U.S. Geological Survey Radiocarbon Dates IX

Ives, Patricia C; Levin, Betsy; Oman, C.L.; Rubin, Meyer

doi:10.1017/s0033822200000709

Cited by 36 publications

(12 citation statements)

References 21 publications

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“…During the St. Croix phase this lobe moved southwestward to the St. Croix moraine in the Minneapolis lowland. Its minimum age is provided by a radiocarbon date of 14,690 ± 390 (W-1763) (Ives et al 1967) from the base of the sediments at Weber Lake (Fries 1962). A subsequent event in the history of the lobe is marked by the Vermilion moraine a little south of Lake of the Clouds, for which no date is available.…”

Section: Topography and Geologymentioning

confidence: 99%

Pollen Influx to Laminated Sediments: A Pollen Diagram from Northeastern Minnesota

Craig

1972

Ecology

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A pollen diagram is presented from Lake of the Clouds, Lake County, Minnesota, in the Boundary Waters Canoe Area. Of the 5.6 m of sediment analyzed, almost 5 m are laminated. The 9,349 laminations counted, composed of alternating dark organic and light layers, are annual varves which provide a time scale for study of vegetational history and calculation of pollen influx.The pollen concentration in each sample was determined by a technique involving the addition of microspheres. The pollen influx was calculated from the pollen concentration and varve count. Pollen concentration was very low in the herb pollen zone of late-glacial time. During postglacial time the pollen influx was generally 2-4 X 104 grains cm-2 year-1.The pollen diagram has been divided into six zones. Zone 1 records tundra-like vegetation; most of the pollen rain, which was sparse, was probably blown in from a great distance. Zone 2 records spruce forest, with some pine and thermophilous deciduous trees, succeeded in zone 3 about 9,200 years ago by forests dominated by jack or red pine or both. With the start of zone 4, dated about 8,300 years ago, alder migrated into the area, followed about 7,000 years ago by white pine, concurrently with the maximum eastward extension of prairie in the state. In the period represented by zone 5, commencing about 6,500 years ago, white pine was very important, spruce was at a minimum, and the climate was probably relatively dry. Environmental changes brought about increases of spruce and cedar and a decline of pine in zone 6, commencing about 3,000 years ago. The diagram is truncated at 200 years or more before the present.

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Section: Topography and Geologymentioning

confidence: 99%

Pollen Influx to Laminated Sediments: A Pollen Diagram from Northeastern Minnesota

Craig

1972

Ecology

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“…1, Hedeen, 2008). The history of paleontological discoveries at the site dates back to the early 1700s (Schultz et al, 1963;Levin et al, 1965;Ives et al, 1967;Tankersley, 1990Tankersley, , 1996Tankersley, , 2002Hedeen, 2008). Yet, despite the historical and paleontological importance of BBL, comprehensive Quaternary research has not been previously conducted at this locality.…”

Section: Introductionmentioning

confidence: 99%

Quaternary chronostratigraphy and stable isotope paleoecology of Big Bone Lick, Kentucky, USA

et al. 2015

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Big Bone Lick (BBL) in northern Kentucky, USA has been a critical geologic site in the historical development of North American Quaternary vertebrate paleontology since the 1700s. Sedimentology, geoarcheology, paleontology, accelerator mass spectrometry radiocarbon and optically stimulated luminescence dating, and stable carbon and nitrogen isotope analyses were undertaken to develop a chronostratigraphy and history of erosion and deposition for the site to provide a foundation for understanding taphonomy, and species extinction and adaptation to periods of climatic and environmental change. Three geomorphic surfaces are recognized at BBL representing significant periods of floodplain aggradation since the last glacial maximum (26.5-19 ka) dating to the Oldest Dryas (Tazewell, 25-19 ka), the Older Dryas (Cary, 14-12 ka), and late Holocene (5 ka to the present). Unconformities suggest significant periods of degradation during the transitions from cold and dry to warm and moist climates from the Oldest Dryas (Tazewell) to Bølling Oscillation, from the Older Dryas (Cary) to the Allerød, and from the Younger Dryas (Valders) to the Holocene Climatic Optimum. Increased anthropogenic activities since~5 ka may have increased soil upland erosion and floodplain aggradation. Stable isotopes demonstrate that the landscape has been dominated by C 3 vegetation since the last glacial maximum.

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“…al., 1973 Black, 1976 Black, 1976 Black, 1975 Black, 1974 Buckley and Willis, 1970Colinvaux, 1981Crane and Griffin, 1961 Detterman and Reed, 1973 Detterman, et. al., 1965Everett, 1971 Feulner and Schupp, 1964 Card, 1980Heusser, 1973Heusser, 1963Ives, et. al., 1967Kulp, et.…”

mentioning

confidence: 99%

“…al., 1983Heusser, 1983 Heussep, 1959 Heussep, 1958Hubbs and Bien, 1967Hubbs, et. al., 1965Ives, et. al., 1967Ives, et.…”

mentioning

confidence: 99%

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Bibliography of published radiocarbon dates for Alaska

Galloway¹

1984

Open-File Report

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U.S. Geological Survey Radiocarbon Dates IX

Cited by 36 publications

References 21 publications

Pollen Influx to Laminated Sediments: A Pollen Diagram from Northeastern Minnesota

Pollen Influx to Laminated Sediments: A Pollen Diagram from Northeastern Minnesota

Quaternary chronostratigraphy and stable isotope paleoecology of Big Bone Lick, Kentucky, USA

Bibliography of published radiocarbon dates for Alaska

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