South from the Adirondack Mountains and the Excellent Upland lies the boundary amongst crystalline and sedimentary rocks; abruptly, anything is different. The core of this sedimentary area—the heartland on the United States—is The good Central Lowland, which stretches for 1,five hundred miles (2,400 kilometres) from Ny to central Texas http://jjpromoter.com/index.php?page=user&action=pub_profile&id=570530