During the middle Ordovician Period ( about 440 - 460 million years ago ) , the tectonic plate carrying this area collided with another plate , leading to the creation of a new subduction zone and the beginning of the Appalachians .
ADP DET ADJ ADJ PROPN ( ADV NUM SYM NUM NUM NOUN ADV ) , DET ADJ NOUN VERB DET NOUN VERB ADP DET NOUN , VERB ADP DET NOUN ADP DET ADJ NOUN NOUN CCONJ DET NOUN ADP DET PROPN .