 9b Collingwood Member. Lindsay Formation: 1924; Kay 1942). The full Mounl St. Patrick Fault, is 190 m. J interbedded, stratigraphic thickness of the unit in Renfrew County is never organic, brown and dark grey. exposed. calcareous shale and finely crystalline limestone ECONOMIC GEOLOGY The division and nomenclature of the Middle and Upper Or MIDDLE-UPPER ORDOVICIAN dovician carbonate strata of eastern Ontario, especially the se No quarries have exploited 9a Lindsay Formation sublithographic to finely quence now referred to as the Gull River and Bobcaygeon Forma the Paleozoic rocks of the area. In the crystalline limestone, nodular in tions, has been the subject of extensive discussion (Barnes 1967. general area of the Ottawa-Don nee here Graben, there are minor part, with 1968; Kay 1968). Disputes such as this often revolved around the occurrences of low temperature vein mineralization (calcite- inlerbeds of calc-arenile and shale fluorite-barite-gaiena-sphalerite-chalcopyrite), use of formational names in both lithostratigraphic and biostratig which cut Ordovi MIDDLE ORDOVICIAN raphic senses. Liberty (1967) attempted to resolve this situation by cian strata (Lumbers 1982; Williams, Wolf and Rae 1984). employing the purely lithostratigraphic subdivision of equivalent strata which occur west of the Frontenac Axis to the sequence Verulam Formation: interbedded bioclastic east of the axis. This nomenclature replaced the term "Ottawa REFERENCES limestone, sublithographic to finely crystalline Formation" erected by Wilson (1946). Williams and Rae (1984) Barnes, C.R. limestone, and shale followed the suggestions of Liberty (1967), but elevated the term 1967: Stratigraphy and Sedimentary Environments of some Wilder "Ottawa" to group status, this occupying a similar position to the ness (Ordovician) Gull River and Bobcaygeon Formations: (a) Limestones, Ottawa Valley, Ontario; dolostone term "Simcoe Group" of the area west of the Frontenac Axis. In Canadian Journal of Earth Sciences, Volume 4, p.209-244. and lithographic limestone; (b) finely the areas of the Ottawa Valley east of Arnprior, therefore, the Gull crystalline to lithographic limestone; (c) River, Bobcaygeon. Verulam, and Lindsay Formations of the Ot 1968: Reply: Stratigraphy and Sedimentary Environments of some sublithographic limestone to calc-arenite; (d) tawa Group are recognized. In Renfrew County, changes in the Wilderness (Ordovician) Limestones, Ottawa Valley, Ontario; coarsely crystalline dolostone stratigraphic succession necessitate only slight modifications to Canadian Journal of Earth Sciences, Volume 5, p. 169-172. this scheme. Johnson, M.D., Russell, D.J., and Telford, P.G. Rockcliffe Formation: red and green The Gull River Formation is characterized by a dolomitic, shaly 1983: Oil Shale Assessment Project, Volume 1, Shallow Drilling conglomerates, sandstones and shales lower part (equivalent to the Pamelia Formation of New York State) Results 1981/82; Ontario Geological Survey, Open File Re and an upper section of very finely crystalline limestone, typified port 5459, 20p. by dove grey weathering lithographic limestone (equivalent to the Kay. G.M. Lowville and Chaumont Formations of New York State). Williams, "Oxford Formation: 1942: Ottawa-Bonnechere Graben and Lake Ontario Homocline; sublithographic to finely Wolf and Rae (1984) defined Ihe upper contact of the Gull River crystalline dolostone Formation in the Arnprior area as the top of the topmost lithog Geological Society of America, Bulletin, Volume 53, p, 585-646. raphic bed. The overlying Bobcaygeon Formation is characterized UNCONFORMITY by coarse calc-arenitic limestones interbedded with finely cry 1968: Discussion: Stratigraphy and Sedimentary Environments of stalline limestones. In the area east of Renfrew County, sections some Wilderness (Ordovician) Limestones, Ottawa Valley. containing calc-arenites have no lithographic limestones; con Ontario, by C.R. Barnes; Canadian Journal of Earth Sci ences, Volume 5, p. versely, those sections with lithographic limestone do not contain 166-169. Undifferentiated metamorphosed and igneous calc-arenites. However, in many sections exposed in Renfrew Liberty, B.A. rocks County, lithographic and calc-arenitic limestones are interbedded 1967: Ordovician Stratigraphy of Southern Ontario: in the contact zone between the formations. trie Ottawa NOTES: Mosi of both the Valley Problem; p.49-50 in Abstracts of Papers, Geological upper part of the Gull River Formation and the lower part of the ©indicates units which do not occur in the map area Association of Canada-Mineralogical Association of "indicates units which Bobcaygeon Formation is blue grey sublithographic to finely cry Canada, International Meeting. occur in the map area only in the subsur stalline limestone; the "typifying lithology" (i.e. either lithographic face. or calc-arenitic limestone) is not the dominant lithology in either 1969: Paleozoic Geology of the Lake Simcoe