scholarly journals Conodont Biostratigraphy and Constraints On Upper Devonian Mineral Deposits in the Earn Group, northern British Columbia

1989 ◽  
Author(s):  
S E B Irwin ◽  
M J Orchard
Keyword(s):  
British Columbia ◽  
Upper Devonian ◽  
Mineral Deposits ◽  
Conodont Biostratigraphy

Application of Apatite Fission-track Dating to the Study of Porphyry Type Mineral Deposits

1973 ◽  
Vol 10 (6) ◽  
pp. 846-851
Author(s):  
Peter A. Christopher
Keyword(s):  
British Columbia ◽  
Fission Track ◽  
Yukon Territory ◽  
Mineral Deposits ◽  
Fission Track Dating ◽  
Apatite Fission Track ◽  
Mountain Area ◽  
Thermal Event ◽  
Fission Track Ages ◽  
Apatite Fission Track Dating

Apatite fission-track ages for weakly altered rocks from the Syenite Range and Burwash Landing area of the Yukon Territory, and Cassiar area of British Columbia are shown to be consistent and generally concordant with K–Ar ages obtained on biotite from the same samples. More intensely altered rocks from Granisle Mine and the Copper Mountain area of British Columbia have discordant ages, due in part to alteration of apatite grains and, for samples from the Copper Mountain intrusions, to a Cretaceous (?) thermal event.

Upper Devonian (Frasnian–Famennian) conodont biostratigraphy in the subsurface of north-central Iowa and southeastern Nebraska

1989 ◽  
Vol 63 (4) ◽  
pp. 503-524 ◽  
Author(s):  
Ronald A. Metzger
Keyword(s):  
Upper Devonian ◽  
North Central ◽  
Conodont Biostratigraphy

The Upper Devonian–Lower Mississippian sequence in the subsurface of north-central Iowa and southeastern Nebraska consists of the Lime Creek, undifferentiated Sheffield–Maple Mill, English River, Prospect Hill, and Chapin Formations. The Lime Creek is restricted entirely to the Polygnathus biofacies where conodonts are present and correlates with an interval from Zone 4b to Faunal Interval 8 of the Canadian (Alberta) Rockies zonation based on conodonts and foraminifers. The oldest identifiable Famennian units range in age from the crepida–rhomboidea Zones at locality 1 to the Upper marginifera Zone or younger at localities 2 and 3. The youngest Devonian strata may occur in the Upper expansa Zone at locality 1 and Middle expansa Zone at localities 2 and 3. Famennian faunas are present in the Polygnathus biofacies at localities 1 and 3 and in the Icriodus biofacies at locality 2. A total of 50 species and subspecies are identified, four of which have not been previously described (Icriodus sp. A, Hemilistrona sp. A, Polygnathus depressus n. sp., and Polygnathus sp. B).

scholarly journals The Upper Devonian Palliser Formation, Rocky Mountains, British Columbia and Alberta: Geochemistry and General Geology

1986 ◽  
Author(s):  
H Geldsetzer ◽  
G de Mille ◽  
D F Sangster ◽  
C F Chung ◽  
J A McDonald ◽  
...  
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Upper Devonian ◽  
General Geology
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