Tuesday, September 08, 2015
Southwest from where Doc Livingstone was found
The grand conglomerate caps old black shales.
The rhenium, in micro-pyrite bound,
Can date when diamictite ice prevails.
The wild’s call, beyond the Yukon Gold
Hides ancient glaciation in the wilds.
To test the Snowball Earth, we ask, “How old”
These jigsaw continents, frozen or mild?
Just past the pleasure dome of Kublai Khan
Mongolia preserves more ancient rock
The age determination’s not forgone
We must assess the isotopic clock.
For fifty million years, and then for five,
The planet froze, yet somehow stayed alive.