Sizing Up the Sub-Tommotian Unconformity in Siberia
| Title: | Sizing Up the Sub-Tommotian Unconformity in Siberia |
| Author: |
Knoll, Andrew; Adams, William; Grotzinger, John P.; Semikhatov, Mikhail A.; Kaufman, Alan J.
Note: Order does not necessarily reflect citation order of authors. |
| Citation: | Knoll, Andrew H., Alan J. Kaufman, Mikhail A. Semikhatov, John P. Grotzinger, and William Adams. 1995. Sizing up the sub-Tommotian unconformity in Siberia. Geology 23, no. 12: 1139-1143. |
| Access Status: | At the direction of the depositing author this work is not currently accessible through DASH. |
| Full Text & Related Files: |
Knoll_SizingUpSub-Tommotian.pdf (367.9Kb; PDF) 
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| Abstract: | Sedimentary rocks in the western Anabar region, northwestern Siberia, preserve an exceptional record of evolution and biogeochemical events near the Proterozoic-Cambrian boundary. Carbon isotopic data on petrographically and geochemically screened samples collected at 1 to 2 m intervals support correlation of the lower Anabar succession (Staraya Reckha and lower Manykai Formations) with sub-Tommotian carbonates of the Ust'-Yu-doma Formation in southeastern Siberia, In contrast, the upper Manykai and most of the overlying Medvezhya Formation appear to preserve a sedimentary and paleontological record of an evolutionarily important time interval represented in southeastern Siberia only by the sub-Tommotian unconformity. Correlation of the Anabar section with other northern Siberian successions that contain well-dated volcanic rocks permits the estimate that the sub-Tommotian unconformity in southeastern Siberia spans approximately 3 to 6 m.y. Diverse small shelly fossils (but not archaeocyathans) previously thought to mark the base of the Tommotian Stage evolved sequentially throughout this earlier interval. |
| Published Version: | http://dx.doi.org/10.1130/0091-7613(1995)023<1139:SUTSTU>2.3.CO;2 |
| Citable link to this page: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:3119537 |
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