Leigh Anne Riedman
University of California,
Santa Barbara, USA; lriedman@ucsb.edu |
Much of my research has involved taxonomic studies of organic-walled microfossil deposited during the high-diversity period of the middle Neoproterozoic (~800 to 730 million years ago), the study of decimated biotas associated with the catastrophic global glaciations of Snowball Earth and the interglacial interval, and a large-scale literature-based study applying a heuristic biostratigraphic program to estimate eukaryotic diversity in the early to middle Neoproterozoic Era. In current projects I have been studying instances of early eukaryotic apatite biomineralization, investigating the apparent connection between taxonomic diversification and a major carbon isotopic anomaly, and reexamining the canonical view of the dependence of eukaryotic diversification upon large-scale ocean oxygenation. As an over-arching goal, I seek to understand the early evolution of eukaryotes and the interactions between the biosphere, lithosphere and atmosphere, particularly during the Mesoproterozoic through early Cambrian time when the supercontinent Rodinia formed and rifted, glaciers covered the Earth quickly melted, oxygen levels rose, eukaryotes diversified and then animals became apparent.
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Cryogenian related publications:
2018 Cohen, P. A., Riedman, L. A., It’s a protist-eat-protist world: recalcitrance, predation, and evolution in the Tonian-Cryogenian oceans, Emerging Topics in Life Sciences. ETLS20170145; doi: 10.1042/ETLS20170145
2018 Porter, S. M., Agić, H., Riedman, L. A., Anoxic ecosystems and early eukaryotes, Emerging Topics in Life Sciences.ETLS20170162; doi: 10.1042/ETLS20170162
2018 Riedman, L. A., Sadler, P. M., Global species richness record and biostratigraphic potential of early to middle Neoproterozoic eukaryote fossils. Precambrian Research. v. 319, pp. 6-18. http://dx.doi.org/10.1016/j.precamres.2017.10.008
2018 Riedman, L. A., Porter, S. M. and Calver, C., Vase-shaped microfossil biostratigraphy with new data from Tasmania, Svalbard, Greenland, Sweden and the Yukon. Precambrian Research. v. 319, pp. 19-36. http://dx.doi.org/10.1016/j.precamres.2017.09.019
2016 Riedman, L. A., Porter, S. M., Organic-walled microfossils of the mid-Neoproterozoic Alinya Formation, Officer Basin, Australia. Journal of Paleontology. v. 90, pp. 854–887.
2016 Porter, S. M., Riedman, L. A., Systematics of organic-walled microfossils from the ~780–740 Ma Chuar Group, Grand Canyon, Arizona. Journal of Paleontology. v. 90, pp. 815–853.
2015 Riedman, L. A., Life during Snowball Earth. AccessScience, McGraw-Hill Education. doi: 10.1036/1097-8542.YB150676.
2014 Riedman, L. A., Porter, S. M., Halverson, G. P., Hurtgen, M. T., Junium, C. K., Organic-walled microfossil assemblages from glacial and interglacial Neoproterozoic units of Australia and Svalbard. Geology v. 42, pp. 1011–1014.
2018 Porter, S. M., Agić, H., Riedman, L. A., Anoxic ecosystems and early eukaryotes, Emerging Topics in Life Sciences.ETLS20170162; doi: 10.1042/ETLS20170162
2018 Riedman, L. A., Sadler, P. M., Global species richness record and biostratigraphic potential of early to middle Neoproterozoic eukaryote fossils. Precambrian Research. v. 319, pp. 6-18. http://dx.doi.org/10.1016/j.precamres.2017.10.008
2018 Riedman, L. A., Porter, S. M. and Calver, C., Vase-shaped microfossil biostratigraphy with new data from Tasmania, Svalbard, Greenland, Sweden and the Yukon. Precambrian Research. v. 319, pp. 19-36. http://dx.doi.org/10.1016/j.precamres.2017.09.019
2016 Riedman, L. A., Porter, S. M., Organic-walled microfossils of the mid-Neoproterozoic Alinya Formation, Officer Basin, Australia. Journal of Paleontology. v. 90, pp. 854–887.
2016 Porter, S. M., Riedman, L. A., Systematics of organic-walled microfossils from the ~780–740 Ma Chuar Group, Grand Canyon, Arizona. Journal of Paleontology. v. 90, pp. 815–853.
2015 Riedman, L. A., Life during Snowball Earth. AccessScience, McGraw-Hill Education. doi: 10.1036/1097-8542.YB150676.
2014 Riedman, L. A., Porter, S. M., Halverson, G. P., Hurtgen, M. T., Junium, C. K., Organic-walled microfossil assemblages from glacial and interglacial Neoproterozoic units of Australia and Svalbard. Geology v. 42, pp. 1011–1014.