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Some fossils that were found during the Carboniferous era were Dunbarella, in New Mexico, and then there was Debrya crassa in Arizona and Anthracospirifer, which was found in West Virginia. Mountains like the Himalaya Range of Tibet resulted from the collision of the continents . About 50 million years ago moving tectonic plates brought the continents of Asia and India into contact with one another. Such continental collisions build spectacular mountain ranges. Two rock types make up the lithosphere: oceanic crust and continental crust. Oceanic crust is created by volcanic activity along certain tectonic plate boundaries, and is consumed and recycled along others. Then there’s continental crust, which is composed of material less dense than oceanic crust so that way it floats on the mantle. Spectacular mountains come from the collision of continental curst as tectonic plates collide. This movement is slow- only a few centimeters a year, but these forces are very powerful that some of the largest mountains in the world were created by this process!