Lithostratigraphic Framework and Unified Nomenclature for Silurian and Basal Devonian Rocks in Eastern Gaspé Peninsula, Québec

1975 ◽  
Vol 12 (5) ◽  
pp. 858-872 ◽  
Author(s):  
Pierre-André Bourque
Keyword(s):  
West Point ◽  
The West ◽  
Fine Grained ◽  
Lithostratigraphic Units ◽  
Indian Point ◽  
Stratigraphic Nomenclature ◽  
Gaspe Peninsula ◽  
Eastern Half ◽  
Gaspé Peninsula

A unified stratigraphic nomenclature is proposed for Silurian and basal Devonian rocks in the eastern half of Gaspé Peninsula. The Gascons, West Point and Indian Point Formations of the Chaleurs Bay Synclinorium are extended into the northern part of Gaspé Peninsula. The term St. Léon is restricted to a sequence of mainly fine-grained sediments in which neither the West Point nor the Bouleaux is recognized. The term Lefrançois is abandoned. New lithostratigraphic units here proposed are the Anse à Pierre-Loiselle Formation in the Chaleurs Bay Synclinorium, the Ruisseau Bleau Formation and the Lac McKay Member of the St. Léon Formation in the Mount Alexandre Syncline, and the Ruisseau Louis Member of the St. Léon Formation in the Saint-Jean River Anticline and Mount Alexandre Syncline.

Halysitid corals from Silurian and Devonian rocks of Québec

1980 ◽  
Vol 17 (6) ◽  
pp. 788-796 ◽  
Author(s):  
A. J. Wright ◽  
P.-A. Bourque
Keyword(s):  
West Point ◽  
The West ◽  
Early Devonian ◽  
Gaspe Peninsula ◽  
Different Levels ◽  
Tabulate Corals ◽  
Gaspé Peninsula

Halysitid tabulate corals occur in the Silurian and Devonian rocks of northeastern Gaspé Peninsula, Québec. Silurian specimens from the Dartmouth River and Madeleine River areas are referred to Cystihalysites. A specimen from a possibly Early Devonian level in the Gascons Formation in the Dartmouth River area is assigned to Cystihalysites. Two specimens from different levels in the Early Devonian part of the West Point Formation in the Madeleine River area are assigned questionably to Quepora. The latter occurrences in the West Point Formation demonstrate that this group of tabulate corals lingered into the Devonian.

Halysitid and auloporid tabulate corals from the Gascons and West Point Formations (Silurian), Gaspé, Québec, Canada

1991 ◽  
Vol 65 (5) ◽  
pp. 715-726 ◽  
Author(s):  
Graham A. Young ◽  
Dong-Jin Lee ◽  
James P. A. Noble
Keyword(s):  
New Species ◽  
Environmental Conditions ◽  
West Point ◽  
Reef Facies ◽  
Lower Silurian ◽  
Upper Silurian ◽  
High Degree ◽  
Gaspe Peninsula ◽  
Tabulate Corals ◽  
Gaspé Peninsula

The uppermost Lower Silurian and Upper Silurian Gascons and West Point Formations of the southern Gaspé Peninsula were deposited under a broad range of environmental conditions from deep offshore-shelf to reef facies. Halysitid and auloporid tabulate corals occur in a number of facies and show a high degree of endemism.Two species of Halysitidae and three species of Auloporida are found in these formations. Both halysitids have been previously described from this region. The auloporids include the new species Syringopora minuta and another species that may represent the first known Silurian occurrence of the fletcheriellid genus Pseudofletcheria. A neotype for the halysitid Cystihalysites amplitubulatus (Lambe) is proposed.

scholarly journals Fossil crinoids from the basal West Point Formation (Silurian), southeast Gaspé Peninsula, Québec, eastern Canada

2016 ◽  
Vol 52 ◽  
pp. 211 ◽  
Author(s):  
Stephen K. Donovan ◽  
David G. Keighley
Keyword(s):  
West Point ◽  
Atlantic Canada ◽  
Upper Ordovician ◽  
Eastern Canada ◽  
North Wales ◽  
Stratigraphic Position ◽  
The Common ◽  
Upper Silurian ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

Silurian strata of Atlantic Canada and southern Québec locally preserve common fossil crinoids, albeit mostly as disarticulated remains. New crinoids from the Chaleurs Group, West Point Formation (Ludlow to Pridoli?; Upper Silurian) of the Gaspé Peninsula include Iocrinus? maennili (Yeltysheva) (otherwise known from the Katian of Estonia), Bystrowicrinus (col.) depressus sp. nov. and Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus Donovan. On the basis of both its gross morphology and stratigraphic position, Iocrinus? maennili is unlikely to be an iocrinid disparid, a family that became extinct at the end of the Ordovician. The trivial name has hitherto been erroneously spelled as männili, mannili and mjannili. Most specimens of the common Bystrowicrinus (col.) depressus appear cyclocyclic because the pentastellate lumen occurs in a deeply sunken claustrum that is commonly occluded by sediment; clean specimens are highly distinctive. Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus is similar to a species known from the Katian of North Wales. Taken together, this assemblage is more reminiscent of Katian strata (Upper Ordovician). Ḁis is problematic given the current mapping of the outcrop as West Point Formation (Upper Silurian), suggesting further stratigraphic studies in the area are required.

