Wrong again.

They weren't mentioned because they aren't important.

> Pangea is further back in time and would require further study. We need to firmly establish plate boundaries for that time period and be able to recreate the portions of earth that have since subducted and recycled into the mantle.

In other words, it doesn't fit your guesswork so you're pushing it away.

The reconstruction has been done many times over.

> Pangea could have been only half of the planet's surface and the other half could have been sunk into the earth due to a huge asteroid impact.

Collisions that large would have split the planet. And they don't sink things, they vaporize them.

The fact is that the plates shuffle things endlessly. Pangea may simply have been a time when everything was temporarily shoved together.

Roger