Floor or roof

Rock

Thickness (m)

Lithologic character

Upper roof

Fine sandstone

9.25

Grey or dark grey; mainly feldspar and quartz; compact

Immediate roof

Mudstone

2.33

Dark grey; slightly silty; with abundant plant fossils

Coal seam 10

3.2

Black; fragmental; showing glassy luster; mainly dull and bright coal

Immediate floor

Mudstone

2.00

Dark grey ~ ash black; in bulks; containing fragments of plant fossils

Hard floor

Fine sandstone

8.90

Grey; fine-grained; mainly composed of quartz and feldspar