| original |
Middle Ordovician |
|
Oklahoma |
Grahn,Y. et al. Chitinozoa from the Middle Ordovician Bromide Formation, Arbuckle Mountain, Oklahoma, USA. |
1986 |
| details |
Late Chazyan |
Blackriveran |
Oklahoma |
Derby,J.R. et al. Biostratigraphy of the Timbered Hills, Arbuckle and Simpson Groups, Cambrian and Ordovician, Oklahoma; A review of correlation tools and techniques available to the explorationist. (In: Late Cambrian Ordovician Geology of the Southern Midcontinent, 1989 Symposium. K.S. Johnson, editor) |
1991 |
| details |
Middle Ordovician |
|
Oklahoma |
Miller,M.A. Chitinozoa. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |