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sandsfOw should be allempted to try 10 place constraints on the liming of dc:positlon,
and hence the evolution orlhis most easterly preserved part of llle foredeep basin. Ifillis
interpretation is correct, the model for the forelaRd basin in this area would be similar
to B (in figure 7.2) in Ihe case of the Hare Bay area and the Northwest Arm Formation.
whereas Ihe situation in the Humber Arm Allochthon area would be similar \u D.
7 J 1 1 CornpariWD Wilh Quebec Segment of rbe EorChnd !l:lsjn
A comparison of lhe Lower Head formation with the Tourel1e Formation. which
is a similar unh of similar age to the Lower Head Formation in the Quebec Appalachians
(HiSCQII, 1978) shows that while the Tourelle Formation resembles lhe Lower Head
Formation in many respects. conglomeratic facies are not as abundanl, indiCilling that the
basin margin was OOt cannibalised 10 the same e"'tenl.
The relationship between the ToureHe Formation and the Cloridorme Formation
differs in another important Wl.y in thai !here is a much larger time gap between
deposition in the Tourelle (Arenig) trench slope basin (Hiscon et aL. 19K61 ant! the
foredeep basin which is represented by Ihe Cloridorme Formalion (Caradoc). The time
gap is much less between the Lower Head Formation (Arenig - Llanvirn) and the Goose
Tickle Group (Llanvirn - '?L1andeilo).
In addition. the eastern slope to the Newfoundland segment of the fnredeep ba.,in
appears to have been steeper than that in Quebec, as evidenced by slumping, gravity
flows and the absence of megaturbidites.