What plate tectonic movement is the reason there are seashell fossils found at the top of the Himalayas?

Convergence

Explanation:

Sea shell fossils at the top of the Himalaya could only have one major source, organisms that left behind their shells in a basin.

Tracing the history of the Himalayan mountain range to about 250million years ago. We are presented with an earth made up of a single landmass called the Pangaea. The tethys sea lie in the region of present day Indian ocean.

During the break of Pangea to form the various continents we have today, materials were deposited in the shallow basin of the tethys. These materials accumulated organic life and concentrated fossils. Some sedimentary sequences found on top of the Himalayan range are products of this deposit.

As the plates begins to move and organise, the Eurasia and Indian plates collided at a convergent margin. When two plates of equal densities collide, they lead to a mountain building process. Both plates are uplifted and raised. As they keep grinding, the heights of the range they produce continues it increase.

The uplift which is a product of convergence pushed the accumulated fossils in the basin upward.

This is how the Himalaya became capped with fossils.

The rock that resulted from the collision is a metamorphic rock.

Convergent boundary