It was part of the ocean. The Eurasian landmass was not yet established and in large parts submerged. The bulk of the landmass of what is now central/eastern As

It was part of the ocean. The Eurasian landmass was not yet established and in large parts submerged. The bulk of the landmass of what is now central/eastern Asia developed during the late carboniferous / early permian era, due to colliding tectonic plates that would form the continent of pangaea.