1. An epoch in the Pennsylvanian, dated at 303–295.1 Ma ( Harland et al. 1989) comprising the Krevyakinskian, Chamovnicheskian, and Dorogomilovskian Ages (these are also stage names in eastern European stratigraphy). The Kasimovian is preceded by the Moscovian and followed by the Gzelian Epochs.
2. The name of the corresponding eastern European series, which is roughly contemporaneous with part of the Stephanian (western Europe), and the Missourian and lower Virgilian (N. America).
"Kasimovian." A Dictionary of Earth Sciences. . Encyclopedia.com. (April 25, 2019). https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/kasimovian
"Kasimovian." A Dictionary of Earth Sciences. . Retrieved April 25, 2019 from Encyclopedia.com: https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/kasimovian