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flO! clear (Knighl, 1985: Quinn, 1988a; Lindholm and Casey, 19891, and in fact
'Mainland sandstone' (Schillereff and Williams, 1979), a widely used name, had never
been formally proposed. The disriocrion belwten both of these units and the Norris Point
formation (Williams ct al., 198~) was also unclear. These problems have been rectified
by Quinn (in preparation) 35 discussed in chapler 1 alk! the simplified stratigraphic
nomenclature is shown in ellapter 2, figure 2.1.
152 Sandstone P!;![Qgraphy and Provenance SJudics - a Discussion
Sandstone petrography in western Newfoundland has been used for fWD purposes:
I. lh: distiIlClion belween superficially similar units in the Humber Arm Allochthon; and
2. the determinalion of provenance of Ordovician flySCh.
1be first general petrographic description of weslern Newfoundland saoostoO(S
was by Schuchen and Dunbar (1934) who noted thai sandslOnes of both the Ilumber Ann
and Long Point Series were arkosic and lithologkaJly similar. Slevens (] 970) lIdinc:d
a lower quanzo-feldspathk flysch (Cambrian) and an upper quanzo-ft:ldspalhjl; flysch
(Ordovician) in the Humber Ann Allochthon, reinforcing the idea that twn majur
sandstone units of rather similar aspecl exisl in western Newfoundland.
Gonzalez-
Bonorino (1979) C'l.rried OIlt petrographic slUdies of samples from selected sandslOl"ll:
localities in the northern. ~nlral, and soulhern pans of the Humber Arm Allochthon
The central localily seemed to be significantly different lithologically rrom Ihe others. but
Gonzalez-Bonor:no (1979) was unable to reach a conchl~ion as 10 11M: reason for lhe
varialion. Quinn (1985. 1986. 1988a), based on petfOt.' p1lk work in the central pan