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75"30© sai 4615© Ministry of Hon. Alan W. Pope Minister Natural W.T. Foster MARGINAL NOTES Resources Deputy Minister Ontario Mapping of the Kemptville area involved the re-examination of part of an area mapped by A.E. Wilson (1940) for the Geological Survey of Canada, and later included in her larger work on the geology of the Ottawa-St. Law ONTARIO GEOLOGICAL SURVEY rence Lowland (Wilson 1946). Paleozoic bedrock outcrop is abundant in the southwestern part of the map-area, and moderately abundant in the north MAP P.2493 western part. Because of a thick cover of unconsolidated sediments, out GEOLOGICAL crop is sparse in the central and eastern parts of the map-area. Most expo SERIES - PRELIMINARY MAP sures in the present map-area contain only thin stratigraphic sections, PALEOZOIC GEOLOGY The main physiographic feature in the area is the Rideau River, which flows northward through the central and eastern parts of the area. The western OF THE part of the area forms part of the Smith Falls Limestone Plain, a physio graphic region wherein shallow soils of clay and loam are underlain by the dolostones and sandstones of the Beekmantown Group (Chapman and Putnam 1973). In the southeastern part of the map-area, the shallow soil is KEMPTVILLE overlain by sand deposits, forming the Edwardsburg Sand Plain. The north eastern part of the map-area forms part of the North Gower Drumlin Field. AREA PALEOZOIC STRATIGRAPHY SOUTHERN ONTARIO Beekmantown Group Scale 1:50000 The Beekmantown Group consists of, in ascending order, the Potsdam For Mile l l Mile mation, the March Formation, and the Oxford Formation, ol which only the - latter two outcrop in the present map-area. The Potsdam Formation out Comers Metres 1000 l Kilometre crops farther to the south in the BrocKvllle-Mallorytown map-area (Carson \X" 1982b).

March Formation (Lower Ordovician) NTS Reference: 31 G/4 ODM-GSC Aeromagnetic Map: 9G The March Formation, the oldest Paleozoic rock unit exposed in the present map-area, outcrops in the extreme southwest corner, forming low, pave ment-like exposures. Sections greater than two metres thick are rare in this map-area. eOMNR-OGS1982

The unit consists of interbedded light to medium grey, light to medium Parts of this publication may be quoted if credit is given and brown, and light to medium brown-grey sandstone, dolostone, sandy dolo the material is properly referenced. stone, and dolomitic sandstone that weather medium to dark grey and brown, and occur in beds 5 to 60 cm thick. The dolostone and sandy dolo This map is published with the permission ot E.G Pye, Di stone are generally fine to medium crystalline, and the sandstone is fine to rector, Ontario Geological Survey. coarse grained. Calcite-filled vugs up to 10 cm in diameter are common in the dolostone beds. Wilson (1946) estimated the thick ness of the formation to be 20 to 30 feet (l to 9 m) near Ottawa. Common fossils include gastro pods. The upper contact of the March Formation with the Oxford Formation is con formable and transitional, and is marked by the change from interbedded INDEX TO sandstone, dolostone, sandy dolostone and dolomitic sandstone to a con R 1196 R 1197 PALEOZOIC GEOLOGY t* tinuous sequence of dolostone, The contact is defined as the top of the IN THIS AREA highest occurring sandstone bed. May, 1982 TI , Oxford Formation (Lower Ordovician) The Oxford Formation outcrops predominantly in the southwestern part of the map-area, however isolated outcrops do occur in the eastern part, They are generally pavement-like, and thick sections are rare. The formation generally consists of light to dark grey, light to medium brown, and blue grey, finely to coarsely crystalline dolostone that weathers light to dark grey, pale to medium brown, and buff, and occurs in beds 5 to 40 cm thick. Vugs filled with pink, coarsely crystalline calcite are common throughout the formation, and white and black chert is present locally. Wil son (1946) reported a total thickness of 240 feet (73 m) in the Ottawa area for the Oxford Formation. Common fossils include gastropods. The upper contact of the Oxford Formation with the Rockclitfe Formation is \ disconformable and is marked by the change from grey and brown dolo stone to green and white calcareous sandstone. Chazy Group The Chazy Group consists of, in ascending order, the Rockcliffe Formation and the St. Martin Formation, of which only the Rockcliffe Formation out crops in the present map-area. The St Martin Formation does not occur in the western part of the Ottawa-St. Lawrence Lowland so that the Rockcliffe Formation is disconformably overlain by the Ottawa Formation in this map- LEGEND area. PALEOZOIC Rockcliffe Formation {Middle Ordovician) MIDDLE ORDOVICIAN Only two outcrops of the Rockcliffe Formation are present in the Kemptville map-area. They occur in the extreme centraf-westem part of the area, but 5 Ottawa Formation: crystalline and the formation is presumed to extend as a thin band outlining the northwest bioclastic limestone quadrant of the map-area. UNCONFORMITY The unit consists of pale to medium green and white calcareous sandstone that weathers green and occurs in beds 2 to 5 cm thick separated by shaly CHAZY GROUP partings Locally, subrounded sand grains occur in a silty matrix. The thick est section of the formation in the present map-area is less than 2 m, how 4 Rockcliffe Formation: sandstone and ever, Wilson (1946) reported a total thickness of 150 to 160 feet (45 to 49 m) shale in the Ottawa area, with the formation thinning considerably toward the western edge of the lowlands No fossils were recovered from the Rockcliffe UNCONFORMITY Formation in the present map-area. \ VC© LOWER ORDOVICIAN The upper contact of the Rockcliffe Formation with the Ottawa Formation is BEEKMANTOWN GROUP disconformable and is marked by the change from green sandstones to grey and brown limestones. 3 Oxford Formation: dolostone

