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Geological and hydrogeological investigations of the Oak Ridges Moraine and Greater Toronto Area have been used to develop a regional stratigraphic framework. This framework is used to develop a data-driven stratigraphic model by integrating new field data with archival data in a relational database. A multistep approach is used that involves i) manual stratigraphic interpretation of subsurface data, ii) interpretation and integration of Ministry of Environment water-well data to refine elevation variability, iii) generation of individual stratigraphic surfaces that integrate geological map boundaries, and iv) generation of semiquantitative confidence maps. The structural elevation surfaces can be used to produce sediment-thickness maps and rendered three-dimensional volumes, and to constrain hydrogeological modelling. Municipalities, conservation authorities, and other agencies can use this stratigraphic model to provide a regional context and to improve the hydrogeological understanding of site specific investigations. 1 Contribution of the Oak Ridges Moraine NATMAP Project 1 Resume : Les etudes geologiques et hydrogeologiques de la Moraine d’Oak Ridges et de la grande region de Toronto ont permis d’elaborer un cadre stratigraphique regional. Ce cadre servira a mettre au point un modele stratigraphique construit a l’aide de donnees en integrant les nouvelles donnees de terrain aux donnees archivees dans une base de donnees relationnelle. La demarche multiphases adoptee comprend i) l’interpretation stratigraphique des donnees de subsurface effectuee manuellement, ii) l’interpretation et l’integration des donnees du ministere de l’Environnement collectees dans des puits artesiens afin de perfectionner la variabilite des elevations, iii) la creation de surfaces stratigraphiques individuelles qui integrent les frontieres des cartes geologiques et iv) la production de cartes de confiance semi-quantitatives. Les surfaces d’elevation structurale peuvent etre utilisees pour dresser des cartes de l’epaisseur des sediments et des volumes tridimensionnels et pour fixer des limites a la modelisation hydrogeologique. Les municipalites, les offices de la protection de la nature et d’autres organismes peuvent se servir de ce modele stratigraphique pour elaborer un contexte regional et ameliorer les donnees hydrogeologiques collectees lors d’etudes specifiques a un site.

Regional three-dimensional stratigraphic modelling of the Oak Ridges Moraine area, southern Ontario