Ichnology of the Trenton Group in the Quebec City area

1979 ◽  
Vol 16 (10) ◽  
pp. 2022-2039 ◽  
Author(s):  
R. K. Plckerill ◽  
W. H. Forbes
Keyword(s):  
Environmental Changes ◽  
Temporal Distribution ◽  
Trace Fossil ◽  
Energy Conditions ◽  
Quebec City ◽  
Inner Shelf ◽  
Middle Ordovician ◽  
City Area ◽  
Substrate Stability ◽  
Trenton Group

Marine limestones of the Middle Ordovician (Caradocian) Trenton Group in the Quebec City area are extensively burrowed. Traces referable to Anconichnus horizontalis, cf. Biformites, Bifungites cf. halli, Chondrites, Cruziana cf. pudica, Cruziana, Isopodichnus, Palaeophycus, Planolites, ? Rhizocorallium cf. R. irregulare, Rusophycus, Teichichnus cf. rectus, Tomaculum and Trichichnus are described in detail. Miscellaneous traces, those not morphologically distinct and (or) sufficiently abundant to warrant formal taxonomic treatment, are briefly described. The trace fossil assemblage can be broadly equated with the Cruziana ichnofacies. Southwest of Quebec City the Trenton Group was deposited in a gradually deepening offshore bar to shallow inner shelf situation, whereas to the northeast deposition occurred in a shallow inner shelf to deeper outer shelf – upper slope environment. The spatial and temporal distribution and abundance of the trace fossils are examined in relation to these broad environmental changes. The observed patterns are perhaps best related to variation in energy conditions, substrate stability, and food availability, parameters all broadly related to water depth. The trace fossil density and diversity patterns are analogous to those exhibited by modem and ancient shelly macrobenthos, where in shallow subtidal regimes they are low, then peak in slightly deeper subtidal situations, and gradually decrease seawards with increasing depth and distance from shore.

Repository of Trentonia shegiriana Pickerill and Forbes, 1978 (Annelida, Polychaeta)

1990 ◽  
Vol 64 (6) ◽  
pp. 1041-1041
Author(s):  
Ron K. Pickerill
Keyword(s):  
New Brunswick ◽  
Natural Sciences ◽  
Quebec City ◽  
Middle Ordovician ◽  
City Area ◽  
Catalog Number ◽  
Saint John ◽  
To Receive ◽  
Trenton Group

The holotype of the errant polychaete annelid Trentonia shegiriana Pickerill and Forbes, 1978 from the Middle Ordovician Trenton Group of the Quebec City area, Quebec, Canada (see Pickerill and Forbes, 1978, fig. 1, p. 660), and subsequently figured in Boardman et al. (1987, fig. 12.4, p. 199), has now been reposited in the Division of Natural Sciences, New Brunswick Museum, Saint John, New Brunswick, with the catalog number NBMG 6501. Although the Trenton Group in this area has yielded additional annelids of uncertain affinity (Conway Morris et al., 1982), the holotype of T. shegiriana still represents the only known specimen despite a further decade of investigation. At the time of publication, a repository for the specimen was unavailable, but Dr. R. Miller, Curator for Paleontological Collections, has now arranged to receive the specimen.

A trace fossil preserving its producer (Trentonia shegiriana) from the Trenton Limestone of the Quebec City area

1978 ◽  
Vol 15 (4) ◽  
pp. 659-664 ◽  
Author(s):  
R. K. Pickerill ◽  
W. H. Forbes
Keyword(s):  
Shallow Water ◽  
Trace Fossil ◽  
Quebec City ◽  
Water Interface ◽  
City Area ◽  
Subtidal Environment ◽  
Water Depths

The Trenton Limestone of the Quebec City area contains a moderately abundant and diverse ichnofauna including numerous simple trails that formed at the sediment–water interface. A rare specimen of one of these trails demonstrates that its producer was an errant polychaete annelid, Trentonia shegiriana gen. et sp. nov. It is suggested that T. shegiriana or a morphologically similar errant polychaete annelid was responsible for the production of not only the trails described herein but also the ichnospecies Walcottia rugose. Faunal, ichnofaunal and sedimentological evidence suggests that T. shegiriana inhabited a shallow water subtidal environment with water depths in the order of 10 m or less and preferred a calcisiltite substrate. In the absence of T. shegiriana these simple trails can therefore be utilized as useful palaeoenvironmental indicators.

