Résumés
Abstract
The general extent, outlet location at North Bay, and shoreline tilt pattern of glacial Lake Algonquin were established by Spencer, Gilbert, Taylor, and Goldthwait about a century ago. Chapman and Harrison in the mid 1900s identified several eastward outlets and suggested correlations to named water planes as retreating ice lowered Algonquin levels. The present work supplements the meagre available North Bay shoreline elevation data with about 30 new points. Probable Cedar Point, Payette, Sheguiandah, and Korah shorelines are identified; several lower levels have no known outlets. Algonquin shoreline tilts are about 1.4 metres per kilometre. Using Nipissing shoreline elevations for correlation, North Bay data are compared with Sudbury data, showing closely similar trends, but with offsets of Algonquin shorelines probably attributable to errors from 120‑kilometre-long projections and 5 000‑year changes in uplift pattern. Of 24 radiocarbon dates compiled from the literature, 16 are on gyttja. Some of these incorporate old carbon error and require further testing with dates on terrestrial plant macrofossils. Available data remain sparse and require more basic mapping to improve ice-margin/shoreline correlations near the outlet area.
Résumé
À North Bay, l’étendue générale et le patron incliné des lignes de rivage du lac glaciaire Algonquin ont été établis par Spencer, Gilbert, Taylor, et Goldthwait au siècle dernier. À la moitié des années 1900, Chapman et Harrison ont observé que plusieurs rivages pointent vers l’est et proposent un lien avec les plans d’eau présents lors du retrait des glaces et à la baisse du niveau d’eau du lac Algonquin. Ce projet ajoute des données sur l’altitude des lignes de rivage à North Bay, avec 30 nouveaux points. Les rivages de Cedar Point, Payette, Sheguiandah et Korah sont identifiés; certains niveaux n’ont pas d’exutoire connu. L’inclinaison du rivage du lac Algonquin est d’environ 1,4 m par km. En comparant l’altitude des lignes de rivage du lac Nipissing et celles de Sudbury, les données de North Bay montrent des tendances similaires, mais le décalage des rivages du lac Algonquin est probablement associé aux erreurs de la projection sur 120 km et des changements de patrons survenus lors du soulèvement durant les derniers 5 000 ans. Sur les 24 dates au radiocarbone disponibles dans la littérature, 16 proviennent du gyttja. Certaines dates ont une erreur liée à l’âge du carbone et demandent une datation plus approfondie des macrofossiles végétaux terrestres. Les données disponibles sont floues et exigent une cartographie de base pour améliorer l’étude de la concordance entre les lignes de rivage et les marges glaciaires.
Parties annexes
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