 The summit of Big Pocono "Mountain" is actually nearly level with land to the west and northwest, together comprising the top of the Glaciated Pocono Plateau, which is part of the larger Allegheny Plateau.The Pocono Plateau, a distinctive geologic feature not to be confused with the larger Pocono Mountains, is a glaciated plateau formed during at least three glacial movements.As glaciers moved south from Canada, they scraped flat what is now the plateau.