scholarly journals New species of marine invertebrate fossils from the Bearpaw Formation of southern Alberta

1930 ◽  
Author(s):  
M Y Williams
Keyword(s):  
New Species ◽  
Marine Invertebrate ◽  
Southern Alberta ◽  
Invertebrate Fossils

Pennsylvanian brachiopods from the Geumcheon-Jangseong Formation, Pyeongan Supergroup, Taebaeksan Basin, Korea

2010 ◽  
Vol 84 (3) ◽  
pp. 417-443 ◽  
Author(s):  
Sangmin Lee ◽  
Duck K. Choi ◽  
G. R. Shi
Keyword(s):  
New Species ◽  
North China ◽  
Marine Invertebrate ◽  
Late Paleozoic ◽  
Marine Environments ◽  
Faunal Composition ◽  
Taebaeksan Basin ◽  
Close Affinity ◽  
Two New Species ◽  
Invertebrate Fossils

We provide the first detailed systematic taxonomy and paleoecological investigation of late Paleozoic brachiopod faunas from Korea. Specifically, we focus on the brachiopods from the Geumcheon-Jangseong Formation, the lower part of the Pyeongan Supergroup in the Taebaeksan Basin. The formation yields a variety of marine invertebrate fossils, including brachiopods, molluscs, echinoderms, corals, fusulinids, and conodonts. Diverse brachiopods are described from six siliciclastic horizons of the formation at three localities, including 23 species belonging to 20 genera with two new species: Rhipidomella parva n. sp. and Stenoscisma wooi n. sp. Three brachiopod assemblages of the late Moscovian (Pennsylvanian) age are recognized based on their species compositions and stratigraphic distributions, namely the Choristites, Rhipidomella, and Hustedia assemblages. The brachiopod faunal composition varies within each assemblage as well as between the Assemblages, most likely reflecting local paleoenvironmental and hence paleoecological differences. The Choristites Assemblage includes relatively large brachiopods represented by Derbyia, Choristites, and Stenoscisma and may have inhabited open marine to partly restricted marine environments, whereas the Rhipidomella and Hustedia Assemblages consist of a small number of small-sized brachiopods living in lagoonal environments. The Choristites Assemblage shows a close affinity with Moscovian brachiopod assemblages in the eastern Paleo-Tethys regions, especially the Brachythyrina lata-Choristites yanghukouensis-Echinoconchus elegans Assemblage of North China, whereas the Rhipidomella and Hustedia assemblages both exhibit strong endemism.

Pennsylvanian nuculoids (Bivalvia) from the Ixtaltepec Formation, Oaxaca, Mexico

1997 ◽  
Vol 71 (3) ◽  
pp. 400-407 ◽  
Author(s):  
Sara A. Quiroz-Barroso ◽  
Maria del Carmen Perrilliat
Keyword(s):  
New Species ◽  
Marine Invertebrate ◽  
Clastic Rocks

Five species of nuculoid bivalves are described from Pennsylvanian outcrops of the Ixtaltepec Formation, Oaxaca, Mexico: Nuculopsis sp., Palaeoneilo sinuosus new species, Paleyoldia sp., Phestia bellistriata, and Phestia sp. have been collected in clastic rocks and in association with other marine invertebrate groups, which represent a peri-reefal environment.

THE APPLICATION OF A NEW NOMENCLATURAL APPROACH TO UPPER CRETACEOUS PLANT MICROFOSSILS FROM WESTERN CANADA

1957 ◽  
Vol 35 (3) ◽  
pp. 349-375 ◽  
Author(s):  
Glenn E. Rouse
Keyword(s):  
New Species ◽  
Historical Development ◽  
Upper Cretaceous ◽  
Vancouver Island ◽  
Western Canada ◽  
New Genera ◽  
Southern Alberta ◽  
Plant Microfossils ◽  
New System

A new system of nomenclature is proposed with the purpose of presenting a scheme which will be applicable to spores, pollens, and other microfossils from all geological ages. A review of previous nomenclatural systems is presented to indicate the historical development of microfossil nomenclature. The applicability of the new system is illustrated by naming 21 new species and four new genera of Upper Cretaceous microfossils from the Comox formation of Vancouver Island and the Oldman formation of southern Alberta. The microfossil conspecti are briefly compared with the assemblage previously reported from the Brazeau formation of western Alberta. Advantages of the new nomenclatural scheme are discussed in the light of future discoveries of plant microfossils, and their application to palaeobotanical and geological problems.

