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The Sangamonian Pointe-Fortune Site, Ontario-Québec Border Document generated on 10/01/2021 4:44 p.m. Géographie physique et Quaternaire The Sangamonian Pointe-Fortune Site, Ontario-Québec Border Le site sangamonien de Pointe-Fortune, à la frontière du Québec et de l’Ontario Der sangamonische Fundplatz von Pointe-Fortune an der Grenze zwischen Ontario und Québec Thane W. Anderson, John V. Matthews, Robert J. Mott and S. Henry Richard The Last? Interglaciation in Canada Article abstract Le dernier (?) interglaciaire au Canada Inter-till sediments (Units 2, 3, 4) in a sand pit located 115 km east of Ottawa, Volume 44, Number 3, 1990 Ontario, contain a predominance of deciduous tree pollen including oak. elm, beech and hickory {Quercus, Ulmus, Fagus, and Carya) and minor amounts of URI: https://id.erudit.org/iderudit/032829ar basswood, ash and sweetgum (TiHa, Fraxinus and Liquidambar). Unit 4 also DOI: https://doi.org/10.7202/032829ar contains macrofossils of several plant taxa which presently do not grow much north of the site. The fossils portray an inter-glacial environment (the Sangamonian) with conditions as warm as or warmer than the present in the See table of contents area. By contrast, overlying Unit 4a reveals a dominance of boreal indicators such as pollen of spruce, pine, willow and alder (Picea, Pinus, Salix and Alnus) and the beetles, Bembidion transparens, Eucnecosum, and Olophrum boréale. Publisher(s) Unit 4a fossils indicate a climate that was colder than at present but no colder than the climate of central Québec - suggesting a correlation with the waning Les Presses de l'Université de Montréal phase of the warm interval, or alternatively, with the St. Pierre Interstade of the St. Lawrence Lowlands. Thus the lower till is interpreted as lllinoian in age; ISSN the upper till may be Middle to Late Wisconsinan or Early to Late Wisconsinan. 0705-7199 (print) 1492-143X (digital) Explore this journal Cite this article Anderson, T. W., Matthews, J. V., Mott, R. J. & Richard, S. H. (1990). The Sangamonian Pointe-Fortune Site, Ontario-Québec Border. Géographie physique et Quaternaire, 44(3), 271–287. https://doi.org/10.7202/032829ar Tous droits réservés © Les Presses de l'Université de Montréal, 1990 This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research. https://www.erudit.org/en/ Géographie physique et Quaternaire, 1990. vol, 44, n° 3, p. 271-287, 14 fig.. 2 tabl. THE SANGAMONIAN POINTE-FORTUNE SITE, ONTARIO-QUÉBEC BORDER* Thane W. ANDERSON, John V. MATTHEWS, Jr.. Robert J. MOTT and S. Henry RICHARD**, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8. ABSTRACT Inter-till sediments (Units 2, 3, RÉSUMÉ Le site sangamonien de Pointe- ZUSAMMENFASSUNG Der sangamonis- 4) in a sand pit located 115 km east of Ottawa, Fortune, à la frontière du Québec et de l'On­ che Fundplatz von Pointe-Fortune an der Ontario, contain a predominance of deciduous tario. Les sédiments contenus entre deux Grenze zwischen Ontario und Québec. tree pollen including oak. elm, beech and hick­ couches de till (unités nos 2, 3 et 4), situés Zwischen-Till-Sedimente (Einheiten 2, 3, 4) in ory {Quercus, Ulmus, Fagus, and Carya) and dans une sablière, à 115 km à l'est d'Ottawa, einer Sandgrube 1,5 km ôstlich von Ottawa, minor amounts of basswood, ash and en Ontario, renferment surtout des grains de Ontario, enthalten vor allem Pollen von sweetgum (TiHa, Fraxinus and Liquidambar). pollen de feuillus, dont le chêne, l'orme, le Laubbàumen, darunter Eiche, Ulme, Bûche Unit 4 also contains macrofossils of several hêtre et le caryer (Quercus, Ulmus, Fagus et und Hickory (Quercus, Ulmus, Fagus und plant taxa which presently do not grow much Carya ) et des quantités moins importantes de Carya) und geringere Mengen von Pollen von north of the site. The fossils portray an inter- pollen de tilleul, de frêne et de liquidambar Linde, Esche und Liquidambar (770a, Fraxinus glacial environment (the Sangamonian) with (TIIIa, Fraxinus et Liquidambar). L'unité n°4 und Liquidambar). Die Einheit 4 enthâlt auch conditions as warm as or warmer than the renferme aussi des macrofossiles de divers Makrofossile von verschiedenen Pflanzen- present in the area. By contrast, overlying Unit taxons de végétaux qui ne croissent plus Taxa, welche gegenwàrtig nicht mehr viel nôr- 4a reveals a dominance of boreal indicators beaucoup au nord de la région. Les fossiles dlich des Platzes wachsen. Die Fossile geben such as pollen of spruce, pine, willow and reflètent un milieu interglaciaire (le ein BiId einer interglazialen Umwelt (das alder (Picea, Pinus, Salix and Alnus) and Sangamonien) où le climat était au moins Sangamonium), die so warm wie oder warmer the beetles, Bembidion transparens, aussi