Trace fossils from the Silurian Chaleurs Group of southeastern Gaspé Peninsula, Québec

1977 ◽  
Vol 14 (2) ◽  
pp. 239-249 ◽  
Author(s):  
R. K. Pickerill ◽  
B. V. Roulston ◽  
J. P. A. Noble
Keyword(s):  
Trace Fossils ◽  
Low Energy ◽  
Energy Conditions ◽  
Extreme Caution ◽  
Shallow Subtidal ◽  
Gaspe Peninsula ◽  
Variable Water ◽  
Water Depths ◽  
Gaspé Peninsula ◽  
Paleoenvironmental Indicators

A suite of previously undescribed trace fossils from the three main sections of the Silurian (Chaleurs Group) of the southeastern Gaspé Peninsula are examined in detail. The ichnofauna includes a diverse assemblage of forms produced essentially by vermiform and other problematica (Chondrites,Cosmorhaphe; Diplocraterion parallelum Torell, Gyrophyllites, Monocraterion, Planolites annularius Walcott, Planolites cf. beverleyensis (Billings), Rhizocorallium cf. irregulare (Mayer), Scalarituba missouriensis Weller, Skolithos, Zoophycos, pholadid-like bur-rows and grazing trails). The trace fossils occur in four distinctive and recurring associations. Three of these associations, the Scalarituba – Cosmorhaphe, Chondrites, and Diplocraterion associations are useful paleobathymetric and paleoenvironmental indicators, as they all occur in lagoonal, intertidal, or shallow subtidal regimes. The Scalarituba – Cosmorhaphe and Chondrites associations are characterized by shallow burrows and developed in moderately low energy conditions. The monospecific Diplocraterion association developed on an unstable substrate subject to higher rates of sedimentation. The fourth, Zoophycos association, is found in rocks deposited in variable water depths and is a much less useful paleobathymetric and paleoen-vironmental indicator so that conclusions regarding its distribution must be made with extreme caution.

Enigmatic trace fossils from the Silurian Chaleurs Group of the southeastern Gaspé Peninsula, Quebec

1977 ◽  
Vol 14 (12) ◽  
pp. 2729-2736 ◽  
Author(s):  
R. K. Pickerill ◽  
B. V. Roulston
Keyword(s):  
Trace Fossils ◽  
Trace Fossil ◽  
Vertical Shaft ◽  
Fecal Material ◽  
Branching Patterns ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

A series of enigmatic trace fossils from the Silurian Chaleurs Group (Gascons Formation) of the southeastern Gaspé Peninsula, Quebec, is described in detail. Two types of trace fossil are present and are herein referred to as Form A and Form B. Form A burrows are essentially horizontal branching tunnel networks, typically showing Y-shaped branching patterns and 'turn arounds'. It is suggested that the burrows are feeding and dwelling burrows of some unknown arthropod group, possibly primitive crustaceans. Form B burrows are vertical bulbous structures consisting of an enlarged spherical or subspherical bulbous base which extends upward into an upward tapering vertical shaft. It is suggested that these structures may represent brood structures of the same arthropod group, tubules on the bulb representing juvenile migration exits and tubercles possibly representing poorly preserved and incomplete migration exits or alternatively repositories for fecal material.

scholarly journals Palaeontology of the Middle Turonian limestones of the Nysa Kłodzka Graben (Sudetes, SW Poland): biostratigraphical and palaeogeographical implications

Geologos ◽  
2012 ◽  
Vol 18 (2) ◽  
pp. 83-109 ◽  
Author(s):  
Alina Chrząstek
Keyword(s):  
Upper Cretaceous ◽  
Trace Fossils ◽  
Low Energy ◽  
Oxygen Deficit ◽  
Siliceous Sponge ◽  
Fossil Assemblage ◽  
Calcareous Deposits ◽  
Shallow Subtidal ◽  
Sw Poland ◽  
Normal Salinity

Palaeontology of the Middle Turonian limestones of the Nysa Kłodzka Graben (Sudetes, SW Poland): biostratigraphical and palaeogeographical implicationsThe ammonitesLewesiceras peramplumMantell and?Lewesicerassp. are reported from the Upper Cretaceous in the Nysa Kłodzka Graben; they date from the Middle Turonian and ?Coniacian, respectively. The Middle Turonian limestones of the Stara Bystrzyca quarry contain an abundant assemblage of inoceramids (Inoceramus cuvieriSowerby and I. lamarcki Parkinson) and other bivalves, including oysters, as well as brachiopods and trace fossils. Micropalaeontological data show the presence of foraminifers and siliceous sponge spiculae, bryozoans, ostracods and fragments of bivalves and gastropods. The Middle Turonian calcareous deposits belongs to the upper part of theInoceramus lamarckiZone (late Middle Turonian) and were deposited on a shallow, subtidal offshore shelf. They overlie the Middle Turonian Bystrzyca and Długopole Sandstones, which represent foreshore-shoreface delta deposits. The fossil assemblage suggests a moderate- to low-energy, normal-salinity environment with occasionally an oxygen deficit.

