A coastal plain is an area of flat, low-lying land adjacent to a seacoast and separated from the interior by other features. One of the world's longest coastal plains is located in eastern South America. The southeastern coastal plain of North America is notable for its species diversity. The Gulf Coastal Plain of North America extends northwards from the Gulf of Mexico along the Lower Mississippi River to the Ohio River, which is a distance of about 500 miles (about 800 km). During the Cretaceous period, the central area of the United States was covered by a shallow sea, which disappeared as the land rose. Large fossilized aquatic birds called Hesperornis and Ichthyornis, found in western Kansas, indicate that the shallow sea was rife with fish.
Famous quotes containing the word plain:
“O, pluck was he to the backbone and clear grit through and through;
Boasted and bragged like a trooper; but the big words wouldn’t do;
The boy was dying, sir, dying, as plain as plain could be,
Worn out by his ride with Morgan up from the Tennessee.”
—Constance Fenimore Woolson (1840–1894)