Windsor Group (Lower Carboniferous) conodont biostratigraphy and palaeoecology, Magdalen Islands, Quebec, Canada

1986 ◽  
Vol 23 (4) ◽  
pp. 439-453 ◽  
Author(s):  
Hilary A. Plint ◽  
Peter H. von Bitter
Keyword(s):  
Nova Scotia ◽  
Shallow Water ◽  
Lower Carboniferous ◽  
Conodont Biostratigraphy ◽  
Conodont Zonation ◽  
Total Lack ◽  
Magdalen Islands

The Taphrognathus transatlanticus, Clydagnathus windsorensis, and Gnathodus zones, initially defined in the Codroy Group of Newfoundland, were identified in the Havre-aux-Maisons Formation of the Windsor Group of the Magdalen Islands, Quebec, Canada. Recognition of these zones permits correlation within the islands and with Newfoundland and Nova Scotia. The Taphrognathus transatlanticus and Clydagnathus windsorensis zones correlate with the lower and upper macrofaunal B Subzone, respectively, whereas the Gnathodus Zone corresponds to the C, D, and E macrofaunal subzones.Tectonism and plastic movement of sulphates and chlorides have resulted in fragmentation and transport of parts of the Havre-aux-Maisons Formation. The conodont zonation complements the macrofaunal zonation permitting correlation of fragmented blocks. When macrofaunas are scarce or absent the conodont zonation provides an alternative to one based on macrofauna only. It has been used effectively in assessing previous zonal determinations based on macrofauna.Conodonts of the Magdalen Islands are dominated by Clydagnathus, Cavusgnathus, Mestognathus, and Taphrognathus, all asymmetric cavusgnathiform genera. This dominance, the total lack of Gnathodus, abundant sulphates and chlorides, as well as foraminiferal and algal evidence, suggest that Lower Carboniferous conodonts of the Magdalen Islands lived in shallow-water shelf environments under conditions of fluctuating salinity.

Conodont biostratigraphy of the Codroy Group (Lower Carboniferous), southwestern Newfoundland, Canada

1982 ◽  
Vol 19 (1) ◽  
pp. 193-221 ◽  
Author(s):  
P. H. von Bitter ◽  
H. A. Plint-Geberl
Keyword(s):  
Nova Scotia ◽  
Lower Carboniferous ◽  
Conodont Biostratigraphy ◽  
Marine Strata ◽  
Bay Area ◽  
Conodont Zone ◽  
Stratigraphic Interval

Four stratigraphically successive conodont assemblage zones have been recognized in the Lower Carboniferous Codroy Group of southwestern Newfoundland. The Diplognathodus Zone is confined to the basal Ship Cove Limestone, and to a highly fossiliferous correlative at Aguathuna. The overlying Taphrognathus Zone occurs in carbonates in the stratigraphic interval above the sequence of massive sulphates and thick clastics. The Taphrognathus Zone, as well as the successive Cavusgnathus Zone, has been recognized on Fischells Brook, as well as in the complex section south of Codroy. The highest conodont zone, the Gnathodus Zone, has been recognized in the Crabbes–Jeffreys Limestone of the St. George's Bay area, and from south of Codroy.The discovery of conodonts of the Diplognathodus Zone in marine strata that are stratigraphie and lithologie correlatives of the Macumber and the Gays River Formations of Nova Scotia now makes it possible to microfaunally characterize the A Subzone, a macrofaunal subzone established in the Windsor Group of Nova Scotia.The Taphrognathus and Cavusgnathus Zones of the Codroy Group of Newfoundland correlate with the lower and upper B Subzone of the Lower Windsor Group of Nova Scotia, respectively. The Gnathodus Zone correlates with the C, D, and E Subzones of the Upper Windsor Group of Nova Scotia.

scholarly journals Lithostratigraphy and biostratigraphy of the Lower Carboniferous (Mississippian) carbonates of the southern Askrigg Block, North Yorkshire, UK

2016 ◽  
Vol 154 (2) ◽  
pp. 305-333 ◽  
Author(s):  
C. N. WATERS ◽  
P. CÓZAR ◽  
I. D. SOMERVILLE ◽  
R. B. HASLAM ◽  
D. MILLWARD ◽  
...  
Keyword(s):  
Shallow Water ◽  
Sea Level ◽  
Carbonate Ramp ◽  
Fault System ◽  
Lower Carboniferous ◽  
Shallow Marine ◽  
Sea Level Fluctuations ◽  
Algal Assemblages ◽  
Lower Palaeozoic ◽  
Southern Flank