chaud que maintenant. Au contraire, als die gegenwàrtige in dem Gebiet war. Im Eucnecosum, and Olophrum boréale. Unit 4a l'unité n° 4a, susjacente, renferme surtout des Gegensatz dazu enthàlt die daruberliegende fossils indicate a climate that was colder than indicateurs de milieu boréal comme les pol­ Einheit 4 ùberwiegend Indikatoren nôrdlichen at present but no colder than the climate of lens d'épinerte. de pin. de saule et d'aulne Milieus, wie Pollen von Rottanne, Kiefer, central Québec — suggesting a correlation (Picea, Pinus, Salix et Alnus) et les coléop­ Weide und Erie (Picea, Pinus, Salix und with the waning phase of the warm interval, tères Bembidion transparens, Eucnecosum Alnus) und die Kàfer Bembidon transparens, or alternatively, with the St. Pierre Interstade et Olophrum boréale. Les fossiles de l'unité Eucnecosum und Olophrum boréale. Fossile of the St. Lawrence Lowlands. Thus the lower n°4a témoignent d'un climat plus froid que der Einheit 4a weisen auf ein Klima, das kàlter till is interpreted as lllinoian in age; the upper celui d'aujourd'hui, mais pas plus froid que als gegenwàrtig war, aber nicht kàlter als das till may be Middle to Late Wisconsinan or Early celui du centre du Québec, laissant ainsi Klima des Zentrums von Québec, was auf to Late Wisconsinan. entrevoir une corrélation avec la fin de l'inter­ eine Korrelation mit der ausgehenden Phase valle chaud, ou alors avec l'Interstade de des warmen Intervalls oder aber mit dem St. Saint-Pierre des basses terres du Saint- Pierre Interstadium des Tieflands des St. Laurent. Ainsi, le till inférieur remonterait à I1II- Lawrence schliessen lâsst. So wird das Alter linoien; le till supérieur pourrait dater du des unteren Tills auf das lllinoium datiert; das Wisconsinien moyen à supérieur ou du obère Till kônnte minières bis spates Wisconsinien inférieur à supérieur. Wisconsinium oder frùhes bis spates Wisconsinium sein. * Geological Survey of Canada Contribution No. 16990 ** Deceased in 1987 Manuscrit reçu le 16 janvier 1990; manuscrit révisé accepté le 18 juin 1990 272 T.W. ANDERSON. J. V. MATTHEWS, Jr., R. J. MOTT and S. H. RICHARD INTRODUCTION val within the exposed sand unit and concluded that the fossil evidence supported the Gadd et al. (1981 ) assignment of the A sand pit located about 115 km east of Ottawa, Ontario has sand and organic unit to the St. Pierre Interval which has been become a significant site in deciphering the Quaternary history renamed Les Becquets Interstade (Lamothe, 1989). Since that of the Ottawa Valley. The sand pit, owned and operated by M. study, new evidence has come to light which offers an alter­ Réjean Bélanger, is located on the Ontario-Québec border native explanation for the sand unit (Anderson et al., 1988). 2.2 km south of the community of Pointe-Fortune, Québec (site This new evidence is primarily based on pollen studies of the 1, Fig. 1 ); it is thus referred to here as the Pointe-Fortune site. organic-bearing sand and silt and interbedded clay which Exposed sediments at the site were initially interpreted by extends to about 8 m below the pit floor. Gwyn and Thibault (1975) as till overlying crossbedded glacio- In this paper we examine plant and insect fossils extracted fluvial sand. Prichonnet (1977) proposed a fluvial origin for the from both the exposed and buried sediments in the sand pit sub-till sands. Richard (1978) related the sand to subaqueous (units 3 and 4 of Veillette and Nixon, 1984) and infer the outwash deposited in the Champlain Sea. Gadd et al. (1981 ) paleoenvironmental and paleoclimatic conditions existing at the discussed the sediments observed in an excavation in the floor time of deposition. Based on these findings, we show the strat­ of the pit and described preliminary fossil identification carried igraphie position of these sediments in the Quaternary out on a grab sample from these sediments. They argued sequence of events for the central St. Lawrence Lowlands. against the glacio-fluvial and glacial marine origins for both the exposed and buried deposits. Based on a wood date of > 42,000 years BP from the sub-floor, organic-rich sands and REGIONAL PHYSIOGRAPHY, CLIMATE AND that the overlying till is probably equivalent to the Gentilly Till VEGETATION of the St. Lawrence Lowland, they suggested a probable cor­ relation of the organic-rich sands with the St. Pierre Sediments PHYSIOGRAPHY of the St. Lawrence Lowland. Veillette and Nixon (1984) dealt The sand pit is situated along the south shore of the Ottawa in more detail with the overall stratigraphy including both the River within the St. Lawrence Lowlands physiographic region exposed and buried sediments. They developed a stratigraphie of Bostock (1970).
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