Antarctic meteorite might explain mystery of life's weird asymmetry
Monday 24 August 2020
Antarctic meteorite might explain mystery of life's weird asymmetry 24AUG2020
Friday 21 August 2020
Supernova triggers for end-Devonian extinctions 21AUG2020
Supernova triggers for end-Devonian extinctions
Saturday 15 August 2020
Falling Fireballs Crashed in Chile Last Week. They Weren't Meteorites 15AUG2020
Falling Fireballs Crashed in Chile Last Week. They Weren't Meteorites
Saturday 8 August 2020
Did subglacial meltwater create Martian channels and valleys? 08AUG2020
Did subglacial meltwater create Martian channels and valleys?
Early Mars was covered in ice sheets, not
flowing rivers, researchers say
University of British Columbia, August 3, 2020
https://www.sciencedaily.com/releases/2020/08/200803120154.htm
Summary:
"A large number of the valley networks scarring
Mars's surface were carved by water melting
beneath glacial ice, not by free-flowing rivers
as previously thought, according to new research.'
Grau Galofre, A., Jellinek, A.M. & Osinski, G.R,.
2020, Valley formation on early Mars by
subglacial and fluvial erosion. Nature Geoscience, 2020
https://www.nature.com/articles/s41561-020-0618-x
Other recent papers:
Shaw, J., Gilbert, R.G., Sharpe, D.R., Lesemann,
J.E. and Young, R.R., 2020. The origins of s-forms:
Form similarity, process analogy, and links to
high-energy, subglacial meltwater flows.
Earth-Science Reviews, 200, p.102994.
https://www.sciencedirect.com/science/article/pii/S0012825219301710
Rodriguez, J.A.P., Dobrea, E.N., Kargel, J.S., Baker,
V.R., Crown, D.A., Webster, K.D., Berman, D.C.,
Wilhelm, M.B. and Buckner, D., 2020. The Oldest
Highlands of Mars May Be Massive Dust Fallout
Deposits. Scientific reports, 10(1), pp.1-15. Open Access
https://www.nature.com/articles/s41598-020-64676-z
Yours,
Paul H.
Sunday 2 August 2020
Volcanic origin for Younger Dryas geochemical anomalies ca. 12, 900 cal B.P. 02AUG2020
Volcanic origin for Younger Dryas geochemical anomalies ca. 12, 900 cal B.P.