Ottawa Formation (Middle Ordovician) 2 March Formation: interbedded sand stone, dolostone, The Ottawa Formation outcrops in the northwestern part of the map-area, sandy dolostone forming Inw, pavement-like exposures Thick stratigraphic sections occur and dolomitic sandstone only in quarries. The formation generally consists of medium to dark grey and light brown, li thographic to medium crystalline limestone that weathers predominantly light grey but also pale brown and pale brown-grey, and occurs in beds 5 to SYMBOLS 30 cm thick. The unit is commonly burrowed. Thin-bedded bioclastic lime stone occurs in the extreme northern part of the outcrop area. Common fos Bed rock outcrop sils include cephalopods, gastropods, brachiopods, and the coral Teiradium cetlutosum. Quarry The Ottawa Formation is correlative in part with carbonate units west of the • l -4^' Frontenac Arch that form the Black River-Trenton Group (Wilson 1946). /x/ Geological boundary, observed STRUCTURAL GEOLOGY Geological boundary, position approximate Although the northern part of the Ottawa-St. Lawrence Lowland is intensely faulted, the southern part of the basin is devoid of faults. Strata in the area Geological boundary, position interpreted are essentially flat-lying, and draping of the Paleozoic sediments over topo graphic highs in the Precambrian basement such as occurs in the Mer rickville and Brockville-Mallorytown map-areas to the south (Carson 1982a) is notably absent. SOURCES OF INFORMATION ECONOMIC GEOLOGY Topography from Map 31 G/4 (Kemptville) of the National At present, only one formation in the Kemptville area is being quarried Ca- Topographic Series. vanaugh Construction Company is extracting material from the Ottawa For mation near Munster (D.T.M. reference 424000E, 5004850N) for use as crushed stone. Small, intermittantly worked quarries are present in the other formations. CREDITS Geology by D M. Carson and assistants, 1981.

Every possible effort has been made to ensure the accuracy of the information presented on this map: however, the On tario Minislry of Natural Resources does not assume any lia bility for errors that may occur Users may wish to verify crit ical information; sources include both the references listed REFERENCES here, and information on file al the Resident or Regional Ge ologist©s office and the Mining Recorder©s office nearest the Carson, D.M map-area, 1982a Paleozoic Geology of the Merrickville Area. Southern Ontario, Ontario Geolog ical Survey, Map P 2494, Geological Series-Preliminary Map Scale 1:50 000. This project was funded equally by the Federal Department Geology 1961. of Regional Economic Expansion and the Ontario Ministry of Natural Resources under the Minerals Program of the East ern Ontario Subsidiary Agreement. 19B2b: Paleozoic Gftology of the Brockville-Mallorytown Area, Southern Ontario: On tario Geological Survey. Map P.2495, Geological Series-Preliminary Map, Scale 1:50000. Geology 1981. . Kemptville . Issued 1982 Chapman, L.J., and Putnam, D,J. 1973: The Physiography of Southern Ontario, Second Edition; Ontario Research Foundation, Toronto, 1973, 386p Information from this publication may be quoted if credit is Wilson, A.E. given. It is recommended that reference be made in the fol 1940: Map 588A, Nepean, Ontario: Geological Survey ot Canada. lowing form: 1946; Geology of the Otlawa-St. Lawrence Lowlands, Ontario and QueDec. Geologi Carson, D.M. cal Survey of Canada, Memoir 241, 66p. 1982: Paleozoic Geology of the Kemptville Area. Southern Ontario; Ontario Geological Survey, Map P.2493, Ge ological Series-Preliminary Map, Scale 1:50 000. Ge 45"00 45"00© ology 1981. 76 W 75030©