24 
1^]. Di5 C. (4 ^ARIvE and C. 
PRIORI tile air it can be s: eii tiiat the characleristii' X.\V.~S.Pb jointing' 
becomes less conspicuor.s a short bistancc' S.K. ol‘ Mt. Curioiis and still 
higher upstream is com})letely leplaced by a system ol' ])roininent Ph-A\ . 
joints which becomes more, and more marked towards the boundary of the 
sandstoiH' ar(‘a near liardabut Pool. 
The overlying' softer rocks are exposed along an escarpment about two 
to t'oui' mih^s north-west of the river. They undei'lie the [ilaiii to the north 
probably as far as Shark Pay. Along the eseai'pmentj gullying is active 
almost ev('rywher(‘, am; on the whole the esi'ai'pment is jirobably receding 
at a fairly ratiid rale. That this uiiiier sm’ies once extended across the river 
towards the south is shown l)y the occurnuice of these rucks at i\leaiiarra 
JLill Avhicli forms an erosion nmmant abont four miles south of the river 
(text hg. 5). 
The escarpment on tlu' north side appioaclu^s tlu' sea coast about five 
miles north of the mouth of the iMiu’chisou Kiver, where it turns in a direc- 
tion mor(‘ or less parallel with the coast. The ( istance between the toj) of 
the escardment and the shore is at lirst a mile or so, but diminishes graduall.y 
until, north of Nimgajay Spring, it is not more' than aliout 500 yards. Ex- 
posures idmig the coast arc exceedingly ];oor oAving to a covering of slipped 
durii-rust on tin* slo| es. There aio clialk ex])osiires in a few places, Imt 
the nature of the nvm’lying and underlying beds can rarely he ascertained. 
Text Fig. 2. 
V\q\v across lower part f)f Second Onlly from slope below Alingca 
lk)int. Tower shelf is Tiimblagonda Sandstoni' partly covered Avith 
loose sand, probably disintegregrated Butte Sandstone. In the 
distance is the scarp of the upper part of the .Aturchison House Scries 
(Alinga Beds to Second Gxdly Shale). (Traced from ])hotographs.) 
HI. (’KP]TACE()PS STHATIGKAPHY. 
(Murchison House Serii's.) 
1. (Ikxkuau. 
'I he name Murchison House Scrii’s is her(' projnised for the succession 
of sedimentary rocks which octuirs on botli sides of the IMurchison Uiver 
from the coast of the Indian Oc('an eastAvnrds to at least a foAV miU*s east 
of tile tel(‘gra|)h line i.i*. for a distance of aliout 18 miles. The eastern 
boundary of the ontcro)) area of this series has not yet lieen determinech 
Southwards the sediments disa[)pear a short distance from the river under 
a cover of loose sand, but outcrops exist along the coast at least as far 
as Bluit Point (text hg. (i) and very probably they contiiuu' still I’arther 
to the south. North of lln^ ri\'er the sediments likewise are covered hy sand, 
but, along tlie coast, outcrops Avere observ<'d to a point ten miles north of 
the mouth of the ri\erand th(w seem to extend consid(*ral)ly farther north. 
All good outcrops of the series and ai! sections studied liy us occur on 
Murcliison House Station. 
