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,blc ^3-	Textural dwersiiy of fluvial deposits Minimum and ma.\iminn values of both grain size indices and abrasion a Younger Subatlantic point bar at Grabiny site					131 indices of
profil	7" Mz [03		Skt	*0	Wo	Oq
	— -2.1 -6.3	0.6-2.9	-0.6-0.5	0.6-2.4
Al	1.7-4.9	0.4 — 2.1	-0.2-0.7	1.0-2.9	630-960	1.8-4.3
A12	1.7-5.0	0.3-2.7	-0.3-0.6	0.9-3.4	800 - 940	2.4-3.5
Al3	0.2 —5.5	0.4-2.7	—0.2—0.5	0.7-3.1	770-950	2.2-4.0
ci	1.4—2.9	0.5-1.6	-0.1-0.5	0.9 — 2.6	830-960	2.1-3.2
C3	1.7-3.0	0.5-1.8	—0.2—0.5	1.0-3.6	870-980	2.4-3.0
C4 C5	0.8-3.6	0.5-1.4	—0.2—0.5	1.1-3.1	840-980	2.6-3.3

y,    V    IV III II I    @

Fig. 9. Podgrodzie site — schematic geological section across the alluvial fan deposit. Explanations

as in Figurę 4

was overloaded with suspended sediment. Identical properties do show the contemporaneous meandering river deposits at Drogomyśl in the upper Vistula valley.

In the successive profiles the abrasion index tends to increase slightly. The grains are better roundcd, and the rangę of the Wo values is smaller.

Podgrodzie — Only remnants of alluvial fan deposits (Fig. 9) dating from the Atlantic period are preserved there. These deposits are fining upward (Fig. 10). Their basal series is coarse-grained, and sandy strata showing a tabular cross-bedding predominate there. They are composed of medium, fine and very fine sand. Some strata include gravel traces (Fig. 10). Mz varies from 1.7 to 3.9 0. The highly variable sorting ranges from moderate (<r, = 0.8) to poor and very poor (<r, = 2.9).