The Early Paleozoic rocks are Cambrian and Ordovician sedimentary rocks interbedded with minor amounts of limestone .
Early Paleozoic , Middle Paleozoic , Cretaceous , and Neogene rocks have been mapped within the De Long Islands .
The Early Middle Paleozoic rocks are Cambrian and Ordovician sedimentary rocks interbedded with minor amounts of limestone .
Early Paleozoic , Middle Paleozoic , Cretaceous , and Neogene rocks have been mapped within the De Long Islands .