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Field guide - IUGS

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42<br />

7,5-7,69 - gyttja dark brown, weakly<br />

laminated.<br />

7,69-7,86 - dark brown to black laminated<br />

muddy gyttja.<br />

7,86-7,97 - brown laminated muddy gyttja.<br />

7,97-8,15 - laminated mud interrupted by a<br />

1 cm thick, organic-rich layer, in interval 8.07-8.08<br />

– shell fragments.<br />

8,15-8,46 - laminated mud with shell<br />

fragments.<br />

8,46-9,0 - mud weakly laminated.<br />

9,00-9,37 - massive mud.<br />

9,37-10,9 - dark green weakly laminated<br />

mud with more light impurities and shell<br />

fragments.<br />

10,9 -11,27 - dark green massive mud with<br />

muddy “concretions” more light colour.<br />

11,27-11,86 - dark green weakly laminated<br />

mud with more light impurities and shell fragments.<br />

11,86-12,28 - dark green massive mud with<br />

muddy “concretions” more light colour and rich<br />

shell fragments.<br />

12,28-12,75 - dark green weakly laminated<br />

mud with more light impurities and shell fragments.<br />

12,75-12,77 - brown layer of mud and<br />

organic material (organic material ~25%).<br />

12,77-13,53 - interbedding of mud and<br />

organic material (ratio of mud and organic material<br />

~55:45%).<br />

13,53-13,82 - blue laminated clay (varve<br />

clay).<br />

13,82-14,47 - sand laminated.<br />

Fig. 3.10. Bottom-sediments litothostratigraphy of Umba area, lake3 with threshold of 30 m<br />

a.s.l (Fig. 3.8).

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