Area, Ontario; Geo formation. Because of these difficulties, discrimination of the Gull logical Survey of Canada, Memoir 355, 20Ip. River and Bobcaygeon Formations has not been attempted in Lumbers, S.B. Renfrew SYMBOLS County, a composite unit being shown on the maps. 1980: Geological Setting However, individual outcrops have been labelled according to the of Alkalic Rock-Carbonatite Complexes in Eastern Canada; p.81-89 in Proceedings of dominanl lithological associations presented at that location. The the 1st Interna Bedrock outcrop Quarry subdivisions are as follows: tional Symposium on Carbonatites, edited by J.C. Brager, Pocos de Caldos, Brazil. Lithological Description Fault, position Geological Association 1982: Summary of Metallogeny, Renfrew County Area; Ontario Geological approximate (arrow boundary, position Survey Report 212, 58p. Accompanied by Maps indicates approximate 2459. 2460. 2461. and 2426. scale 1:100 ooo and chart. a interbedded silty dolostones, lithographic to fine downthrown side) limestone and shale (i.e. the lower part of the Russell. D.J., and Telford. P.G. Gull River Formation) 1983: Revisions to the Stratigraphy of the Upper Ordovician Collin gwood Beds of Ontario - A Potential Oil Shale. Canadian b generally sublithographic to finely crystalline, Journal of Earth Sciences, Volume 20, p. 1780-1790. SOURCES OF INFORMATION with minor lithographic blue-grey, limestone (i. e Satterly, J. Topography from map 31 F/6 of the National Topographic Series. the upper part of the Gull River and lower part of 1945: Mineral Occurrences in the Renfrew Area; Ontario Depart Ihe Bobcaygeon Formatons) ment of Mines, Annual Report for 1944, Volume 53. Part 3, Metric conversion factor: 1 fool = 0.3048 m. 139p. Accompanied by Map No, 53b, scale 1 inch to 2 c interbedded sublithographic lo fine limestone miles. and coarse calc-arenitic limestone (i.e. Bobcaygeon Formation) Themislocleous. S.G. 1981: Geology of the Clontarf Area, Renfrew County; Ontario CREDITS d medium bedded coarsely crystalline dolostones Geological Survey, Report 209. 64p. Accompanied by Map 2433. scale (only associated wilh faull zones) 1:31 680. Geology by D.J. Russel! and D.A. Williams, 1981, 1983, 1984. Williams, D.A., Thicknesses of either formation or the composite unit are and Rae, A.M. impossible to determine with any accuracy due to the lack of 1984: Paleozoic Geology of the Ottawa Area: Ontario Geological Every possible effort has been made to ensure the accuracy of borehole data and of outcrops exposing useful sections. Kay Survey Map P.2716. Geological Series-Preliminary Map, the information presented on this map. however, ihe Ontario Min (1942) estimated a total thickness of 81 m (270 feet) for strata scale 1:50 000. istry of Northern Development and Mines does no assume any between the Rockcliffe and the Verulam Formation. However, this Williams, D.A.. Rae, A.M., and Wolf, R.R. liability for errors that may occur Users may wish to verify critical information; sources include is based on broad extrapolation of dips and outcrop widths, and 1985; Paleozoic Geology of the Russell-Thurso Area; Ontario Geo both the references listed here, and information on file at the Mining Recorder©s may be seriously in error. In the closest drillhole, the Lebreton well logical Survey, Map 2717, Geological Series-Preliminary office nearest the map area. at Ottawa (Williams and Rae 1984), the Gull River Formation is Map, scale 1:50000. 42.7 m ihick and the Bobcaygeon Formation is 86.6 m thick. Williams, D.A.. Wolfe. R.R.. and Rae, A.M. Subdivision of the upper par! of the Ottawa Group is less Issued 1985 contentious. The Verulam Formation is characterized 1984: Paleozoic Geology of the Arnprior-Quyon Area; Ontario Geo by thin inter- logical Survey. beds of limestone and shale. The limestone Map 2726, Geological Series-Preliminary Information from this publication may be quoted if credit is given. beds vary from Map, scale 1:50000. sublithographic to calc-arenitic, are often bioclastic, and are very II is recommended that reference to this map be made in the thin to medium bedded The shale is dark grey and blue-grey. Wilson, A.E. --f: following form: usually fissile, and occurs in beds less than 8 cm thick. A mini 1946: Geology of the Ottawa-St. Lawrence Lowlana, Ontario and mum thickness of 15m can be established from the available Quebec; Geological Survey of Canada. Memoir 241, 66p, data in Renfrew County, which Russell, D.J.. and Williams, D.A. is less lhan half of the thickness of Wilson. M.E. 32 m of Verulam Formation found in the Geological Survey of 1985: Paleozoic Geology of the Brudenell Area, Southern Ontario; Canada Russell well, drilled in the Russeli-Thurso area to the east 1924: Arnprior-Quyon and ManiwaKi Area, Ontario and Quebec; Ontario Geological Survey, Map P.2731, Geological Series- (Williams, Rae and Wolf 1985). Geological Survey of Canada. Memoir 136. 152p. Preliminary Map. scale 1:50000, Geology 1981, 1983, 1984.