original: From about 200 to 30 million years ago, the North American Plate was in continual collision with the Farallon Plate.
simplifications: From about 200 to 30 million years ago, the North American Plate was pushing on the Farallon Plate. The North American plate kept hitting the Farallon Plate 20 to 30 million years ago. 200 to 30 million years ago, the North American Plate was constantly crashing with the Farallon Plate. The North American and Farallon Plates were said to have continually collided 30 to 200 million years ago. The North American Plate was constantly colliding with the Farallon Plate 200 to 30 million years ago. From about 200 to 30 million years ago, the North American Plate was constantly colliding with the Farallon Plate. From 200-30 million years ago, the North American Plate kept colliding with the Farallon Plate. Starting 200 to 30 million years ago, the North American Plate has been colliding with the Farallon Plate. From 200 to 30 million years ago, the North American Plate and Farallon Plate were always hitting into each other . Between 200 and 30 million years ago, the North American Plate was in constant collision with the Farallon Plate.