Geodynamic significance of a buried transient Carboniferous landscape

2021 ◽  
Author(s):  
Fergus McNab ◽  
Nicky White
Keyword(s):  
Temperature Anomaly ◽  
Marine Invertebrate ◽  
Grand Canyon ◽  
Indirect Evidence ◽  
Significant Implication ◽  
Dynamic Topography ◽  
Transient Event ◽  
Base Level ◽  
Aeolian Deposits ◽  
Invertebrate Fossils

It is increasingly clear that present-day dynamic topography on Earth, which is generated and maintained by mantle convective processes, varies on timescales and length scales on the order of 1−10 m.y. and 103 km, respectively. A significant implication of this behavior is that Phanerozoic stratigraphic records should contain indirect evidence of these processes. Here, we describe and analyze a well-exposed example of an ancient landscape from the Grand Canyon region of western North America that appears to preserve a transient response to mantle processes. The Surprise Canyon Formation lies close to the Mississippian-Pennsylvanian boundary and crops out as a series of discontinuous lenses and patches that are interpreted as remnants of a westward-draining network of paleovalleys and paleochannels within a coastal embayment. This drainage network is incised into the marine Redwall Limestone whose irregular and karstified upper surface contains many caves and collapse structures. The Surprise Canyon Formation itself consists of coarse imbricated conglomerates, terrestrial plant impressions including Lepidodendron, and marine invertebrate fossils. It is overlain by marine, fluvial, and aeolian deposits of the Supai Group. These stratal relationships are indicative of a transient base-level fall whose amplitude and regional extent are recognized as being inconsistent with glacio-eustatic sea-level variation. We propose that this transient event is caused by emplacement and decay of a temperature anomaly within an asthenospheric channel located beneath the lithospheric plate. An analytical model is developed that accounts for the average regional uplift associated with landscape development and its rapid tectonic subsidence. This model suggests that emplacement and decay of a ∼50 °C temperature anomaly within a channel that is 150 ± 50 km thick can account for the observed vertical displacements. Our results are corroborated by detrital zircon studies that support wholesale drainage reorganization at this time and by stratigraphic evidence for spatially variable regional epeirogeny. They are also consistent with an emerging understanding of the temporal and spatial evolution of the lithosphere-asthenosphere boundary.

Adult Elateridae of Southern Alberta, Saskatchewan and Manitoba (Coleoptera)

1961 ◽  
Vol 93 (S20) ◽  
pp. 5-63
Author(s):  
A. R. Brooks
Keyword(s):  
New Species ◽  
Ecological Regions ◽  
Southern Alberta

AbstractIllustrated keys and descriptions of 26 genera and 137 species or subspecies of Elateridae of southern Alberta, Saskatchewan and Manitoba are presented. The distribution of each species is described in relation to the bio-ecological regions in the three Provinces. No new species are described.

A NEW SPECIES OF PROSIMULIUM FROM ALBERTA (DIPTERA: SIMULIIDAE)

1972 ◽  
Vol 104 (3) ◽  
pp. 289-294 ◽  
Author(s):  
B. V. Peterson ◽  
K. R. Depner
Keyword(s):  
New Species ◽  
Related Species ◽  
Closely Related Species ◽  
Southern Alberta ◽  
A New Species

AbstractProsimulium albertense new species is described from southern Alberta, Canada, and is differentiated from the closely related species P. clavatum Peterson.

scholarly journals Foxed intra- and interspecific differentiation in Leptogorgia (Octocorallia: Gorgoniidae). A description of a new species based on multiple sources of evidence

2017 ◽  
Vol 81 (2) ◽  
pp. 147 ◽  
Author(s):  
M. Mar Soler-Hurtado ◽  
César Megina ◽  
Annie Machordom ◽  
Pablo J. López-González
Keyword(s):  
New Species ◽  
Incomplete Lineage Sorting ◽  
Marine Invertebrate ◽  
Phylogenetic Analyses ◽  
28S Rrna ◽  
Ancestral Polymorphism ◽  
Morphometric Characters ◽  
Pattern Size ◽  
Correlated Characters ◽  
A New Species

The challenges of delimiting and identifying marine invertebrate species impede estimations of true biodiversity. This is particularly true in the case of gorgonian diversity, in which only classical morphological characters (e.g. branching pattern, size and colouration of the colony and sclerites, etc.), which can be homoplastic and continuous, have been used. In this study, using an integrative taxonomic approach, we analysed two morphs initially considered as two eco-typical variants of Leptogorgia alba Duchassaing and Michelotti, 1864, living sympatrically in the littoral area of Ecuador. We explored the use of classical morphological and morphometric characters to delimit species in combination with the analyses of molecular markers (mtMutS, CoxII-Igr-CoxI, ITSs, and 28S rRNA) to infer phylogenetic relationships. Based on our results, two species should be considered, L. alba and a new species, L. manabiensis n. sp., which showed distinguishing morphological features that cannot be attributed to phenotypic plasticity. Both species also showed significant differences in morphometric, non-correlated characters in all size classes. The phylogenetic analyses showed a polyphyletic L. alba - L. manabiensis n. sp. species complex, and ancestral polymorphism and incomplete lineage sorting as possible evolutionary processes leading to this pattern. In conclusion, the combination of morphological and morphometric evidences provides the best support for the identification and delimitation of these challenging species. In addition, molecular analyses, mainly supported by nuclear markers, allow fundamental aspects of the evolutionary history of these organisms to be discerned.

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