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🧑‍🤝‍🧑 A person from Pennsylvania 🦕 A geologic era
Pennsylvanian

Pennsylvanian

9.9
A period long ago when swamp forests made much coal
  • noun
  • /ˌpɛnslˈveɪniən/
  • Specialized
translation icon : período pensilvaniano
  • The lush forests of the Pennsylvanian period created conditions for vast coal formation.

Examples

  • Scientists discovered fossils dating back to the Pennsylvanian in the region’s sedimentary rocks.

  • Coal deposits from the Pennsylvanian provide important clues about Earth’s prehistoric climate.

  • The Pennsylvanian period is known for its vast forests.

  • During the Pennsylvanian, coal deposits were formed.

  • The extensive forests that characterized the Pennsylvanian period were essential for coal formation.

  • Geologists study fossils from the Pennsylvanian era to understand ancient ecosystems.

  • During the Pennsylvanian period, swamps covered much of what is now the eastern United States.

Synonyms

Pennsylvanian period
vsPennsylvanian
  • Specialized
9.2

A time about 323 to 299 million years ago when warm swamps make coal

is the shorter name that omits the explicit time-unit word

Compounds

Pennsylvanian period
  • Specialized
9.2

A time about 323 to 299 million years ago when warm swamps make coal

Surface Forms

Pennsylvanian singular
Pennsylvanians plural

Morphology

Pennsylvanian = Pennsylvania (opaque) = Pennsylvania + ian

Morphologically regular (place name + '-ian'), but the sense refers to a technical geological period named after the region, which is not predictable for average learners.

Etymology

Pennsylvanian as the name for a prehistoric period comes from Pennsylvania because researchers first studied the coal-rich rocks there. The sylvania part comes from Latin silva meaning 'woods' or 'forest', and the period had huge swamp forests that later made coal, so the name reminds us of those ancient forests and coal formation.