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Gamachian

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Journal Article
Published: 01 July 1987
Canadian Journal of Earth Sciences (1987) 24 (7): 1450-1464.
... element.Sparse conodont faunas from Rock River occur in strata below a level bearing graptolites of the D . ornatus Zone and between this zone and the succeeding P . pacificus Zone. These conodonts have a range of "Trentonian" –Gamachian (upper Caradoc –Hirnantian).The fauna from Blackstone River is from...
Journal Article
Published: 01 January 2010
Journal of Paleontology (2010) 84 (1): 88-97.
...R.L. ETHINGTON; L.M. ROSS, JR Abstract Ptiloncodus Harris, 1962 , a hook-shaped microfossil, is present in late Floian through Hirnantian [ = late Ibexian through Gamachian] rocks in regions marginal to Laurentia. Specimens from the Great Basin provide additional information about this enigmatic...
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Journal Article
Published: 01 September 2007
Bulletin of Canadian Petroleum Geology (2007) 55 (3): 179-216.
... are dated as late Caradocian–late Ashgillian with the Maysvillian or part of Maysvillian and Gamachian missing: Lower Silurian formations are dated as early Rhuddanian–middle Telychian, Llandovery. recognition of sea-level events based on the stratigraphic distribution and known ecologic partitioning of key...
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Journal Article
Published: 26 January 2001
Canadian Journal of Earth Sciences (2001) 38 (2): 125-141.
... and dental notches that typify Silurian and Devonian strophomenids begin in the fauna of the Ellis Bay Formation. Thus the most important interval of strophomenid faunal turnover was at the base of the Gamachian (the base of the Hirnantian) and not at the Ordovician–Silurian boundary. Muscle attachment pads...
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Journal Article
Journal: PALAIOS
Published: 01 April 1998
PALAIOS (1998) 13 (2): 98-112.
... by runoff from expanding terrestrial areas became concentrated in the shrinking sea. During the Gamachian and early Rhuddanian, elevated nutrient levels and environmental instability within the small sea were likely instrumental in maintaining the structure of the Edgewood Province. By the late Rhuddanian...
Journal Article
Published: 01 October 1989
Canadian Journal of Earth Sciences (1989) 26 (10): 1880-1903.
... an age range from Shermanian to Gamachian. Les unités de carbonates et de carbonates pétrolifères (« schistes bitumineux ») sur des îles Southampton, Baffin et Akpatok ont livré en tout 2277 conodontes, et les plus utiles biostratigraphiquement indiquent que les unités ne sont pas toutes corrélatives...
Journal Article
Published: 01 April 1987
Canadian Journal of Earth Sciences (1987) 24 (4): 643-653.
... and below the G . persculptus Zone (?) and include Oulodus rohneri , Plectodina florida , and Noixodontus . Amorphognathus ordovicicus , Gamachignathus ensifer , O . ulrichi , and Plectodina tenuis occur in both faunas. These represent Fauna 12, found in late Richmondian strata, rather than the Gamachian...
Journal Article
Published: 01 September 1986
Canadian Journal of Earth Sciences (1986) 23 (9): 1297-1308.
... from the overlying Ellis Bay Formation (Ashgili: Gamachian, Himantian) are assigned to a new species, A . muirwoodae . A further, as yet unnamed, species of strophochonetid is also described and figured from the Silurian (Llandovery) Jupiter Formation. Detailed external and internal analysis...
Journal Article
Published: 01 June 1985
Canadian Journal of Earth Sciences (1985) 22 (6): 838-849.
... into the typical Becscie Formation. The Hirnantia brachiopod fauna and the Mucronaspis trilobite fauna of the Percé area are younger than the base of the Gamachian and are of the persculptus Zone. An ordered succession of appearances on Anticosti Island and the Oslo region is demonstrated: the lower boundary...
Journal Article
Published: 01 April 1983
Canadian Journal of Earth Sciences (1983) 20 (4): 651-671.
...Godfrey S. Nowlan Abstract Diverse conodont faunas recovered from the Grog Brook Group in northwestern New Brunswick indicate a Late Ordovician, probably Gamachian, age. The conodonts are of mixed provincial affinity including components of the North Atlantic Province (e.g., Hamarodus , Icriodella...
