CHAPTER XIV. 
THE PEEMO-CAEBONIFEEOUS SYSTEM— 
THE MIDDLE BOWEN FORMATION IN THE TYPE DISTRICT. 
The trapuean rocks lying on the Lower Formation have been covered by sedimentary 
rocks, and the sedimentary and igneous rocks have ThHctivEyTI t^ie 
horizontal position at the same time and m the same degree. J 
volcanic forUs must have been considerably diminished, as neither ^ ^ g 
Teds occur higher in the series. But that the volcanic activity did not cease for a long 
time is proved by the fact that molten rocks of the dolerite type were again a . „ 
iniected along lines of weakness in the sedimentary rocks. 
^ Lowing the right bank of the Bowen Eiver from Biralee Station upwards, 
after traversing^a basaltic plain for about three miles, a wall of white gritty 
runnin<^ N. 20“ W. to S. 20° E., crosses the path. This sandstone ^ ® 
the Middle Series. Its outcrop can be easily followed down the felsnatbio 
the -ndetoe, i. to .ve.die, .ppo-tl, Me l 
sandstone which, in its turn, rests on the surface of a bed of porphynte. i 1 
bo’th dip E. di- N. ». . low angle. This la the en rp ace ‘J' 
of the Middle Series is nnequivocallj mible. In other P'‘“ p 
Coral Creek, and the Bowen Eiver two miles above Beasley s (ruined) Fubl c 
the sedimentary and igneous rocks maybe observed in close juxtaposition ;bu h 
1 :f.:rfor belieriSg the» to be separated in these places bg a l.ne o »lMnd ‘bat 
neither the highest members of the one senes nor the lowest of the other are 
noiiits of junction. About three miles above the old crossing at Beasley s, a san 
bed JrossLthe Bowen Eiver, dipping at 35° to 8.W. This bed forms 
cliff known as “ The AV all,” which is traceable for miles to the south-east, Itis e d . 
tilted by tbe fault which divides the coalfield from the metamorphic rocks to the no 
Up to a point midway between the mouths of Eosella and Parrot Cre^s, 
Marine Isis occupies thefed of the Bowen Eir- >’ Hf p‘ 'UnlA 
dips of the strata, I estimated the total thickness at 1,848 feet. _ It ^ 
the Geological Map that the area occupied by the Middle Scries is „ t 
north-west end of the field than on the eastern side. This is accounted tor y 
comnarativelv high dip of the strata in the latter region. i , ^nd 
^ The hUddfe Series is made up of alternations of grey and yellow sandstones . 
blue and grey shales, with here and there bands of reddish ferruginous, P™bab^^f 
calcareous, sandstones, sometimes varying to impure sandy this 
coal (besides some carbonaceous beds hardly deserving the name of c , ) 
scries These seams have been named the Garrick and the Kennedy. ‘ 
“™Le be” mef with in . bo™ to be nfterwnrd. t.fetred to Ne„ the tep et 
series, black shales, highly impregnated with alum are abnn^nt. 
A few beds of conglomerate are met with, chiefly in the lower part of the 
The peMra™ generally of g»nit.. slate, schist, qnartsite, and other nretamerphic .» 
