Ordovician and Silurian graptolite succession in the Trail Creek area, central Idaho--a graptolite zone reference section /

Autor Carter, Claire, Churkin, Michael, 1932-
Vydáno 1977

Stratigraphy, structure, and graptolites of an Ordovician and Silurian sequence in the Terra Cotta Mountains, Alaska Range, Alaska /

Autor Churkin, Michael, 1932-, Carter, Claire
Vydáno 1996

Early Silurian graptolites from southeastern Alaska and their correlation with graptolitic sequences in North America and the Arctic /

Autor Churkin, Michael, 1932-, Carter, Claire
Vydáno 1970