Original sentence: For much of the Late Ordovician, the Rheic Ocean appears to have widened as fast as today's East Pacific Rise (at 17 cm/year).The Rheic Ocean itself began to close in the Devonian when Gondwana, probably preceeded by terranes that had broken off, drifted towards Laurussia
Edited sentence: For much of the Late Ordovician, the Rheic Ocean appears to have widened as fast as today's East Pacific Rise (at 17 cm/year).The Rheic Ocean itself began to close in the Devonian when Gondwana, probably preceded by terranes that had broken off, drifted towards Laurussia