What is another word for Pennsylvanian Period?
Pronunciation: [pˌɛnsɪlvˈe͡ɪni͡ən pˈi͡əɹɪəd] (IPA) 
The Pennsylvanian Period, which lasted from approximately 323 to 298 million years ago, was a time of significant geological and biological change. This period is also known by several other names such as the Upper Carboniferous, the Coal Measures, and the Alleghenian. It is characterized by the appearance of a wide range of plant and animal life, including the emergence of insects, amphibians, and reptiles. The name "Pennsylvanian" comes from the fact that much of the rock formations from this period are found in the state of Pennsylvania in the eastern United States. Other terms used to describe this geological period include the Gzhelian, Kasimovian, and Bashkirian stages, which are based on regional variations in rock layers and fossils.
