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Geology; August 1994; v. 22; no. 8; p. 755-758; DOI: 10.1130/0091-7613(1994)022<0755:CACILC>2.3.CO;2
© 1994 Geological Society of America
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Calcrete and coal in late Carboniferous cyclothems of Nova Scotia, Canada: Climate and sea-level changes linked

S. K. Tandon1 and M. R. Gibling2

1 Department of Geology, University of Delhi, Delhi 110007, India
2 Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada

Modern tropical peats require continuity of precipitation for accumulation, whereas calcretes and calcic vertisols require strongly seasonal conditions. The 20-30-m-thick cyclothems of the Sydney basin, Nova Scotia, Canada, show a systematic alternation of coals and other hydromorphic paleosols with calcretes and calcic vertisols. This implies strong variation in seasonality during the duration of a cyclothem, estimated at 200 ka. In at least one cyclothem, calcic paleosols formed on an interfluve adjacent to a paleovalley cut through marine strata, suggesting that a more seasonal and probably drier climate prevailed during sea-level lowstand. The calcic paleosols are estimated to have formed during periods of 104 yr, possibly indicative of partial control by obliquity and precessional cycles.




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