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Oig1
0-4
Black (7.5YR2/0) unrubbed and rubbed, fibric materials (burnt) about 70% fiber; most remain consisting of roots; many charcoal fragments (irreversible drying); fine subangular blocky structure; hard, nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pinkish gray to pink (7.5YR7/2-4); extremely acid (field pH 4.0).
Oeg
4-15
Dark reddish brown (5YR3/2) unrubbed and rubbed, fibric materials about 50% fiber; most remain consisting of roots and woody fragments; massive; nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is light brown (7.5YR6/4); very strongly acid (field pH 4.5).
Oig2
15-30
Black (5YR2.5/1) unrubbed and rubbed, fibric materials about 70% fiber; most remain consisting of roots; massive; nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pink (7.5YR7/4); very strongly acid (field pH 4.5).
Oig3
30-90
Dark reddish brown (5YR2.5/2) unrubbed and rubbed, fibric materials about 50% fiber; most remain consisting of fine roots and easy to be rubbed; massive; nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pink (7.5YR8/4); very strongly acid (field pH 4.5).
Oig4
90-140
Dark reddish brown (5YR3/2) unrubbed and rubbed, fibric materials about 52% fiber; most remain consisting of fine roots, some as coarse as 2 cm partially decayed and easy to be rubbed; massive; nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pinkish white (7.5YR8/2); very strongly acid (field pH 4.5).
Oig5
140-200
Dark reddish brown (5YR2.5/2) unrubbed and rubbed, fibric materials about 68% fiber; most remain consisting of roots and wood fragments about 2-4 cm; massive; nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pinkish white (7.5YR8/2); very strongly acid (field pH 4.5).