Simpson Group (Middle Ordovician) Trilobites of Oklahoma

1974 ◽  
Vol 48 (S6) ◽  
pp. 1-54 ◽  
Author(s):  
Frederick C. Shaw
Keyword(s):  
North America ◽  
Energy Conditions ◽  
Eastern North America ◽  
Inner Shelf ◽  
Middle Ordovician ◽  
Continuous Record ◽  
Southern Oklahoma ◽  
Vertical Changes

The Middle Ordovician Simpson Group of southern Oklahoma consists of an exceptionally continuous record of carbonates, shales and quartz sandstones which accumulated in a shallow shelf environment. Vertical changes in the distribution of trilobite genera from these rocks can reasonably be interpreted as due to age rather than the influence of various environments or faunal provinces. The affinities of the lower Simpson trilobite faunas are with inner shelf faunas of trilobite zones M and N known from Utah and eastern Nevada and, to a lesser degree, with early Middle Ordovician faunas of Quebec and Newfoundland. Middle Simpson (McLish and Tulip Creek) Formations reflect slightly higher energy conditions and very few well-preserved trilobites. Those few genera present (for example, Pliomerops and Eorobergia) are more typical of the Chazy Group and correlatives from eastern North America. The higher Bromide Formation, also of shelf origin, displays a distinctly eastern fauna, very similar to elements found in the Chazy Group and the presumably younger Edinburg Group of the east. Although many of Cooper's (1956) Middle Ordovician correlations can be understood, the stage names proposed at that time overlap in some cases and lack proper biostratigraphic definition in others. Abandonment of these stage names is urged until description of Middle Ordovician conodont, graptolite and shelly faunas now underway is nearer completion.

Middle Ordovician Fish-bearing Beds from the St. Lawrence Lowlands of Quebec

1973 ◽  
Vol 10 (6) ◽  
pp. 954-960 ◽  
Author(s):  
Leslie S. Eliuk
Keyword(s):  
Lower Portion ◽  
Quebec City ◽  
Marine Environments ◽  
European Standard ◽  
Shallow Marine ◽  
Vertebrate Fauna ◽  
Middle Ordovician ◽  
Fish Remains ◽  
Black River Group

Ostracoderm tubercles were recovered from the lower portion of two Black River Group sections between Montreal and Quebec City. Some of these fish remains seem identical to tubercles of Astraspis desiderata from the Harding Sandstone of Colorado. The age of the Quebec remains is questionably earliest Blackriveran or basal Caradocian of the European standard. The remains were found in sandy carbonates probably laid down in the supratidal to shallow marine environments. It is concluded that these remains may represent part of a continent-wide, biostratigraphically useful vertebrate fauna and that bulk sampling and acid residuing might be a technique whereby sparse, fragmentary, earliest Paleozoic fish remains could be found.

A NEW TEICHICHNOID TRACE FOSSIL SYRINGOMORPHA CYPRENSIS FROM THE MIOCENE OF CYPRUS

Palaios ◽  
2019 ◽  
Vol 34 (10) ◽  
pp. 506-514 ◽  
Author(s):  
OLMO MIGUEZ-SALAS ◽  
FRANCISCO J. RODRÍGUEZ-TOVAR ◽  
ALFRED UCHMAN
Keyword(s):  
Deep Sea ◽  
Trace Fossil ◽  
Taxonomic Group ◽  
Energy Conditions ◽  
Bottom Current ◽  
Lower Paleozoic ◽  
Shallow Marine ◽  
Current Flows

ABSTRACTA new teichichnoid trace fossil, Syringomorpha cyprensis from the Miocene of Cyprus, is proposed as a vertical burrow composed of an arcuate-like tube with horizontal parts to subhorizontal distally and vertical to subvertical parts proximally and triangular spreiten in the inner corner of the tube. Previously, this ichnogenus was represented only by the lower Paleozoic, shallow marine S. nilssoni, which disappeared after the Cambrian. Syringomorpha cyprensis marks the reappearance of similar behavior, in a deep-sea environment with pelagic, contouritic, and turbiditic sedimentation, influenced by frequent turbiditic and bottom current flows. Both ichnospecies of Syringomorpha could be produced by the same taxonomic group of probable worm like organisms (polychaetes?). Energy conditions were a stronger influence on the distribution of S. cyprensis tracemaker rather depth.

Environmental changes reflected by palynomorphs in the early Middle Ordovician Hanadir Member of the Qasim Formation, Saudi Arabia

2007 ◽  
Vol 50 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Alain Le Hérissé ◽  
Mansour Al-Ruwaili ◽  
Merrell Miller ◽  
Marco Vecoli
Keyword(s):  
Saudi Arabia ◽  
Environmental Changes ◽  
Middle Ordovician
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