the dunesland heritage of illinois latf cretaceous eocene fig 9maps of north america at various times in the post showing the differences in the exposed land areas in all four maps the stippled areas represent oceans the white and striped parts represent land although these maps do not show all the known details they present moderately accurate pictures of the geography of the various times they do not by any means show all the changes that took place in the physiography they ore simply a set of samples showing the physiography at the following times late cambrian about 500 mil mab068.jpg from 语音聊天软件开发价钱低飞机：@kxkjww @kxkjrj） latf View Photo