Answer Happy

How many sedimentary sequences are shown in this crosssection?
10 loo 00 O O 4 00 O 00 0 00 0 O 0 5 00 O 0 00 00 O bo a O 0 O O 000 00 O 00 00 00 000 0 O O D 000 00 00 00 a 0 0 0 0 000 10 0 a O 0 0 O 00 0 0 0 0 U 00 0 0 OD 0 O 0 O 0 0 O O 00 0 O O 0 0 0 00 00 O 00 0 0 00 a 00 0 00 0 O 00 O 0 0 O O 0 00 00 0 O 13 0 0 00 0 0 0 00 O 0 100 00 1000 0 0 0 00 al 0 0 D 00 O 00 0 0 0 00 o o D 0 0 00 00 D O 0 0 0 0 0 0 0 0 0 000 00 O O 00 OD 00 00 00 00 0 O O 0 10 0 0 O O 09 O 0.0 O 00 0 0.00 0 O 00 0 0 00 O 00 0 0 0 a a 00 00 O 0 n 000 O 00 0 0 0 00 0 0 0 00 0 000 0 0 O 000 00 00 O O 00 000 00 00 ABA 00 00 O 0 O 00 00 00 0 D 0 0 00 a 00 00 0 4 00 3 2 1 00