Kasimovian
Proper noun
Meaning
Kasimovian
(geology, paleontology) A subdivision of the Carboniferous period.
Examples
The collapse of the rainforest ecology in the mid Pennsylvanian (between the Moscovian and the Kasimovian) removed many amphibian species that did not survive as well in the cooler, drier conditions.
The Missourian or Monongahela corresponds to the rest of the Kasimovian.