During the Pennsylvanian Period, about 286 million to 320 million years ago, rivers and streams flowed into the sea in this area.
(rivers and streams; flowed; into the sea; L:in this area; T:During the Pennsylvanian Period; T:about 286 million to 320 million years ago)
rivers and streams
flowed
into the sea L:in this area T:During the Pennsylvanian Period T:about 286 million to 320 million years ago