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Geological Series, Paleozoic Geology, Pembroke Area, Southern Ontario

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Geological Series, Paleozoic Geology, Pembroke Area, Southern Ontario THESE TERMS GOVERN YOUR USE OF THIS DOCUMENT Your use of this Ontario Geological Survey document (the “Content”) is governed by the terms set out on this page (“Terms of Use”). By downloading this Content, you (the “User”) have accepted, and have agreed to be bound by, the Terms of Use. Content: This Content is offered by the Province of Ontario’s Ministry of Northern Development and Mines (MNDM) as a public service, on an “as-is” basis. Recommendations and statements of opinion expressed in the Content are those of the author or authors and are not to be construed as statement of government policy. You are solely responsible for your use of the Content. You should not rely on the Content for legal advice nor as authoritative in your particular circumstances. Users should verify the accuracy and applicability of any Content before acting on it. MNDM does not guarantee, or make any warranty express or implied, that the Content is current, accurate, complete or reliable. MNDM is not responsible for any damage however caused, which results, directly or indirectly, from your use of the Content. MNDM assumes no legal liability or responsibility for the Content whatsoever. Links to Other Web Sites: This Content may contain links, to Web sites that are not operated by MNDM. Linked Web sites may not be available in French. MNDM neither endorses nor assumes any responsibility for the safety, accuracy or availability of linked Web sites or the information contained on them. The linked Web sites, their operation and content are the responsibility of the person or entity for which they were created or maintained (the “Owner”). Both your use of a linked Web site, and your right to use or reproduce information or materials from a linked Web site, are subject to the terms of use governing that particular Web site. 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[email protected] 5691 (inside Canada, United States) Crown Copyright Queen’s Printer Local: (416) 326-2678 Toll Free: 1-800-668-9938 [email protected] (inside Canada, United States) MARGINAL NOTES Sedimentary rocks of Ordovician age occur in Renfrew County in a The Lindsay Formation outcrops sparsely, and only in the number of fault blocks downthrown by tectonic events of probable southwestern part of Renfrew County on the south side of Lake Cretaceous age. Parts of two of these fault blocks occur within the Clear. As defined by Williams and Rae (1984). the Lindsay Forma- Pembroke map area. Satterly (1945) and Lumbers (1982) present tion consists of limestone of varying crystallinity and bedding generalized maps of the Paleozoic strata of the map area: how- thickness, with thin shale interbeds. The nodular texture of the ever, neither of these authors studied the sedimentary sequence limestone beds is characteristic of the formation. The upper con- Ontario Geological Survey in any detail. Kay (1942) carried out a stratigraphic reconnais- tact is regarded as marked by an increase in the shale content by sance study of the Paleozoic rocks, but concentrated on their Williams and Rae (1984). The overlying unit, named the Eastview MAP P. 2727 fossil content. Barnes (1967) made a detailed study of the Formation by A.E. Wilson (1946) is interbedded calcareous, some- sedimentology and conodont paleontology of three sections of what organic, shale and limestone. Based on an extensive drilling Geological Series - Preliminary Map restricted vertical extent located in the Golden Lake and Cobden program in equivalent strata throughout southern Ontario. Russell map areas (maps P.2729. P.2730, see index map). This map is one and Telford (1983) redefined the upper unit as the Collingwood of a series of map sheets showing the Paleozoic geology of the Member of the Lindsay Formation. The lower contact of the Collin- Ottawa Valley (e.g. Williams and Rae 1984; Williams, Wolf and Rae gwood Member tends to be gradalional, whereas the upper con- PALEOZOIC GEOLOGY 1984) and Renfrew County