Search

Your search keyword '"Saarina"' showing total 4 results
Start Over Descriptor "Saarina"
4 results on '"Saarina"'

1. A new cloudinid fossil assemblage from the terminal Ediacaran of Nevada, USA.

Author

Selly, Tara, Schiffbauer, James D., Jacquet, Sarah M., Smith, Emily F., Nelson, Lyle L., Andreasen, Brock D., Huntley, John Warren, Strange, Michael A., O'Neil, Gretchen R., Thater, Casey A., Bykova, Natalia, Steiner, Michael, Yang, Ben, and Cai, Yaoping

Subjects
*FOSSILS, *CAMBRIAN Period, *EDIACARAN fossils
Abstract

Owing to their temporal position during the decline of the classic Ediacara biota and the appearance of the more recognizable metazoans of the Cambrian Period, the terminal Ediacaran (∼551–539 Ma) assemblages of tubular fossil forms hold potential to improve understanding of biotic turnover near the end of the Ediacaran Period. Cloudinid taxa, including the terminal Ediacaran index fossil Cloudina, are the most well studied of these Ediacaran tubular forms due to their global palaeogeographical distribution. Recent reports revealed ecosystems of tubicolous organisms from the Great Basin region, Nevada, USA, and assigned taxa to such genera as Conotubus, Gaojiashania and Wutubus, well known from contemporaneous Chinese deposits. Appreciating the role that these organisms may have played in the evolutionary history of metazoans and recognizing their potential global distribution, however, requires careful taxonomic study. Here, we detail pyritized fossils from the Deep Spring and Wood Canyon formations of Esmeralda and Nye counties, Nevada, USA, respectively. Our investigation focused on the most abundant tubular taxon from the Nevada sites, which was previously generically assigned to Conotubus. While outwardly similar in morphology to this Gaojiashan taxon, our investigation determines that those fossils previously figured as Conotubus are instead two distinct taxa. The first represents a new species of Saarina – Saarina hagadorni sp. nov. – a genus previously known only from the East European platform, and the second is established as a novel genus and species, Costatubus bibendi gen. et sp. nov. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

2. A new cloudinid fossil assemblage from the terminal Ediacaran of Nevada, USA

Author

Tara Selly, Michael A. Strange, Emily F. Smith, James D. Schiffbauer, Lyle L. Nelson, Michael Steiner, Yaoping Cai, Gretchen R. O'Neil, Natalia Bykova, John Warren Huntley, Sarah M. Jacquet, Ben Yang, Brock D. Andreasen, and Casey A. Thater

Subjects
0106 biological sciences, 010506 paleontology, biology, Paleontology, Saarina, Biota, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Terminal (electronics), Period (geology), Assemblage (archaeology), Geology, 0105 earth and related environmental sciences
Abstract

Owing to their temporal position during the decline of the classic Ediacara biota and the appearance of the more recognizable metazoans of the Cambrian Period, the terminal Ediacaran (∼551–539 Ma) ...

Published
2019

3. New Vendian Saarinid Microorganisms from the Siberian Platform

Author

L. S. Sofroneeva and P. N. Kolosov

Subjects
biology, 05 social sciences, Paleontology, Saarina, 050905 science studies, 010403 inorganic & nuclear chemistry, biology.organism_classification, 01 natural sciences, Incertae sedis, 0104 chemical sciences, Genus, 0509 other social sciences, Geology
Abstract

Vendian (Ediacaran) tubiform organic-walled segmented microfossils from the East Siberian Platform, with no biological interpretation, were previously assigned to the Incertae sedis genus Kursovia Kolosov et Rudavskaja, 1984 and identified as Kursovia sp. 4. The re-examination of these fossils showed that these are new saarinid microorganisms that resemble Saarina juliae in the tubiform shape, segmented structure, presence of crenulae on free (upper) edge of segments and in the prominence of these features, but are smaller by one–two orders of magnitude. They are herein assigned to a new genus and species Saarinomorpha infundibularis Kolosov et Sofroneeva, gen. et sp. nov. in the family Saarinidae Sokolov, 1965.

Published
2018

4. Proterozoic and Earliest Cambrian Carbonaceous Remains, Trace and Body Fossils

Author

Stefan Bengtson, Hans J. Hofmann, Mikhail A. Fedonkin, Carol Mankiewicz, Bruce Runnegar, and Kenneth M. Towe

Subjects
Paleontology, Geography, biology, Ausia, Trilobozoa, Saarina, Ediacaria, Parvancorina, Trace fossil, Cyclomedusa, biology.organism_classification, Grypania
Abstract

This Chapter deals with the records of all of the Proterozoic fossil finds which are not included among the prokaryotic or protistan fossils dealt with in Chapter 5. In general, therefore, Chapter 7 deals with the earliest fossil records of higher organisms on earth. However, where systematic assignment is subject to debate there is unavoidable overlap with the prokaryotes and protists. In historical perspective, publications describing presumed Precambrian megafossils of various kinds go back more than 100 years. Reports of carbonaceous films appeared as early as 1854 (Eichwald 1854). “Trace fossil” descriptions date from 1866 (Dawson 1866), and “body fossils” from 1872 (Billings 1872a, b). Related to the now-famous Ediacaran faunas, the first unequivocal megafossil to be described was that of Rangea schneiderhohni reported by G. Gurich in 1930 from rocks in southwest Africa. Since these early reports, hundreds of widely, if not universally accepted Proterozoic megafossils have been described from around the world. This record of Proterozoic megafossil remains is therefore not without its share of problems which are similar to those associated with the phylogenetically lower organisms described in Chapter 5. These problems include decisions regarding biogenicity and fossil syngenicity, as well as doubts about geologic age. There are disparate taxonomic judgments, including the differing environmental and/or evolutionary interpretations such judgments may engender. In some instances the reasoning may be circular.

Published
1992

Catalog

Books, media, physical & digital resources
See catalog results