Birds (Prehistoric Life) by Megan Lappi

By Megan Lappi

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High concentrations of Ti, Cr, Pb, Ni, Cu and Zn in the C1 and C2 horizons seem mainly influenced by the mineralogical composition of the parent rock. 20 ~tg/g) represents an increase to values 10 times higher than those observed in the saprolite. 83) exists between Hg and aqua-regia-soluble A1 in both weathering profiles (Fig. 17), while almost no correlation between Hg and Fe exists (Fig. 14). e 0 5 10 15 0 5 A! 17 Correlation between Hg and aqua-regia-soluble A1 in both weathering profiles and between aqua-regia-soluble A1 and AI (XRF) in lake sediments.

Grain-size distribution illustrates the general dominance of the <20 ~am fraction (75%) accompanied by smaller amounts of both the 20-63 lain fraction (18%) and the >63 lam fraction (7%). However, contrasting patterns were observed in some layers characterized by silty-sandy sediments, which are concentrated in the upper zone IV (Fig. 2). Between depths of 40 and 80 cm, the occurrence of sandy materials was grouped into zone IVA. 9%. Mineralogical composition reflects environmental changes towards lacustrine sedimentation and more reducing conditions.

C r (pglg) 100 0 Ti (%) 1200 ~ 17n ~ ~ 300 ~ = i ~ ~=- , 39o ; "== i ~ --- ~-- 420 ~' ~ ~ ~ P-"--' 480 ~. ~ ! , 550 ~" ~ ~ 1,5 ..... ~ , ~ ............ ~ ---J A oE~0 6T0 " " 700 ," J~ 740 ~' =,, m m m m i 77o; u ~800~ 830 b, 8~o ~ , i ~ i ~ ' ' m B i J 930 " 1140 i ' m m 1230 . . . . 4 Summary diagram of chemical stratigraphy and grain size >20 Hm. Paleoenvironmental zones I to IVA as described in the text'. ,. Pollen Diagram @ o,o,o,o,o,ooot°,),,o . . . 320 ~::z,m ~ : Fe(%) Mn (pg/g) Hg (pg/g) C(org) ,20pm(%) ,ooo "°ZTI~ 20 0 i "='=" 2200 0 i ~" 0,5 " L~TLml ' ..............

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