tact, between it and the non-calcareous shales of the Blue Moun- The major structural feature of the Renfrew County area is the Jf ¥^ffS£SSi ^ZtT J? tfJSES 2 in souT PEMBROKE AREA northwesterly trending Ottawa-Bonnechere Graben. Within this fea- sharp. The Collingwood M*as ^^t^ lure northwest of Renfrew County, at Brent (PA440990). Restoule astern *en"ew CountV ,n res,ric,ed s,ream exposures. SOUTHERN ONTARIO (PB103060) and Lake Nipissing (PB100240), additional fault Thicknesses of both the Lindsay Formation (sensu stncto) and blocks occur which contain Middle Ordovician rocks. The Lake the Collingwood Member are impossible to determine. At least 15 Scale 1:50 000 Timiskaming outlier (NC970620) contains Middle and Upper Or- m of the former is present in the area, but this represents only ha dovician strata equivalent in age to the upper parts of the se- of that encountered in the Geological Survey of Canada Russei M»„f. 1000 0 I K.lometre quence in Renfrew County. Formations of Lower Ordovician age well (Williams, Rae and Wolf 1985). A total thickness of 10.7 m of M.le 1 0 1 M'le do not extend northwest of Renfrew County strata equivalent to the Collingwood Member was intersected in i r }-t B-|—r^ >—-i ' ^^ The major physiographic feature of the Pembroke map area is 'he °™"° Geological Survey S.I.S. well 10 (Johnson et a/. 1983). the Ottawa River, which flows southeastward. This trend parallels NTS Reference: 31 F/14 N that of the Ottawa-Bonnechere Graben (Lumbers 1980) Extending DA| rrr,-7nir% onr k' m ITPROPQ IN THF PFMBROKE ODM-GSC Aeromagnetic Map: 1436G in zones roughly parallel to this trend are parts of (a) the Ottawa ™UEO£UJL, HUOK UU I OKUrs IIN I Mt rtMonwiyc OGS Geological Compilation Map: 2441 Valley Clay Plain, closest to the river, and (b) the Petawawa Sand MAP AREA Plain (Chapman and Putnam 1984) The latter is bounded on its _ , , . , . rt_, rtVtftnt in th*. S«3 "V an a,ea of ex.enU Parian, rocK „, Afljoug^ •*£« ^^oZ^^ZS. o. !nt The small amount of Paleozoic rock in the area is represented by rwiiwww ",*? ° "• rr' . ,„ iZJrJ2ZL TKT»W*IU inetonro in outcrops on the north side of Cotnam Island (UF412744). on the lower part of the sequence occur ^J^^^y^^ * Muskral River near Pembroke (UF363736). and the Pembroke «•«*•» C™W «J«• ^l^o^^iZ^S^^^^ Ouarry (UF3760746). The only example in Renfrew County of an exposed occurs at the Highway 62 road bridge.over the.Ottawa exposed depositional contact between Paleozoic and Precambrian g*» on the north Side of Cotnam Island, r. addmoto the typical rnrk* ornifi at the Cotnam teland bridoe outcroD Here the lithology of the unit, this outcrop exhibits ripple marks, well devel- d f P aneS Oxford "oration '^c^wZfimt^tn c"sta..!ne °^ h~^^ ° ^^ ' rock. All other contacts between Paleozoic and Precambrian rocks and beds of pink argillaceous dolostone. in the area are faulted Tne most northwesterly outcrop of the Rockcliffe Formation occurs along the Muskrat River south of Pembroke. At this locality, the lithology of the formation is variable, ranging from extremely PALEOZOIC STRATIGRAPHY OF RENFREW poorly sorted quartz pebble conglomerates to fissile red shales COUNTY and ar9'llaceous SUD lithographic dolostones in a vertical section of less than five metres. Rocks of Lower, Middle and Upper Ordovician age occur in sev- Outcrops of the Gull River Formation occur in the Pembroke eral fault blocks in Renfrew County. Due to the relatively sparse Ouarry and on the northeast side of Cotnam Island. All of these outcrop of the Ordovician strata, the restricted stratigraphic range outcrops expose rocks of lithological association a (see above) of the available exposures, and the lack of borehole data, the and thus are definitely assignable to the Gull River Formation. To stratigraphy of these units is not as well defined as in areas to the maintain consistency with adjoining map sheets, however, the southeast (e.g. Williams and Rae 1984). The following general composite unit nomenclature is maintained on the map. discussion of the Paleozoic rock units in Renfrew County is drawn from observations from all six map-sheets which cover the area, shown on the index map.
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