Sedimentary rocks found high in the himalayan mountains have been found with fossils of clams and other marine life. what does this indicate about the origin of the himalayan mountains?

 The Earth's crust that formed these mountains was once covered with an ocean

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.