The Lower Devonian Compton Formation in southern Quebec: from delta front to pro-delta sedimentation

2004 ◽  
Vol 41 (5) ◽  
pp. 571-585 ◽  
Author(s):  
Denis Lavoie
Keyword(s):  
Lower Devonian ◽  
Sedimentary Facies ◽  
High Energy ◽  
Delta Front ◽  
Storm Wave ◽  
Connecticut Valley ◽  
Indian Point ◽  
Delta Sediments ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

The Lower Devonian Compton Formation is the uppermost unit of the St. Francis Group in the Connecticut Valley – Gaspé synclinorium of southern Quebec. The Compton Formation is composed of three informal members. Five distinct sedimentary facies have been recognized in the lower two members of the Compton Formation. High-energy, shallow-marine, and channel sands dominate the Milan member. The overlying Lac Drolet member consists of below wave base mud and silt deposits with abundant turbidite sand. The Milan member is interpreted to represent deposits of a river-dominated delta-front environment, whereas the Lac Drolet member is suggestive of below storm-wave base pro-delta deposits. The transition from the Milan member to the Lac Drolet member is correlated with the deepening event recognized in coeval succession in the Gaspé Peninsula and known as the T2 event. There, the coeval Indian Point Formation is interpreted to represent pro-delta sediments. The new paleogeographic map for the Lochkovian illustrates the development of deltaic lobes from northern Gaspé to southern Quebec. In Lochkovian, deltaic regimes were established in southern Quebec and northeastern Gaspé, whereas the intervening successions (western Gaspé Peninsula – New Brunswick) experienced significant synsedimentary tectonic collapse.

scholarly journals The Lac au Renard Tephra Cluster: a record of Lochkovian (Lower Devonian) volcanism in the Indian Point Formation, Gaspe Peninsula, Quebec, Canada

2019 ◽  
Vol 55 ◽  
pp. 361-378
Author(s):  
James R. Ebert ◽  
Damon K. Matteson
Keyword(s):  
New York ◽  
Lower Devonian ◽  
Age Determination ◽  
Volcanic Source ◽  
Tephra Beds ◽  
Indian Point ◽  
Gaspe Peninsula ◽  
Helderberg Group ◽  
Gaspé Peninsula

Approximately twenty tephra beds, comprising the Lac au Renard Tephra Cluster (new), occur in the Rosebush Cove and Petit Portage members of the Indian Point Formation (Chaleurs Group) on the Gaspe Peninsula of Quebec, Canada. The tephra beds range in thickness from <1.0 cm to 82 cm and occur in a mudrock-dominated sequence with coarser tempestite interbeds. Mineralogically and texturally graded accumulations of phenocrysts mark the bases of the thickest tephra beds. Early diagenetic concretions in one composite tephra preserve pre-compaction fabrics and original hypocrystalline textures with microphenocrysts and devitrified glass shards. The presence of plagioclase, quartz, K-feldspar, biotite, apatite, and zircon suggest a rhyolitic source. The coarseness of the microphenocrysts in the basal accumulations, along with the abundance and thickness of the tephras, suggest that deposition in the Gaspe area was in a proximal position relative to the volcanic source. The zonal graptolites Monograptus praehercynicus and Monograptus aequabilis ssp. from the Petit Portage Member indicate a middle Lochkovian age for the Lac au Renard Tephra Cluster of the Indian Point Formation. Correlation with the tephra cluster that includes the Judds Falls Bentonite in the New Scotland Formation and other possible tephras in the Kalkberg Formation (Helderberg Group) of New York and the Corriganville and Mandata formations of Pennsylvania is likely. The graptolite fauna of the Indian Point and probable correlations to New York may provide additional biostratigraphic constraints on a U–Pb zircon radiometric age determination of 417.6 Ma from New York that has been used to estimate the age of the Silurian–Devonian boundary.

Stratigraphie du Silurien du Tassili N'Ajjer

1964 ◽  
Vol S7-VI (4) ◽  
pp. 586-591 ◽  
Author(s):  
Paul Dubois ◽  
Pierre Mazelet
Keyword(s):  
The West ◽  
Fine Grained ◽  
Important Member ◽  
Clay Formation ◽  
Plastic Clays ◽  
Fine Grained Sand ◽  
Eastern Half ◽  
Homogeneous Unit

Abstract A new lithostratigraphic nomenclature is established for the Silurian of the Tassili N'Ajjer and the mole anticlines of Essaoui Mellene in southeastern Algeria from a new series of sections examined from Tihemboka westward to Oued Amassine. The unit termed the graptolite clay formation is a homogeneous unit of plastic clays ranging from 350 to 450 meters in thickness, with thin lenticular beds of ripple-marked fine-grained sandstone. The sandstones in the upper part of the formation thicken eastward, and in the eastern half of the region the fine-grained sand gives way to coarser grained sand and grit. In the eastern third of the region, the Gara Marhet sandstone is an important member. The overlying heterogeneous Atafatafa formation comprising multiple facies of lenticular silty clays, siltstones, shaly sandstones, ferruginous oolitic sandstones, massive sandstones, and quartzites thins from a thickness of 150 meters on the west, to 80 meters on the east. Ripple marks, markings of organic origin, and tigillites are numerous.

