It is once known as the site for prehistoric inhabitants to obtain flint in order to make tools and weapons .
Another natural landmark near the city , the Alibates Flint Quarries National Monument is located 30 miles ( 48 km ) north of Amarillo .
Amarillo is once known as the site for prehistoric inhabitants to obtain flint in order to make tools and weapons .
Another natural landmark near the city , the Alibates Flint Quarries National Monument is located 30 miles ( 48 km ) north of Amarillo .