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microfossils of unknown affinity or age

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Journal Article
Published: 01 July 2012
Journal of Micropalaeontology (2012) 31 (2): 139-158.
... in future years to monitor the fate of these unique plankton assemblages and to determine variation in northward distribution and possible penetration into the polar basin. The fate of this tropical fauna (persistence, disappearance, or genetic intermingling with existing taxa) is presently unknown...
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Journal Article
Published: 19 January 2010
Canadian Journal of Earth Sciences (2010) 47 (1): 53-73.
...Luke P. Beranek; James K. Mortensen; Michael J. Orchard; Thomas Ullrich Abstract New detrital mineral age and whole-rock geochemical data provide the first constraints on the composition and source of North American Triassic strata in the northern Canadian Cordillera. Conodont-bearing Triassic...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2015
GSA Bulletin (2015) 127 (5-6): 702-736.
... sampled along the conjugate Baja California and Nayarit-Sinaloa rift margins, as well as plutonic rocks now exposed on submerged rifted blocks inside the gulf. Forty-one samples were dated via U/Pb zircon and 40 Ar/ 39 Ar mineral ages, providing emplacement age and thermochronological constraints...
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Journal Article
Published: 01 September 2009
Bulletin of Canadian Petroleum Geology (2009) 57 (3): 350-386.
...° API). Potential petroleum (gas) generative intervals occur at surface and in the shallow subsurface in deltaic mudstones (Tanglefoot formation) and fluvial mudstones (Tantalus Formation). The lateral extent of these intervals is unknown due to poor outcrop exposure and limited shallow drilling. Both...
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Series: Geological Society, London, Memoirs
Published: 01 January 2004
DOI: 10.1144/GSL.MEM.2004.030.01.12
EISBN: 9781862394056
..., separated from the Central by the Sporonavoloksky fault zone, with unknown basement (probably of same age as in the Central Domain) and with a continuous sedimentary sequence from the Neoproterozoic into the Early Palaeozoic. The Baidaratsky fault zone is expressed by a series of strike-slip faults, which...
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Journal Article
Journal: Geosphere
Published: 01 October 2013
Geosphere (2013) 9 (5): 1161-1200.
... geologic study of the eastern Gulf of California margin in the states of Nayarit and Sinaloa, Mexico, backed by 43 new Ar-Ar and U-Pb mineral ages, and geochemical data that document an earlier widespread phase of extension. This extension across the southern and central Gulf Extensional Province began...
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Journal Article
Published: 11 May 2001
Canadian Journal of Earth Sciences (2001) 38 (4): 495-514.
... of the Rubyrock igneous complex, part of an ophiolitic suite between the North Arm of Stuart Lake and Trembleur Lake ( Schiarizza and MacIntyre 1999 ), and occurring as various thrust sheets and strike-slip fault-bound panels throughout the map area. The age of the Trembleur Ultramafite is unknown, it is intruded...
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Journal Article
Journal: PALAIOS
Published: 01 May 2012
PALAIOS (2012) 27 (5): 317-325.
... specimens are particularly important not only because of their age, but also because they retain three-dimensional detail of some aspects of fossil anatomy that were lost during fossilization of anomalocaridids preserved as compressions in Fezouata mudstones and in older (Cambrian) Burgess Shale-type...
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Journal Article
Published: 01 December 2013
South African Journal of Geology (2013) 116 (2): 297-322.
... of the belt, but locally reaches amphibolite facies, in particular in the Sandspruit and Theespruit Formations ( Cloete, 1999 ). The Fig Tree Group, ~3.26 to ~3.23 Ga in age ( Kröner et al., 1991 ; Byerly et al., 1996 ), comprises different facies in the northern and southern portions of the belt...
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