NEWFOUNDLAND APPALACHIANS 



205 



sandstone plus manganiferous shales and limestones, and about 1000 feet 

 of sandstone and shale in the Conception Bay area. In the Rencontre 

 East area of Fortune Bay, a section of Lower Cambrian or Proterozoic 

 rocks is composed of more than 6000 feet of conglomerate, sandstone, 

 arkose, limestone, and shale. So far, no volcanic rocks have been recog- 

 nized in the Cambrian in Newfoundland. 



In the Conception Bay area, it is interesting to note the occurrence of 

 a great volcanic series, the Avalon, that underlies the Cambrian. Within 

 the Avalon volcanic series at least three Precambrian epochs of sedi- 

 mentation and volcanism are recognized, and each was terminated by 

 folding, uplift, and erosion. The last disturbance probably preceded 

 the deposition of the Cambrian only a short time, and the whole of the 

 Avalon peninsula probably sank thereafter and was covered by the 

 Cambrian sediments. 



The fossils of all Cambrian sections have European affinities. 



Ordovician System 



The Ordovician strata of western Newfoundland consist of a lower 

 sequence of 6700 feet of sandstones, shales, limestones, and dolomites, 

 and an upper sequence, some 5000 to 10,000 feet thick, of dark and 

 variegated shales and sandstones with minor amounts of conglomerate, 

 arkose, and limestone. Some lava flows, agglomerate, and ash beds have 

 also been noted in the upper or Humber Arm series. These are the first 

 evidence of volcanism in western Newfoundland, and they were prob- 

 ably extruded near the close of the Ordovician. 



The two thick sequences are separated by a disturbance that involved 

 considerable faulting and erosion. The lower is massive and more compe- 

 tent; the upper is generally thin-bedded and incompetent. It is much dis- 

 torted in nearly all outcrops. The volcanics in the upper sequence 

 probably preceded ultramafic serpentine intrusions that penetrate the 

 beds extensively. 



The Ordovician in the Notre Dame Bay and in Fortune Bay areas is re- 

 plete with volcanics. The sequences are very thick and generally associ- 

 ated with elastics containing the impure varieties of sandstone — arkose 

 and graywacke. Only at the base of the Ordovician section, in the Fortune 





CANAOIAN 

 SHIELD 



COAST OF 

 LABRADOR 



WESTERN 

 NEW FOUNDLAN0 



NOTRE 0»ME 

 BAY AREA 



FORTUNE BAT AND 

 BURIN PENINSULA 



AVALON 

 PENINSULA 



_ 1 



z 

 -z. 



a 



A 





FOLDING, THRUSTING 



FAULTING 



FAULTING 



FAULTING 









BARACHOIS SER. 

 COWL, SS, SH. 

 COAL, 3,000' 







EROSION 



SHARP UPLIFT 



UPLIFT 



UPLIFT 



UPLIFT 





Z 



o 





EROSION 



CODROY SERIES « 

 CONGL , SS, SH, LS 

 GYPSUM 



ANGUILLE SER 

 CONGL , SS, SH 





SPRINGDALE GROUP 



RED CLASriCS, 



VOLCANICS 





EROSION 



z 

 < 

 z 



o 



> 



o 



a. 





SHARP UPLIFT 



DISTURBANCE 

 INTRUSIONS 



SHARP UPLIFT 



BATHOLITHIC 

 INTRUSIONS 



UPLIFT 



EROSION 



CLAM BANK SERIES 



COARSE CONGL, SS., 



1,700' 



? ? ? 



FOLDING, FAULTING 

 INTRUSIONS 



ORE AT BAY OE 



L'EAU CONGL 



3,000' 



9 



z 

 < 



K 

 in 



< 

 a. 



z 





SHARP UPLIFT 



FOLDING, EROSION f 



FOLDING, EROSION' 



SHARP UPLIFT 



EROSION 



? 



SILURIAN IN WHITE 

 BAY. CLASTIC, 2g00' 



SILURIAN IN NOTRE 



DAME BAT, CLASTIC 



2,000' 



RENCONTRE FM 

 OTZ, GRAYWACKE, 

 VOLCANICS, 



3J00' 



2 



ULTRABASIC 

 INTRUSIONS 



DISTURBANCE ? 



DISTURBANCE ? 



' 



z 



o 



> 

 O 



o 

 a 

 o 



1 



a 



? 



3 



a. 



3 



GREEN SS. 



% 



o 

 It 



* 



HUMBER ARM SERIES 

 WITH RED CLIFF VOL 



\ CROSS POND 

 VOLCANICS 



SNOOKS ARM VOLCAN 

 TABLE HEAD SERIES 

 SH 



LATE STCEORCE SER 

 SLATES, VOLCANICS 



MOORING COVE 

 VOLCANICS, 1,500' 

 ANDERSON COVE 

 SLATES 1,500 



BELL BAY 

 VOLCANICS 

 13.000'* 



POOLS COVE CONGL 

 5.000' 



WABANA SH. HEMA- 

 TITE 3.000' 

 BELL ISLE 6.000' 

 CLARENVILLE SH , SS 



DISTURBANCE 



BAY DEST LS. 

 2.000' 



z 

 < 



■ 

 2 

 < 



3 



< 



Z 



o 





? 



? 



LABRADOR SER. 

 SS,LS., 470' 



7 

 7 



DISTURBANCE AND 

 EROSION 



JOHANNIAN 500' 

 MANUELS SH. 300' 



HANFOROIAN SH . LS 



KELLIGRE WS SH 

 LONG POND SH 

 CHAM8ERLAINS BR SH 



EROSION 



LABRADOR SERIES 

 SS.LS.OTZ, 2.600' 



HANFOROIAN SH.. LS. 



EROSION 



EROSION 



BRIGUS CLASTICS 

 AND LS. 



ETCHEMINIAN SERIES 

 CONGL. SS.SH.LS, 200' 



o 

 o 



Q 



a. 



o 

 a. 



a 







UPLIFT, EROSION 



UPLIFT. EROSION 





FOLDING, INTRUSION 



FOLDING. INTRUSIONS 



z 

 o 



c 

 a 



, 



EROSION 



EROSION 



EROSION 



BAY O'ESPOIR 

 SERIES. I5.0OO' 

 GRAYWACKE. BASAL 



VOLCANICS 

 HARBOUR MAIN VOL- 

 CANICS OF BURI H ° 



AVALON VOLCANIC 

 SERIES I5.OO0' 

 TWO OROGENIES 

 WITHIN SERIES 



Fig. 13.2. Representative sections and crustal disturbances of Newfoundland. Compiled from 

 various reports mentioned in the text and with the aid of Daniel A. Bradley, University of 

 Michigan. The age of the folding, faulting and intrusions of the Notre Dame Bay area as in- 

 dicated between the Silurian and Mississippian beds is doubtful; they may be Acadian rather 

 than Caledonian. 