Weather and Outbreaks of the Spruce Budworm in the Province of Quebec from 1939 to 1956

1961 ◽  
Vol 93 (2) ◽  
pp. 118-123 ◽  
Author(s):  
J. G. Pilon ◽  
J. R. Blais
Keyword(s):  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
The Past ◽  
Forest Regions ◽  
Tree Component ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

Nearly all forest regions in the Province of Quebec where balsam fir (Abies balsamea (L.) Mill.) is an important tree component have been subjected to severe defoliation by the spruce budworm, Choristoneura fumiferana (Clem.), during the past 20 years. These outbreaks have followed an easterly direction beginning near the Ontario-Quebec border in 1939 and ending in the Gaspé Peninsula in 1958.

Pleistocene trace fossils in the Ironshore Formation, Little Cayman, British West Indies

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
Robert Metz
Keyword(s):  
West Indies ◽  
Trace Fossils ◽  
Energy Conditions ◽  
British West Indies

AbstractOosparite grainstones of the Pleistocene Ironshore Formation, Little Cayman, British West Indies, contain the trace fossils Conichnus conicus, Ophiomorpha nodosa, and Planolites beverleyensis. The dominance of vertically-oriented trace fossils, complexity of cross-stratifications, coarseness of the sediment channel fill, and presence of several rudstone layers suggest deposition close to the seaward portion of lagoonal channels where higher energy conditions prevailed.

scholarly journals A Water Temperature Simulation Model for Rice Paddies With Variable Water Depths

2017 ◽  
Vol 53 (12) ◽  
pp. 10065-10084 ◽  
Author(s):  
Atsushi Maruyama ◽  
Manabu Nemoto ◽  
Takahiro Hamasaki ◽  
Sachinobu Ishida ◽  
Tsuneo Kuwagata
Keyword(s):  
Simulation Model ◽  
Water Temperature ◽  
Rice Paddies ◽  
Variable Water ◽  
Water Depths

Gaspe Peninsula

1924 ◽  
Vol 14 (2) ◽  
pp. 325
Author(s):  
F. J. Alcock ◽  
J. M. Clarke
Keyword(s):  
Gaspe Peninsula ◽  
Gaspé Peninsula

The onset of the early Toarcian flooding of the Pliensbachian carbonate platform of Central Tunisia (North-South Axis) as inferred from trace fossils and geochemistry

2021 ◽  
pp. SP514-2021-10
Author(s):  
Matías Reolid ◽  
Mohamed Soussi ◽  
Jesús Reolid ◽  
Wolfgang Ruebsam ◽  
Ilef Belhaj Taher ◽  
...  
Keyword(s):  
Carbonate Platform ◽  
High Energy ◽  
Trace Fossils ◽  
Energy Conditions ◽  
Local Conditions ◽  
Content Type ◽  
The North ◽  
Sea Bottom ◽  
Supplementary Material ◽  
South Axis

AbstractThe flooding of the Lower Jurassic shelf in the North Gondwana Palaeomargin during the early Toarcian occurred on a fragmented and irregular topography affected by differential subsidence—due to the activity of listric faults along the North-South Axis of Tunisia—that favoured lateral changes in facies and thickness at a kilometric scale. The onset of Toarcian sedimentation (Polymorphum ammonite Zone, NJT5c nannofossil Subzone) in two adjacent sections was characterised by the deposition of limestones under high-energy conditions. The Châabet El Attaris section was located in a depressed sub-basin, and recorded restricted environmental conditions owing to water stagnation and an oxygen-depleted sea-bottom. Therefore, dark mudstones developed, with increased TOC contents and enhanced accumulation of redox-sensitive elements. The sedimentation of limestones bearing gutter cast structures is related to gravity flows probably linked to storm activities. These processes favoured the remobilization of sediments at the sea floor, as well as oxygen input to bottom waters, as shown by the record of trace fossils including Zoophycos, Ophiomorpha, and secondarily, Chondrites and Diplocraterion. The thinly interbedded dark mudstones are locally rich in thin-shelled bivalves that re-colonised the sea bottom after the sedimentation of these high-energy deposits, and subsequently underwent mass mortality related to the return of oxygen-depleted conditions. The Kef El Hassine section is located in the upper part of a tilted, less subsident block, as indicated by its reduced thickness compared with the Châabet El Attaris section; the absence of dark mudstones implies oxic conditions. The Polymorphum Zone consists of limestones showing evidence of sedimentation under high-energy conditions, along with hardgrounds. The occurrence of Zoophycos (deep-tiers) in the upper part of some limestone beds of the Polymorphum Zone is linked to minor erosive processes. The top of the high-energy sequence—below the deposits of a marly interval corresponding to the Levisoni Zone—is interpreted as a hardground given the high content of belemnites and Arenicolites, some of them boring on the eroded Zoophycos and Thalassinoides. This study shows that the sedimentary expression of the Jenkyns Event is not uniform across Tunisia, supporting the importance of local conditions in determining the development of anoxic conditions.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5510162

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