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6 Z 4 Qldq PUJlllochtboOO!I$ S3!JlhmllQ
POlenuaJ sour.::a of silicidulic sediment in the panulochthon lie below the
plalfonn carboNItes...lid are rt'lated 10 rifting and the early phases of development of the
passive lTW&in. 1lIey include the Bradore. B.ateau and Hawke's Bay Formations, along
with the volcanic Lit;hthouse Cu\'C Formation. Tbe bulk of the siliciclastic detritus in
the PM3uwehthOnoU5 sequence was probably derived from Grenville basement.
None
of It,e sediment supply routei described above appear likely 10 have penetrated on a
regional scale througllihe carbonate platform to Ihe underlying siliciclastics. and thus
paraulochtbonous siliciclastic units are unlikely [0 have been exposed to provide extensive
detritus 10 the Lower Ilead Formation and Goose Tickle group. In addition. the
inlcrpretaIion of the Lower Head Formation as a trench slope basin localed on the east
side of the foredeep twin (see chapter 3) makes il unlike.J lhat sediment from the
weslern margin could have pcnetr.ltcd inro its area of deposition.
An ill\'C'Stigalion into the makeup of Cambrian paraUiochthooous siliciclastics is.
hov,'e\'er. rele\-ant. as related rocks may have prO\lided deuilus which was subsequently
recycled inlD the lower Head Formation and Goose rlCkle group. The main
paraulochlhonous Camhri3n saodSlOflC units are briefly dcscrib:d hclnw.
6 'l 4 I Bradore formaljon
The Bradore FormatiDn is a Cambrian unit which unconformably overlies
Grenvillian crysl4tlline basemenl (Williams and Stevens, 1969; Hiscoll et aI., 1984). [I
consists of coarse conglomerales. pink subarkosic sandstones, and white quantiles