... Mesoproterozoic. Here, we document an assemblage of organic-walled microfossils from the 1590–1270 Ma Dismal Lakes Group in Canada. The assemblage comprises 25 taxa, including 11 morphospecies identified as eukaryotes, a relatively high diversity for this period. We also report one new species, Dictyosphaera...

...Linda C. Kah; Julie K. Bartley; Tracy D. Frank; Timothy W. Lyons Abstract The Mesoproterozoic Dismal Lakes Group, arctic Canada, contains a relatively thin, yet regionally extensive stromatolitic reef complex that developed subtidally during a major transgression, shoaled to sea level...

...Robert J. Horodyski; J. Allan Donaldson; Charles Kerans Abstract An assemblage of filamentous microfossils is preserved in black shales of the approximately 1.2 Ga old Dismal Lakes Group from a locality about 110 km west-southwest of Coppermine, Northwest Territories, Canada. These microfossils...

...J. A. Donaldson; Gary Delaney Abstract Microfossils have been discovered in thin sections cut from a sample of black, laminated, nodular chert collected from the Neohelikian Dismal Lakes Group of the Dismal Lakes area, District of Mackenzie. Two distinct morphological forms are differentiated...

.... Stratigraphic redefinition of and structural relationships to the cover sequence of the intrusion provide the best available evidence for the age of the Muskox intrusion.Although previously inferred to be a pre-Dismal Lakes Group structure, the Canoe Lake Fault is here shown to cross-cut Dismal Lakes strata...

... data, suggest that the Dismal Lakes Group, which conformably overlies the Hornby Bay Group, was deposited during a period of more than 400 Ma. Given that the Dismal Lakes Group is a relatively thin, transgressive shallow platformal succession, this amount of time for deposition is interpreted...

...D.G. Cook; B.C. Maclean; K.C. Coflin Regional seismic data in the Colville Hills and Anderson Plains record up to 15 km of strata comprising five seismic-stratigraphic packages considered equivalents of 1) seismic basement; 2) Hornby Bay Group; 3) Dismal Lakes Group and Coppermine basalts; 4) Rae...

...R. H. Rainbird; W. J. Davis Abstract The c. 1.75 to 1.27 Ga Hornby Bay intracontinental basin, exposed in northwestern Canada, NE of Great Bear Lake, includes the Big Bear, Mountain Lake and Dismal Lakes groups. The Big Bear group comprises mainly immature clastic rocks deposited by high-energy...

... to 15 km, at or near the base of the seismic profiles. The age of the deformation is seen to be syn- and post- the deposition of the Dismal Lakes Group. It is also found that some Proterozoic-aged faults appear to have been reactivated during Phanerozoic deformation periods. The stratigraphy...

... coupled with drilling data and outcrop and potential-field observations show that the culminations are cored by ∼1.85 Ga crystalline rocks and include overlying sedimentary rocks of the ∼1.7-1.3 Ga Hornby Bay and Dismal Lakes Groups. Formation of the structures probably occurred along west-dipping thrust...

.... Forward orogeny structures were peneplaned and unconformably overlain by strata considered equivalent to the >1267 Ma Dismal Lakes Group. A comparable tectonic history is recorded in the exposed rocks of Coppermine Homocline to the east. Structural orientations indicate a general northwest–southeast...

... phases of deformation. The tentative Proterozoic stratigraphy (Hornby Bay Group, Dismal Lakes Group, and Coppermine basalts) can be mapped regionally but can be tied neither to outcrop nor good well control. It is the result of comparison of unconformities, structures and deformation phases mapped...

...Figure 2. Generalized stratigraphy and cross-section of the Dismal Lakes Group, modified from Kerans et al . (1981) . Lower, siliciclastic units are poorly exposed in the Coppermine Homocline, and likely overlie the Hornby Bay Group with significant disconformity ( Cook & MacLean, 1992...

... Huntsman Limestone of the Bulawayo greenstone belt, Zimbabwe; the 2.6 Ga Carawine Dolomite, Australia; the 1.90 Ga Rocknest Formation and the 1.8-1.2 Ga Dismal Lakes Group, Canada; the Ordovician Porterfield carbonate buildup, Virginia; and various Silurian carbonate buildups in the Midcontinent, United...