scholarly journals Structural Reconnaissance of the Green Head Group Saint John, New Brunswick

1982 ◽  
Author(s):  
D Nance
Keyword(s):  
New Brunswick ◽  
Head Group ◽  
Saint John

The Stromatolite Archaeozoon acadiense from the Proterozoic Green Head Group of Saint John, New Brunswick

1974 ◽  
Vol 11 (8) ◽  
pp. 1098-1115 ◽  
Author(s):  
H. J. Hofmann
Keyword(s):  
New Brunswick ◽  
Tectonic Deformation ◽  
Head Group ◽  
Saint John

The columnar branching stromatolite Archaeozoon acadiense Matthew 1890 occurs in platy fault-slivers of a biohermal or biostromal limestone that accumulated on a shallow submerged platform, possibly during Neohelikian time. The columns show that the stromatolitic beds at Green Head face north, and can be used to provide a partial estimate of amount and type of local tectonic deformation. Archaeozoon Matthew has attributes similar to those for such Riphean groups as Tungussia, Baicalia and Jacutophyton, and it is likely that one or more of these are junior subjective synonyms of Archaeozoon, or represent at least morphologic variants.

On the inorganic character of Halichondrites graphitiferus Matthew, a supposed sponge from the Precambrian of Saint John, New Brunswick

1987 ◽  
Vol 24 (9) ◽  
pp. 1913-1915 ◽  
Author(s):  
Randall F. Miller
Keyword(s):  
New Brunswick ◽  
Head Group ◽  
Similar Nature ◽  
Saint John

Discovery of the holotype of Halichondrites graphitiferus Matthew in the collections of the New Brunswick Museum made it necessary to reexamine its affinity to the Porifera as first described by G. F. Matthew in 1890. Since its publication, the organic nature of H. graphitiferus has been questioned; however, the holotype has not been accessible until recent organization of the museum's collections. Examination of the holotype suggests the "spicules," described by Matthew from the Precambrian Green Head Group of Saint John, New Brunswick, are more likely a combination of scratches on the surface of the graphite and cleavage demonstrated by the mineral. Other "spicules" from Musquash Harbour, New Brunswick, are of a similar nature.

Discovery of the Holotype of Cyathospongia(?) eozoica Matthew, a supposed Precambrian sponge from Saint John, New Brunswick

1990 ◽  
Vol 27 (3) ◽  
pp. 473-475 ◽  
Author(s):  
Randall F. Miller
Keyword(s):  
New Brunswick ◽  
Head Group ◽  
Saint John

Discovery of the holotype of the supposed sponge Cyathospongia(?) eozoica Matthew in the collections of the New Brunswick Museum completes a search for two doubtful Precambrian "sponges" described by Matthew almost a century ago. The organic nature of C.(?) eozoica had been questioned almost since its publication in 1890, but the specimen had been inaccessible. Examination of the holotype of C.(?) eozoica suggests the "spicules" from the Green Head Group of Saint John are probably a boxwork-like weathering pattern and are not organic.

Age of the Brookville Gneiss and associated rocks, southeastern New Brunswick

1982 ◽  
Vol 19 (11) ◽  
pp. 2158-2166 ◽  
Author(s):  
William J. Olszewski Jr. ◽  
Henri E. Gaudette
Keyword(s):  
New Brunswick ◽  
Source Area ◽  
Head Group ◽  
Low Grade ◽  
Tectonic Event ◽  
Cape Breton Island ◽  
Eastern Margin ◽  
Saint John ◽  
Loss Event ◽  
Single Zircon

The Brookville Gneiss is a medium- to high-grade quartz–feldspar–biotite and hornblende–quartz–feldspar–biotite gneiss found north and northeast of Saint John, New Brunswick. The Green Head Group, a sequence of low-grade metasediments, surrounds the Brookville Gneiss. Analyses of zircons with euhedral to subhedral overgrowths and rounded to subrounded cores from the Brookville Gneiss yield an upper intercept age on concordia of 1641 Ma, considered to be the age of the source area for the zircons. The zircon analyses also indicate two Pb-loss events at approximately 780 and 370 Ma. These ages are confirmed by zircon analyses of a quartz diorite gneiss from Green Head Island, which yields ages of 827 and 333 Ma. A small euhedral single zircon from the Brookville Gneiss, believed to be formed during metamorphism, gives a concordant age of 814 Ma corresponding to the first Pb-loss event. Rb–Sr whole-rock analyses of a granite from the east side of Musquash Harbour southwest of Saint John give an age of 392 Ma and an initial Sr ratio of 0.7187 substantiating the second Pb-loss event.The results indicate that the Brookville Gneiss and Green Head Group are older than 800 Ma and probably younger than 1200 Ma. The zircon source area age (1641 Ma) and first Pb-loss event (800 Ma) are similar to ages found in rocks of the eastern margin of the Appalachian orogen from Massachusetts and Cape Breton Island, respectively. They suggest a setting and tectonic event correlated in time for the Late Precambrian of the eastern margin distinct from the younger so-called "Avalonian."

Timing and Extent of Drift of Shortnose Sturgeon Larvae in the Saint John River, New Brunswick, Canada

2013 ◽  
Vol 142 (3) ◽  
pp. 717-730 ◽  
Author(s):  
Sima Usvyatsov ◽  
Jeffrey Picka ◽  
Andrew Taylor ◽  
James Watmough ◽  
Matthew Kenneth Litvak
Keyword(s):  
New Brunswick ◽  
Shortnose Sturgeon ◽  
Saint John
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