SEKURAU ANTICLINAL 
(Southern part) 
Miopliocene. 
Old Miocene, 
in normal fa- 
tes _coal- 
bearing. 
Oldest Mio- 
cene, ? Oligo- 
Cene, (coal- 
free). 
Sands, 
clays. 
Coral limestone. 
Sands, gravel, 
clays, brown to 
black coal. 
Shales, sandsto- 
nes, black glance 
coal (anthracite), 
separate strata of 
coralligene, Lepi- 
docyclinic lime- 
stones. 
Shales, traces of | 
sandstones and | 
limestones. 
gravel, | Sands, 
SEKURAU ANTICL. SEKURAU ANTICL. 
(Eastern part) 
clays. 
| A 
Coral limestones 
and marls with | 
traces of coal. 
gravel, | 
| 
| 
(Northern part) 
Shales, sand- 
rocks, separate 
strata of coralli- 
gene, Lepidocy- 
clinic limestone. 
Shales, traces of 
sandstones. 
SEMBURU ANTICL. | 
Sands, 
| clays 
Sampajau marls. 
Limestones, san- 
dy and gravelly 
Biotite tufas. 
Globigerina marls, 
traces of lime- 
rock and Sam- 
pajau marls, finely 
strated clayey 
sands. 
Shales, 
stones, traces 
of coal. Lime- 
stone banks with | 
Corals and Lepi- 
docyclinae, finely 
strated, clayey 
sands, traces of | 
Globigerina marls 
on the upper | 
parts. 
MALUWI ANTICL. 
(Northern part) 
gravel, | Coral limestones | Sands, 
Sampajau marls 
with Globigerinae 
and Biotite tufas. 
Globigerina marls. 
trages of sand 
| and glance coal | 
(anthracite). 
MALUWI ANTICL. 
(Southern part) | 
gravel, 
| clays. 
Coral limestone. 
Biotite tufas. 
Globigerina marls 
sand- | Globigerina marls, Globigerina marls, 
trages of sand. 
SAMPAJU ANTICL. 
Sands, gravel, 
clays, brown to 
dead black coal, 
in the North tra- 
ces of Sampajau 
marls. 
Shales, sandsto- 
nes, traces of 
coal and lime- 
stone, 
Batu Hipup 
ANTICLAL 
Sands, gravels, 
clays, brown coal 
(lignite). 
Sampajau marls, 
limestones. 
GG. BATU ANTICL. 
(Western limb) 
clays, brown coal 
Sampajau marls, 
Ga. BATU ANTICL. 
(Eastern limb) 
Sands. gravels. 
Sampajau marls, 
limestone, sands, 
clays, clayey 
sands. 
