. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 898 EMILIANI AND FLINT [chap. 34 Time-strati- grophic units (Zagwijn, 1957) (?) Elsterion Cromerian Menaplon Waalion Eburonian Tiglian Pre-Tiglian CLIMAT NETHERLANDS. Fig. 1. Pleistocene temperature fluctuations inferred from pollen data. Left: Fluctuations between late Pliocene and early middle Pleistocene time, estimated from pollen content in strata in Netherlands (Zagwijn, 1957, p. 240). Right: Fluctuations between earliest (?) Pleistocene and middle Pleistocene time, estimated from pollen content of two core
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 898 EMILIANI AND FLINT [chap. 34 Time-strati- grophic units (Zagwijn, 1957) (?) Elsterion Cromerian Menaplon Waalion Eburonian Tiglian Pre-Tiglian CLIMAT NETHERLANDS. Fig. 1. Pleistocene temperature fluctuations inferred from pollen data. Left: Fluctuations between late Pliocene and early middle Pleistocene time, estimated from pollen content in strata in Netherlands (Zagwijn, 1957, p. 240). Right: Fluctuations between earliest (?) Pleistocene and middle Pleistocene time, estimated from pollen content of two cores from points 500 m apart in a single lacustrine sequence near Leffe, Italy (From an unpublished version, kindly furnished by Fausto Lona, of the curves in Lona, 1950. p. 169; Lona and Follieri, 1957, p. 93.) The Leffe curves were fitted by R. F. Flint to the Netherlands curve by correlatmg the temperature minima as suggested by Zagwijn (1957, p. 243), who first noticed the similarities. The parts of the Leffe curves between those minima were fitted to the intervening spaces by proportional reduction. Columnar sections show character of sediments: black = peat and lignite; shading = inorganic sediments, chiefly marl and clay. The vertical scale is not time calibrated in either curve; hence variations in local rates of sedimentation are not compensated for. The troughs and peaks are significant for relative amplitude only. succession of fluctuations, but as neither column is time-calibrated, spacing of the peaks and troughs of the curves is dependent on rate of sedimentation at each locality, so that curve slopes cannot be compared. Besides these three sequences there are two paleobotanical sequences in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscie
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