It will also be available virtually, via Zoom. If you come to the Cosmos Club remember to bring your Covid vaccination card. It will be checked before admission. And don’t forget to save some room for the beer. We have a full program of three talks, including a talk about how water and other volatiles affects the behavior of silicic magmatic systems, then a behind-the-scenes look at the daily news process at National Geographic, and finally a presentation on the ‘original arms-race’ about how arms developed in the ancient forerunners of mammals. Contact Michael Ackerson (ackersonm[at]si.edu) for the Zoom link if you do not have it.
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Here in the Tonga Trench, the 1st sighting of the deepest-living Bigfin Squid, genus Magnapinna. Note the distinctive elbow-like bend in the extremely long arms & tentacles. #HadalZone #ExtremeHabitat
Face-to-face with a Bigfin Reef Squid 🦑✨ Just enough time to snap some macro shots before it swam off. Underwater magic captured by John Roney! 🎥: roneydives IG
Gasp! Now that's what we call a xenolith!
American Mineralogist:
Tetrahedral aluminum in tourmaline from a spinel-pargasite-metamorphosed mafic-ultramafic rock
By Oleg S. Vereshchagin, et al.
https://doi.org/10.2138/am-2023-9170
The formation of these tourmalines requires: (1) desilication of primary rocks and (2) high T and P.A ShakeMap shows the ground shaking caused by an earthquake. This map from the @cageosurvey compiles all the ShakeMaps generated from 1981 - 2023 for earthquakes of magnitude 4+! https://www.conservation.ca.gov/cgs/documents/publications/map-sheets/MS_067-Cumulative-ShakeMap-2024-a11y.pdf