Next Article in Journal
Acknowledgement to Reviewers of Geosciences in 2016
Previous Article in Journal
Anomaly Detection from Hyperspectral Remote Sensing Imagery
Article Menu

Export Article

Open AccessArticle
Geosciences 2016, 6(4), 57; doi:10.3390/geosciences6040057

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

1
Department of Earth and Environmental Sciences, Brooklyn College, Brooklyn, NY 11210, USA
2
PhD Programs in Earth and Environmental Science and Biology, City University of New York, Graduate Center, New York, NY 10016, USA
3
Department of Biology, College of Staten Island, Staten Island, NY 10314, USA
4
Department of Environmental Sciences, William Paterson University, Wayne, NJ 07470, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Olaf Lenz and Jesus Martinez-Frias
Received: 12 September 2016 / Revised: 9 December 2016 / Accepted: 13 December 2016 / Published: 19 December 2016
View Full-Text   |   Download PDF [6457 KB, uploaded 19 December 2016]   |  

Abstract

Sphaeromorphic algal cysts, most probably of the prasinophyte Tasmanites, and acanthomorphic acritarch vesicles, most probably Solisphaeridium, occur in a single 20 cm thick bed of micritic limestone in the lower part of the Middle Devonian (Givetian) Tully Formation near Lock Haven, Pennsylvania. Specimens are composed of authigenic calcite and pyrite crystals about 5–10 µm in length. Some specimens are completely calcitic; some contain both pyrite and calcite; and many are composed totally of pyrite. The microfossils are about 80 to 150 µm in diameter. Many show signs of originally containing a flexible wall composed of at least two layers. Some appear to have been enclosed in a mucilaginous sheath or membrane when alive. The acanthomorphic forms have spines that are up to 20 µm in length, expand toward the base, and are circular in cross-section. The microflora occurs with microscopic molluscs, dacryoconarids, the enigmatic Jinonicella, and the oldest zooecia of ctenostome bryozoans known from North America. The microalgal horizon lacks macrofossils although small burrows are present. Microalgae and acritarchs have been preserved via a complex preservational process involving rapid, bacterially-mediated post-mortem mineralization of dead cells. The microfossil horizon, and possibly much of the Tully Formation at Lock Haven with similar lithology, formed in a relatively deep, off-shore basin with reduced oxygen availability in the substrate. View Full-Text
Keywords: microalgae; acritarchs; Jinonicella; ctenostome zooecia; Tully Formation; Givetian; Pennsylvania microalgae; acritarchs; Jinonicella; ctenostome zooecia; Tully Formation; Givetian; Pennsylvania
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Chamberlain, J.A.; Chamberlain, R.B.; Brown, J.O. A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA. Geosciences 2016, 6, 57.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top