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217<br />

those inferred from f~rIt Ir1iIins.<br />

The domirwJ:e of ulrabasinal rock fragmtms c!early places S300Sl0f'll:S uf !he<br />

Goose Tickle group .lId the lower Head Form:uion as Iype A arenitcs ofZulia (1991)<br />

which is consistent with the depositional selling irtrerred for these unils in chaprer J. The<br />

'mixed' provenance implied by !he dala on modal pcrcentag6 is also consistent wilh this<br />

depositional setting.<br />

Despite the large area over which samples were \.'OlIccled. pmogr.lphM.:illly tllllh<br />

!he Goose Tickle group and lower Head For.tUlion an: fairly homogeneow.<br />

This<br />

combined with the variable: rounding of grains iUggesu miling of the source m:loIeri:lls<br />

prior 10 supply of SC(Jiment to the main foreland basin ancJ tmx:h slope tuosin(s).<br />

II<br />

$CCms therefore. that pelrographic studies al Itis level of Iletail will not illluw tine It)<br />

distinguish whelher the Lower Head Fonnalion was depositcl.l in one or mure lhan nne<br />

basin.<br />

Cka.rly, the possibilily of I substamial sedimenlary or melasetlinoenllry .stlun:c:<br />

for these rocks requires funher invesligalion, as does the promincnl felsic allJ uhramaf.,;<br />

signature in tI'.e igneous fragmenu. In addilion, a link should be 3t1CfOp(ed bctwcc:n the<br />

Iypes of rock fngmcn[S idemified here, and the 'hinlerlan;j' area 10 the fordaoo twin<br />

These Iasks will be undertaken in chapl:er 6,

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