by neufer » Tue Apr 03, 2018 6:58 pm
rstevenson wrote: ↑Tue Apr 03, 2018 6:42 pm
Chris Peterson wrote: ↑Tue Apr 03, 2018 4:57 am
APOD Robot wrote: ↑Tue Apr 03, 2018 4:05 am
How these ancient 40-meter high
pillars formed is yet unknown.
I don't think that's really true. Structures like this exist around the world, and their formation is at least broadly understood as the result of weathering and erosion of softer surrounding material. That schists like this form in narrow columns and dikes in not unusual, given the nature of geological metamorphosis.
A paragraph from the
Manpupuner Rock Formations wikipedia page seems to address this, at least in part...
About 200 million years ago on the place of stone pillars were high mountains. Rain, snow, wind, frost and heat gradually destroyed mountains and, in the first place, weak rocks. Solid sericite-quartzite schists, from which the remains are composed, were destroyed less and survived to this day, and soft rocks were destroyed by weathering and carried down by water and wind in relief depressions.
https://en.wikipedia.org/wiki/United_States_Postal_Service_creed wrote:
<<The words "
Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds" have long been associated with the American postman. The motto is inscribed on New York's James Farley Post Office in New York City, facing Penn Station, but it has no official status. The phrase was a translation by Prof. George Herbert Palmer, Harvard University, from an ancient Greek work of Herodotus describing the angarium, the ancient Persian system of mounted postal carriers c. 500 B.C.:
It is said that as many days as there are in the whole journey, so many are the men and horses that stand along the road, each horse and man at the interval of a day’s journey; and these are stayed neither by snow nor rain nor heat nor darkness from accomplishing their appointed course with all speed. — Herodotus, Histories (8.98) (trans. A.D. Godley, 1924)>>
[quote=rstevenson post_id=281212 time=1522780977 user_id=124801]
[quote="Chris Peterson" post_id=281197 time=1522731446 user_id=117706]
[quote="APOD Robot" post_id=281196 time=1522728346 user_id=128559]
How these ancient 40-meter high [url=https://www.youtube.com/watch?v=KlKGmmCTJVk]pillars[/url] formed is yet unknown.
[/quote]
I don't think that's really true. Structures like this exist around the world, and their formation is at least broadly understood as the result of weathering and erosion of softer surrounding material. That schists like this form in narrow columns and dikes in not unusual, given the nature of geological metamorphosis.
[/quote]
A paragraph from the [url=https://en.wikipedia.org/wiki/Manpupuner_rock_formations]Manpupuner Rock Formations[/url] wikipedia page seems to address this, at least in part...[quote]About 200 million years ago on the place of stone pillars were high mountains. [b][color=#0000FF][i]Rain, snow, wind, frost and heat[/i][/color][/b] gradually destroyed mountains and, in the first place, weak rocks. Solid sericite-quartzite schists, from which the remains are composed, were destroyed less and survived to this day, and soft rocks were destroyed by weathering and carried down by water and wind in relief depressions.[/quote][/quote][quote=" https://en.wikipedia.org/wiki/United_States_Postal_Service_creed"]
<<The words "[b][color=#0000FF][i]Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds[/i][/color][/b]" have long been associated with the American postman. The motto is inscribed on New York's James Farley Post Office in New York City, facing Penn Station, but it has no official status. The phrase was a translation by Prof. George Herbert Palmer, Harvard University, from an ancient Greek work of Herodotus describing the angarium, the ancient Persian system of mounted postal carriers c. 500 B.C.: [b][color=#0000FF][i]It is said that as many days as there are in the whole journey, so many are the men and horses that stand along the road, each horse and man at the interval of a day’s journey; and these are stayed neither by snow nor rain nor heat nor darkness from accomplishing their appointed course with all speed.[/i][/color][/b] — Herodotus, Histories (8.98) (trans. A.D. Godley, 1924)>>[/quote]