Pennsylvania

Its overhanging upper floor came from Alpine Europe, not from Pennsylvania.

Settlers from German-speaking Europe built these bank barns across southeastern Pennsylvania from the eighteenth century, carrying an Alpine and Rhineland form across the Atlantic. The type spread down the Appalachians and into Ontario, taking Pennsylvania's name far outside the state.

North America cut the Carboniferous in half and named the halves after a state and a river.

Henry Shaler Williams coined Pennsylvanian in 1891 for the upper Carboniferous strata that are well exposed in Pennsylvania and hold its coal. It pairs with the Mississippian below, named in 1870 for limestone along the upper Mississippi valley. The division began as a convenience for American geologists working with rocks that looked nothing like the European sequence, and the International Commission on Stratigraphy has since made the two formal global subperiods.