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Showing results for tags 'laurentia'.
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I found this specimen in Laval, on the South shore, West side. There was a fall there, next to the river there is a mixture of different layers. The time should be after Ordovician or late Ordovician. The rock is black, on very thin flat layers. Some layers are very hard / silicates/ other are fragile, mud - coal . Initially I expected it to be nautiloid. But when I did the pictures I rejected it. 1. Both parts 2. 3. 4. Side view - both parts 5. Cleaned (lower part) 6. 7. 8. 9. 10. 11.
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Great Series of Lectures About Snowball Earth, Cryogenian, Including Its Paleobiology
Oxytropidoceras posted a topic in Fossil News
Belo are a great series of lectures (2016) that summarizes what is known and unknown about the Cryogenian. Earth Dynamics Research Group CCFS sponsored short course on Snowball Earth https://www.youtube.com/playlist?list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n Snowball Earth Lecture 1 - Snowball geology Earth Dynamics Research Group https://www.youtube.com/watch?v=RxFmcgjXtgI&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=2 Snowball Earth Lecture 2 - Snowball climate dynamics Earth Dynamics Research Group https://www.youtube.com/watch?v=8ZTR-DaT-w0&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=3 Snowball Earth Lecture 3 - Snowball geochemistry Earth Dynamics Research Group https://www.youtube.com/watch?v=AfC-YRLCKGU&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=4 Snowball Earth Lectures 4&5 - Snowball geobiology & The origin of Laurentia Earth Dynamics Research Group https://www.youtube.com/watch?v=vrjmSVcIGo0&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=5 Snowball Earth Lecture 6 - The Great Oxidation Event and a Siderian snowball earth Earth Dynamics Research Group https://www.youtube.com/watch?v=z2zXLswH02s&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=6 Yours, Paul H.-
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- cryogenian
- geobiology
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Cornwall and south Devon 'originally part of mainland Europe'
Oxytropidoceras posted a topic in Fossil News
Cornwall and south Devon 'originally part of mainland Europe' Study reveals Britain acquired regions when struck by land bearing what is now France, Ima Sample, The Guardian https://www.theguardian.com/science/2018/sep/14/cornwall-and-south-devon-originally-belonged-to-europe The open access paper is: Arjan H. Dijkstra, and Callum Hatch, 2018, Mapping a hidden terrane boundary in the mantle lithosphere with lamprophyres Nature Communications. 9, Article number: 3770 https://www.nature.com/articles/s41467-018-06253-7 Yours, Paul H. -
A volcanic trigger for the Late Ordovician mass extinction? (Open Access PDF)
Oxytropidoceras posted a topic in Fossil News
Interesting open access paper on mass extinctions. Jones, D. S., A. M. Martini, D. A. Fike, and K. Kaiho, 2017, A volcanic trigger for the Late Ordovician mass extinction? Mercury data from south China and Laurentia. Geology v. 45; no. 7; p. 631–634 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7/631 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7 Yours, Paul H. -
Anyone have any information on tectonic activity during the Cambrian Period? I am writing a report on tectonic activity on Earth and am going to use the Cambrian to explain the location of the Burgess Shale and Chengjiang formations. So far I have a good idea of what I am doing, just wanted some input from others. I'll reference anyone that responds. Thanks.
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- burgess shale
- cambrian
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