Journal Article
Published: 01 November 1982
Canadian Journal of Earth Sciences (1982) 19 (11): 2179-2206.
..., the Eomonorachinae characterizes Laurentia, and the Monorakinae characterizes Siberia. In North America, pterygometopids occur in strata of Whiterockian to Gamachian (Llanvirn to Ashgill) age. The Pterygometopinae is represented by Achatella Delo, the Monorakinae by Monorakos Schmidt, the Chasmopinae by Toxochasmops...
Journal Article
Published: 01 July 1982
Canadian Journal of Earth Sciences (1982) 19 (7): 1474-1485.
.... This new genus differs from Gamachignathus and Prioniodus in apparatus plan and element morphology. A Richmondian age is suggested by the fauna rather than a latest Ordovician Gamachian age. Both lithological and paleontological data suggest a post-Richmondian hiatus.The Silurian Bowling Green Dolomite...
Series: AAPG Memoir
Published: 01 January 1969
DOI: 10.1306/M12367C39
EISBN: 9781629812274
.... The Lorraine Group of the St. Lawrence Lowlands and the English Head, Vaureal, and Ellis Bay Formations of Anticosti contain three additional graptolite assemblages. Ashgillian graptolites range through the middle and upper English Head; the succeeding Vaureal and Ellis Bay of Richmondian and Gamachian ages...
Series: GSA Memoirs
Published: 01 January 1963
DOI: 10.1130/MEM90-p1
... with the Stonewall Formation. The faunas indicate a close temporal relationship between the Bad Cache Rapids and Churchill River groups. The latter is considered Richmondian and in part Gamachian. A Late Ordovician age is thus also suggested for the Bad Cache Rapids Group and hence for the coeval Red River...
Journal Article
Published: 01 November 1960
Journal of Paleontology (1960) 34 (6_Part_2): 1057-1076.
... Silurian strata suggests the English Head, Vaureal, and Ellis Bay formations are equivalent in age to the Richmond group, Ohio, and it does not support the placement of these Anticosti beds into a "Gamachian series" of post-Richmond but pre-Silurian age. Based on skeletal microstructures observed in type...
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Stratigraphic and geographic distribution of  Plaesiomys . Symbol † indicat...
Published: 01 November 2013
Table 11 Stratigraphic and geographic distribution of Plaesiomys . Symbol † indicates Gamachian (Hirnantian), all other species are Richmondian (Katian).
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Figure 1. Geographic locations and stratigraphic positions of William Lake ...
in > Geology
Published: 01 October 2007
Figure 1. Geographic locations and stratigraphic positions of William Lake (WL) and Airport Cove (AC) sites, Manitoba (MB), Canada. WL stratigraphy is after Elias (1991) and Bezys (1996) . Churchill stratigraphy is after Elias et al. (1999) and Young et al. (2003) . Gamach.—Gamachian.
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Figure  12 —Phylogeny at generic and subgeneric levels. Primitive  Clidochi...
Published: 01 March 2001
Black Riverian to the Gamachian; the small tick mark on the Ordovician interval of the time scale separates Middle and Upper Ordovician with the Edenian being placed in the Upper Ordovician; Silurian interval is restricted to Llandoverian. Ranges of taxa that extend beyond the Ordovician are listed
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Stratigraphic chart for the Montoya Group with age constraints from  Bergst...
Published: 01 August 2014
Figure 2 Stratigraphic chart for the Montoya Group with age constraints from Bergström et al. (2008) and Gradstein et al. (2012) . Chat = Chatfieldian Stage; Eden = Edenian Stage; May = Maysvillian Stage; Rich = Richmondian Stage; Hirnant = Hirnantian Stage; Gamach = Gamachian Stage; Sand
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Sequence stratigraphy and lithostratigraphy of the Upper Ordovician of the ...
Published: 01 September 2003
the Cincinnati Arch, but is not present on the Nashville Dome. "D" and "M" in the Sequences and Events column represent the Deicke (T3) and Millbrig (T4) K-bentonites. "R," "K," and "G" in Stage column represent Rocklandian, Kirkfieldian, and Gamachian. Vertical dashed lines in the lithostratigraphy column