270 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 192 8 



Table II.— Geological relations between Newfoundland and Ireland 



NEWFOUNDLAND 



Nature of Paleozoic sediments and strike 

 of St. Lawrence geosyncline call for a 

 land of great area on northwest. 

 This trough does not strike into Ire- 

 land, but does go through northwest 

 Scotland. 



The New Brunswick east-west geanti- 

 cline separates the northern St. 

 Lawrence geosyncline from the south- 

 ern Acadian one. 



Acadian geosyncline has from time to 

 time slight faunal connections with 

 Great Britain. 



Strike of St. Lawrence geosyncline 

 slightly northeast. 



Strike of Appalachides northeast. 



Archeozoic of very wide surficial distri- 

 bution, mainly granites. 



Anorthosites the characteristic igneous 

 rocks. 



Proterozoic detritals of southeast in 

 northeast-southwest troughs. 



Lower Cambrian in two geosynclines 

 separated by New Brunswick geanti- 

 cline. St. Lawrence trough has 

 Lower and Upper Cambrian. Aca- 

 dian trough has Lower and Middle 

 Cambrian, with European faunal 

 similarities. 



Middle Cambrian in Acadian trough. 

 Decided faunal connections with 

 northwest Europe. 



Upper Cambrian-Ozarkian Is. in both 

 basins. Little understood. 



Lower Ordovician Is. in great develop- 

 ment in St. Lawrence geosyncline. 

 Faunal connections with northwest 

 Scotland. Detrital facies of Acadian 

 geosyncline in great development, 

 with Welsh faunal similarities. 



Middle Ordovician (Chazy) Is. in 

 marked development in St. Lawrence 

 trough. None in Acadian trough. 



Tectonic movement. (?) Block faulting. 



Middle Ordovician (Black River- Tren- 

 ton) in vast detrital development in 

 northwest. No volcanics. Fauna 

 limited. 



Nature of Paleozoic sediments and strike 

 of Caledonian geosyncline call for a 

 land of great area on west and north- 

 west. A view held by all since its 

 presentation by Hull. This land 

 can not be Newfoundland with its 

 separate marine history. 



Absent. 



Absent, unless connections are made 

 with the Armorican geosyncline; fau- 

 nal similarities then slight. 



Strike of Caledonides northeast, but 

 considerably less than in Newfound- 

 land. 



Strike of Hercynides east. 



Archeozoic not definitely known. 



None in Great Britain. 



Proterozoic in Dalradian detritals that 

 connect with Torridonian of Scot- 

 land. 



Cambrian. (?) Limited, poorly under- 

 stood, restricted on southeast. No 

 diagnostic fossils, age not proved. 

 No comparisons possible with New- 

 foundland. 



Unknown. 



Unknown. 



Correlates with Tremadoc and Arenig 

 elastics, but both are unknown in Ire- 

 land. 



Llandeilo in southeast, detritals and 

 volcanics. No American faunal con- 

 nections other than graptolites. 



Bala of southeast and elsewhere in vast- 

 development of detritals and vol- 

 canics. Ends in 9,000 feet of con- 

 tinental deposits. No American 

 faunal connections other than 

 graptolites. 



