[cicero2k]

According to this revelation, when a plate sinks well into the abyss of the earth’s core, down 1,200 miles; it retains some of the original structure it had when it was close to the surface. I would have assumed it would have been disolved by then.

The climate and typography assumptions of the Jurassic and earlier remain.

[stormer]

I think what they're looking at is the accretionary wedge at the upper limit of the subduction zone. What they are saying is that rather than than a single subduction zone along the margin of the NA plate, there was also westward movement (from the Juan de Fuca/Farallon spreading center) that accounted for another “left-handed” subduction zone further west that is now being overridden by the NA plate.

[Strategerist]

According to this revelation, when a plate sinks well into the abyss of the earth’s core, down 1,200 miles; it retains some of the original structure it had when it was close to the surface. I would have assumed it would have been disolved by then.

This has been a result of new discoveries, understanding, and modeling over the past decade or so.

I think it's pretty widely believed that subducted slabs are actually hitting the core-mantle boundary, astonishingly.

[Dr. Bogus Pachysandra]

“I would have assumed it would have been disolved by then.”

Yeah! Cuz it’s, like, millions of degrees down there right? Somebody said that.
8^)