56 THE HAWKESBURY SANDSTONE. 
Between these then are finer lines of stratification which at — 
mostly inclined to the horizon. They are irregular in thicknes — 
and in dip: sometimes composed of coarse sand and sometimes of 
the very finest dust. They are occasionally interrupted by belts 
of small pebbles, always abraded and often rounded, but through 
the whole mass of the sandstone of the Blue Mountains the stout 
is exceedingly fine-grained, and there are rarely any pebbles large 
than a pea except in the very lowest conglomerates. None of 
finer strata extend from one great subdivision into another. The 
irregularity of the dip of the false bedding is surprising. Inafey 
feet the dip will vary in almost every direction and angle, though | 
rarely at a greater one than 25 degrees. I have noticed also 
In order 0 
prevent confusion by the frequent use of the word strata, I shall | 
call the greater divisions of the horizontal sandstone “layers and 
the smaller stratification “lamine.” Between the layers there 
often a shale or slate deposit, the laminz of which are thin, hot 
zontal, and rather difficult to trace. the 
The ferruginous bands do not always follow the linea ) 
layers or the lamine-—they frequently descend irregularly Wit ° 
the stone in undulating lines or circles, in fact, m _ 
shape. They are in this case no more than stains, nee oom : 
bsequently. When examined by the aid of the micro 
tone is seen to be a mass of grains of sand cemented oxide : 
by a limonite paste, so that the actual amount of ferne hich DO 
small. But there are also broad bands of red stone oeut 
cuttings of the second Zigzag. It is about 3 feet thick ee 
but very irregular and undulating, with sandstone 
bed of shale, which I make no doubt it has been. The 
the vegetable remains has been effected in oxydizing ©” 
shall explain hereafter. mite 
been made to the plant impressions in this forme d 
formation whence derived is not stated. Thinnfeldia ' ‘e pal 
roides has been found near Mount Victoria. There 7° ° 
lenticular masses of coal, or rather jet, in some 
