1. Evan Kelly Modern analogs for ancient transpressional basin sedimentary deposits

2. ● The Walden Creek Group ● Stratigraphy ● Olistostrome definition ● Tectonic Setting? ● Modern transtensional basins ● Sea of Marmara ● Korea ● Baja California ● Conclusions: do they match? Outline

3. Wilhite – 1000 m sandy silt/cgl carbonate olistostromes Shields- 750 m white pbl cgl + lenses course ss Licklog – 100 m siltstone / shale Walden Creek Group – Blue Ridge

4. An accumulation of submarine gravity flows as (semi-fluid bodies) Lack true bedding, yet are intercalated between normal sedimentary bedding sequences. Olistostromes http://bio-geo-terms.blogspot.com/2006/12/mlange.html http://en.wikipedia.org/wiki/File:Olistolite_Western_Serbia.JPG

5. Wilhite – fossils in olistostromes Walden Creek Group: Age Unrug et al 2000

6. Wu et al. 2009

7. Modern Transtensional Basins ● Sea of Marmara ● Korea ● Gulf of California http://statelibrary.ncdcr.gov/colls/themes/april.html

8. Anatolia http://en.wikipedia.org/wiki/North_Anatolian_Fault Carton et al. 2007

9. Anatolia http://en.wikipedia.org/wiki/North_Anatolian_Fault Carton et al. 2007

10. Anatolia – Sea of Marmara Wong et al 1995

11. Anatolia – Sea of Marmara Wong et al 1995

12. Anatolia – Sea of Marmara Wong et al 1995

13. South Korea Chough et al. 2010

14. S. Korea - Eumsung Basin SW SE

15. Gulf of California

16. Gulf of CA - San Jose Island Umhoefer et al. 2007

17. Conclusions/Further Issues ● Basin geometry is central to the expected facies patterns in transtensional basins ● Olistostromes reasonable IF rapid change in fault offset ● Otherwise, don't match other megabreccias ● On what was WCG deposited? ● How much of WCG is missing?

18. ● Carton, H., Singh, S.C., Hirn, A., Bazin, S., de Voogd, B., Vigner, A., Ricolleau, A., Cetin, S., Ocakoglu, N., Karakoc, F., Sevilgen, V., 2007. Seismic imaging of the three-dimensional architecture of the Cinarcik Basin along the North Anatolian Fault. Journal of Geophysical Research 112, 1-17. ● Ryang, W.H., 2003. Contrasting basin fills in a strike-slip setting, Eumsung Basin, Korea. Geosciences Journal 7, 263-275. ● Ryang, W.H., Chough, S.K., 1999. Alluvial-to-lacustrine systems in a pull-apart margin: southwestern Eumsung Basin, Korea. Sedimentary Geology 127, 31-46. ● Umhoefer, P.J., Schwennicke, T., Del Margo, M.T., Ruiz-Geraldo, G., Ingle, J.C.J., McIntosh, W., 2007. Transtensional fault-termination basins: an important basin type illustrated by the Pliocene San Jose Island basin and related basins in the southern Gulf of California, Mexico. Basin Research 19, 297-322. ● Unrug, R., Ausich, W.I., Bednarczyk, J., Cuffey, R.J., Mamet, B.L., Palmes, S.L., Unrug, S., 2009. Paleozoic age of the Walden Creek Group, Ocoee Supergroup, in the western Blue Ridge, southern Appalachians: Implications for evolution of the Appalachian margin of Laurentia. Geological Society of America Bulletin 112, 982-996. ● Wong, H.K., Ludmann, T., Ulug, A., Gorur, N., 1995. The Sea of Marmara: a plate boundary sea in an escape tectonic regime. Tectonophysics 244, 231-250. ● Wu, J.E., McClay, K., Whitehouse, P., Dooley, T., 2009. 4D analogue modelling of transtensional pull-a-apart basins. Marine and Petroleum Geology 26.8, 1608-1623. References