University of Waterloo Radiocarbon Dates I

Berry, Jeanne C; Drimmie, R.J.

doi:10.1017/s0033822200004914

Cited by 5 publications

(1 citation statement)

References 11 publications

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“…7B) and the conversion of sample depths to ages, sedimentation rates have been calculated using the three dates from peats 1 and 2 in core 6 ( Fig. 4; 1520 + 60 BP (Beta 29897)); and a date of 4840 + 360 BP (WAT 300; Berry and Drimmie 1982) obtained on wood chips overlying glaciolacustrine clay at an elevation of approximately 71.5 m near Bells Island (Fig. 4; 1520 + 60 BP (Beta 29897)); and a date of 4840 + 360 BP (WAT 300; Berry and Drimmie 1982) obtained on wood chips overlying glaciolacustrine clay at an elevation of approximately 71.5 m near Bells Island (Fig.…”

Section: Interpretation and Lake-level Curvementioning

confidence: 99%

Water-level fluctuations in Lake Ontario over the last 4000 years as recorded in the Cataraqui River lagoon, Kingston, Ontario

Dalrymple¹,

Carey²

1990

Can. J. Earth Sci.

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The modem sediments in the Cataraqui River lagoon and marsh (Kingston, Ontario) consist of mixtures of organic material and clayey silts, the organic content of which increases as water depth decreases; gyttjas are accumulating in the deeper water parts of the lagoon, whereas peat is the dominant sediment in the very shallow water portion of the lagoon (<0.7 m) and in the adjacent marsh. Cores show that one partial (modem) and two complete depositional cycles (gyttja passing upwards into peat) have formed within the last 4000 years. The contact between cycles (gyttja over peat) is abrupt. These cycles are interpreted as resulting from fluctuations in the level of Lake Ontario about the long-term rising trend. Radiocarbon dates show that relatively low levels prevailed from 4100 to 3300 BP and from 2300 to 1900 BP; rapid rises in water level, which are indicated by the abrupt contact between cycles, occurred at 3300-3100 BP and some time between 2000 and 1500 BP. These water-level changes are synchronous with those shown by other studies in Lake Ontario and with century-scale paleoclimatic events. The high stands correlate with wet periods, and perhaps also with warm periods in the eastern part of the Great Lakes basin, but an inverse relationship between precipitation and temperature in the western Great Lakes suggests that the Great Lakes basin does not respond uniformly to climatic changes.Les sCdiments rCcents d'un Ctang et d'un marais en bordure de la rivii.re Cataraqui (Kingston, Ontario) sont formCs de mClanges de matikre organique et de limons argileux, dont la composante organique augmente avec la rkduction en Cpaisseur de la tranche d'eau; les gyttjas s'accumulent dans les zones d'eau plus profondes de I'Ctang, tandis que la tourbe domine dans les zones de plus faible Cpaisseur d'eau (<0,7 m) et dans le marais adjacent. Les carottes de forage rCvklent que durant les derniers 4000 ans il y a eu un cycle partiel (rkcent) et deux cycles complets de dCpBt (le gyttja cCdant la place B la tourbe vers le haut). Le contact entre les cycles (gyttja reposant sur tourbe) est net. Ces cycles sont interprCtCs comme Ctant le rCsultat des fluctuations du niveau du lac Ontario durant sa longue phiode de remplissage. Les dates au radiocarbone indiquent que les niveaux relativement bas dominaient entre 4100 et 3300 BP et entre 2300 et 1900 BP; des ClCvations rapides du niveau de l'eau, rCvClCes par le contact abrupt entre les cycles, sont apparues il y a 3300-3100 ans BP et aussi entre 2000 et 1500 ans BP. Ces variations du niveau de l'eau correspondent dans le temps 5 celles reconnues dans d'autres Ctudes sur le lac Ontario, et aussi aux CvCnements palCoclimatiques identifiCs a 1'Cchelle sCculaire. Les niveaux ClevCs correspondent a des pCriodes trks humides, et possiblement aux pCriodes chaudes dans la partie orientale du bassin des Grands lacs, mais une relation de rCciprocitC entre la prkcipitation et la tempCrature dans la partie occidentale des Grands lacs suggkre que le bassin des Grands lacs ne rCpond pas uniformC...

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Section: Interpretation and Lake-level Curvementioning

confidence: 99%