AbstractA rationalized lithostratigraphy for the Great Scar Limestone Group of the southeast Askrigg Block is established. The basal Chapel House Limestone Formation, assessed from boreholes, comprises shallow-marine to supratidal carbonates that thin rapidly northwards across the Craven Fault System, onlapping a palaeotopographical high of Lower Palaeozoic strata. The formation is of late Arundian age in the Silverdale Borehole, its northernmost development. The overlying Kilnsey Formation represents a southward-thickening and upward-shoaling carbonate development on a S-facing carbonate ramp. Foraminiferal/algal assemblages suggest a late Holkerian and early Asbian age, respectively, for the uppermost parts of the lower Scaleber Force Limestone and upper Scaleber Quarry Limestone members, significantly younger than previously interpreted. The succeeding Malham Formation comprises the lower Cove Limestone and upper Gordale Limestone members. Foraminiferal/algal assemblages indicate a late Asbian age for the formation, contrasting with the Holkerian age previously attributed to the Cove Limestone. The members reflect a change from a partially shallow-water lagoon (Cove Limestone) to more open-marine shelf (Gordale Limestone), coincident with the onset of marked sea-level fluctuations and formation of palaeokarstic surfaces with palaeosoils in the latter. Facies variations along the southern flank of the Askrigg Block, including an absence of fenestral lime-mudstone in the upper part of the Cove Limestone and presence of dark grey cherty grainstone/packstone in the upper part the Gordale Limestone are related to enhanced subsidence during late Asbian movement on the Craven Fault System. This accounts for the marked thickening of both members towards the Greenhow Inlier.

The Incidence of Nematodes in the Fillets of Small God from Lockeport, Nova Scotia, and the Southwestern Gulf of St. Lawrence

1959 ◽  
Vol 16 (2) ◽  
pp. 213-221 ◽  
Author(s):  
D. M. Scott ◽  
W. R. Martin
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Geographic Variation ◽  
Atlantic Cod ◽  
Age Groups ◽  
Local Variation ◽  
Progressive Increase ◽  
Magdalen Islands

The incidence of nematodes in fillets of Atlantic cod (Gadus callarias) was determined in 1957 in four areas within 10 miles of Lockeport, N.S., and in six areas in the southwestern Gulf of St. Lawrence. About 1,500 cod, mostly between 1 and 6 years of age, were examined. All nematodes examined (517) were larvae. About 97% belonged to the genus Porrocaecum; the remainder appeared to belong to the genus Anisakis. In all areas there was a progressive increase in incidence with increasing age of cod. In age-groups IV and V usually more than 70% of the cod were infected. Considerable local variation in incidence was observed in the Lockeport region. Cod were more heavily infected in inshore than in offshore waters. The samples from the Gulf of St. Lawrence showed less geographic variation in incidence than the Lockeport samples. The incidence in cod from the Magdalen Islands was noticeably lower than that in cod from the New Brunswick shore. Cod in the Gulf of St. Lawrence were infected to about the same extent as those from the offshore areas near Lockeport. The relation between local variations in incidence and the distribution of seals is briefly discussed.

Viséan limestones front the Newfoundland Shelf

1978 ◽  
Vol 15 (9) ◽  
pp. 1422-1436 ◽  
Author(s):  
L. F. Jansa ◽  
B. Mamet ◽  
A. Roux
Keyword(s):  
Nova Scotia ◽  
North American ◽  
Single Species ◽  
Early Carboniferous ◽  
American Continent ◽  
Lower Carboniferous ◽  
The North

Three short cores of Windsor Group carbonates from the northeast Newfoundland Shelf yielded Late Viséan foraminifers of Zones 15 and 16Inf. This most northeastward occurrence of the marine Lower Carboniferous on the American continent has foraminifers identical to those reported from Windsor carbonates exposed in southwestern Newfoundland and Nova Scotia. The foraminifera belong to the North American realm and not to the Tethyan realm. The algae are exceptionally well preserved. Except for a single species, they are also 'American' and not Tethyan. This confirms that the proto-Atlantic effectively separates the North American and Euro–African continental blocks in Early Carboniferous time.

Non-target Gelechiidae and Noctuidae attraction to Aroga trialbamaculella (Lepidoptera: Gelechiidae) pheromone-based trapping systems

2013 ◽  
Vol 145 (1) ◽  
pp. 48-52 ◽  
Author(s):  
Jillian A. Kelly ◽  
Trevor S. Avery ◽  
Donald T. Stewart ◽  
Christopher G. Cutler ◽  
Sonia O. Gaul ◽  
...  
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Introduced Species ◽  
Previous Record ◽  
Lepidoptera Noctuidae ◽  
Magdalen Islands

AbstractCucullia umbratica Linnaeus (Lepidoptera: Noctuidae), Agnippe prunifoliella Chambers (Lepidoptera: Gelechiidae), and Bryotropha plantariella Tengstrom (Lepidoptera: Gelechiidae), were significant bycatch in pheromone-based trapping systems for red-striped fireworm, Aroga trialbamaculella Chambers (Lepidoptera: Gelechiidae), in Nova Scotia, Canada. Cucullia umbratica is a European introduced species and a new macrolepidopteran recorded in continental Canada. The only previous record of this moth in North America was from the Magdalen Islands (Québec, Canada). Potential attractants for B. plantariella, A. prunifoliella, and C. umbratica are a result of this bycatch investigation.

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