A SWARM OF MALES OF THE RARE AND PRIMITIVE CRANEFLY PROTOPLASA FITCHII OBSERVED NEAR CHANDLER IN THE GASPE PENINSULA (DIPTERA)

1929 ◽  
Vol 61 (3) ◽  
pp. 70-72 ◽  
Author(s):  
G. C. Crampton
Keyword(s):  
The South ◽  
The West ◽  
South Shore ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

While making an “auto” trip around the Gaspé Peninsula (Province of Quebec) in the summer of 1928. I encountered a swarm of dark-winged insects which I at first took to be may flies “dancing” over a bridge across a river to the west of Chandler—a town on the south shore, well out toward the eastern end of the Gaspé Peninsula. Stopping the car, I descended to inalte a few “investigational” sweepings with my net, and to my utter amazement discovered that I had captured a net full of males of the rare and much-sought (because of its primitiveness) “cranefly” Pratoplasa fitchii, O.S., a member of the superfamily Psychodoidea.

scholarly journals Oligocene turbidite fans of the Dukla Basin: New age data from the calcareous nannofossils and paleoenvironmental conditions (Cergowa beds, Polish–Slovakian borderland)

2019 ◽  
Vol 70 (4) ◽  
pp. 311-324
Author(s):  
Joanna Pszonka ◽  
Katarína Žecová ◽  
Marek Wendorff
Keyword(s):  
New Age ◽  
Calcareous Nannofossils ◽  
The West ◽  
Fine Grained ◽  
Lower Oligocene ◽  
Open Sea ◽  
Lithostratigraphic Units ◽  
Outer Carpathians ◽  
Tectonic Windows ◽  
Normal Salinity

Abstract Calcareous nannofossils found in the Cergowa beds of the Dukla and Fore-Dukla tectonic units in the Outer Carpathians indicate a time of deposition in the range of the NP23–NP24 nannoplankton zones of the Lower Oligocene. Nannoplankton assemblages reflect the paleoecological changes at the Eocene–Oligocene transition from: (i) a greenhouse to an icehouse climate; (ii) brackish to normal salinity suggesting open sea conditions, which were controlled by the Paratethys Basin closure followed by opening and connection with the Tethyan Ocean. The absence of nannofossils of NP25 zone, but their presence in the tectonic windows between 40 and 80 km to the west, shows that deposition of the Cergowa beds in the western part of the basin lasted longer than in the east. Occurrences of nannofossils indicating zones NP16 and NP21, found in the uppermost mudstone-rich parts of studied sections, may prove the remobilization and redeposition of sediments of this stratigraphic age. Potentially, eroded material could be derived from some of the following lithostratigraphic units: NP16 — the Hieroglyphic beds, Przybyszów sandstones and Upper variegated shales; NP21 — the Globigerina marls, Mszanka sandstones and sub-Chert marls and shales and/or fine-grained equivalent of these units. Reworked specimens derived from the older Mesozoic strata occur occasionally in various samples.

scholarly journals Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas

2017 ◽  
pp. 1-8
Author(s):  
Anthony L. Layzell ◽  
Robert S. Sawin ◽  
Rolfe D. Mandel ◽  
Greg A. Ludvigson ◽  
Evan K. Franseen ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Fine Grained ◽  
Lithostratigraphic Unit ◽  
Quaternary Stratigraphy ◽  
Lithostratigraphic Units ◽  
Glaciofluvial Deposits ◽  
Deforest Formation ◽  
Grand Island ◽  
Stratigraphic Nomenclature ◽  
Glacial Tills

This paper outlines Quaternary nomenclature changes to Zeller (1968) that have been adopted by the Kansas Geological Survey (KGS). The KGS formally recognizes two series/epochs for the Quaternary: the Holocene and Pleistocene. Pleistocene stage/age names Kansan, Aftonian, Nebraskan, and Yarmouthian are abandoned and replaced with the broader term "pre-Illinoian." Formation names Bignell, Peoria, Gilman Canyon, and Loveland are maintained for loess units. Formation names for the following alluvial lithostratigraphic units are abandoned: Crete, Sappa, Grand Island, Fullerton, and Holdrege. The Severance Formation is adopted as a new lithostratigraphic unit for thick packages of late Pleistocene alluvium and colluvium in Kansas. The DeForest Formation is accepted as a valid lithostratigraphic unit for deposits of fine-grained Holocene alluvium in Kansas. Formation names Iowa Point, Nickerson, and Cedar Bluffs for glacial tills and Atchison and David City for glaciofluvial deposits are abandoned. The Afton and Yarmouth Soils are abandoned as pedostratigraphic units, whereas the Sangamon Geosol and Brady Geosol are maintained.

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