5 posts · 3,772 views
Callan Bentley is an assistant professor of geology at Northern Virginia Community College in Annandale, Virginia.
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Mountain Beltway
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- March 8, 2010
- 07:41 AM
- 957 views
When the Sturtian happened
by Callan Bentley in Mountain Beltway
Last Friday, I spent the evening riding up to New York on a bus. To pass the time, I had my iPod and a new paper by Francis Macdonald and colleagues in Science. The paper examines the timing of one of the episodes of “Snowball Earth” glaciation. There’s some important new data in this paper, [...]... Read more »
Macdonald, F., Schmitz, M., Crowley, J., Roots, C., Jones, D., Maloof, A., Strauss, J., Cohen, P., Johnston, D., & Schrag, D. (2010) Calibrating the Cryogenian. Science, 327(5970), 1241-1243. DOI: 10.1126/science.1183325
- April 6, 2010
- 11:17 PM
- 847 views
Suess effect II: corals sing an isotopic song
by Callan Bentley in Mountain Beltway
Almost a year ago, on my old blog, I brought up the issue of the Suess effect. Go read that post if you don’t remember what the Suess effect is. If you want an executive summary, digest this: The burning of low-14C fossil fuels (because the fuels are old and the 14C has all decayed), [...]... Read more »
Peter K. Swart, Lisa Greer, Brad E. Rosenheim, Chris S. Moses, Amanda J. Waite, A. Winter, Richard E. Dodge, & Kevin Helmle. (2010) The 13C Suess effect in scleractinian corals mirror changes in the anthropogenic CO2 inventory of the surface oceans. GEOPHYSICAL RESEARCH LETTERS,. info:/10.1029/2009GL041397.
- March 5, 2010
- 07:15 AM
- 799 views
Is this dike a feeder?
by Callan Bentley in Mountain Beltway
A new paper in the journal Geology examines an interesting question: how can you tell feeder dikes from non-feeder dikes?
The answer is, normally you can’t. Normally, there’s no way to tell for sure whether a given dike actually funneled magma to the paleo-surface, or whether it never reached the paleo-surface. The reason for this is [...]... Read more »
Geshi, N., Kusumoto, S., & Gudmundsson, A. (2010) Geometric difference between non-feeder and feeder dikes. Geology, 38(3), 195-198. DOI: 10.1130/G30350.1
- October 17, 2010
- 05:58 PM
- 655 views
Birthing a litter of drumlins
by Callan Bentley in Mountain Beltway
Quite appropriately, Glacial Till won the new the latest edition of “Where on (Google) Earth?”, hosted here yesterday. The location I picked is the subject of a new paper by Mark Johnson and colleagues appears in the current issue of Geology (October 2010). It shows a place in Iceland where a piedmont-style outlet glacier called [...]... Read more »
Johnson, M., Schomacker, A., Benediktsson, I., Geiger, A., Ferguson, A., & Ingolfsson, O. (2010) Active drumlin field revealed at the margin of Mulajokull, Iceland: A surge-type glacier. Geology, 38(10), 943-946. DOI: 10.1130/G31371.1
- March 13, 2010
- 09:35 AM
- 514 views
AMS Climate briefing rundown
by Callan Bentley in Mountain Beltway
Yesterday I attended a climate change briefing hosted by the American Meteorological Society (in conjunction with NSF, AGU, AAAS, and the American Statistical Association). It was in the Hart Senate Office Building, but I didn’t see any senators at the briefing.
It was an interesting format: 3 talented speakers giving 3 “fifteen-minute” presentations (really more like [...]... Read more »
Solomon, S., Plattner, G., Knutti, R., & Friedlingstein, P. (2009) Irreversible climate change due to carbon dioxide emissions. Proceedings of the National Academy of Sciences, 106(6), 1704-1709. DOI: 10.1073/pnas.0812721106
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