UT Austin Dates Key Tetrapod Fossils to 341 Million Years, Placing Them in Romer's Gap
Updated
Updated · spacedaily.com · Jun 4
UT Austin Dates Key Tetrapod Fossils to 341 Million Years, Placing Them in Romer's Gap
1 articles · Updated · spacedaily.com · Jun 4
Summary
Westlothiana lizziae and related East Kirkton fossils were dated to about 341 ± 3 million years old, roughly 10 million years older than prior estimates and old enough to place them within Romer's Gap.
11 rock samples from the Scottish quarry yielded zircons in six after researchers traced them to sediments washed into limestone from nearby volcanoes, enabling uranium-lead dating where basalt alone had offered little hope.
The study reports a maximum age of 346 million years, while the central estimate comes from seven dates; the authors stress this is a stronger constraint, not a final consensus age.
That shift matters because East Kirkton's seven stem tetrapods now sit inside the poorly documented 360-345 million-year window when vertebrates were moving onto land, giving researchers a firmer timeline for testing environmental explanations.
Could re-dating other fossils with advanced zircon techniques reveal more hidden chapters in the story of life’s transition from water to land?
How might filling Romer's Gap with new fossil dates shift our theories about what drove early tetrapods onto land?
Landmark 346-Million-Year-Old Tetrapod Fossils Fill Romer’s Gap and Redefine the Water-to-Land Transition
Overview
A research team led by Hector Garza has re-dated key tetrapod fossils from Scotland’s East Kirkton Quarry, including Westlothiana lizziae, to 346 million years ago—making them 14–15 million years older than previously thought. This major discovery shifts the timeline for the water-to-land transition in vertebrates and places these fossils within the mysterious 'Romer’s Gap,' a period once thought to lack evidence of early land vertebrates. By filling this gap, the findings provide new insights into how ancient creatures adapted from aquatic to terrestrial environments, offering a clearer picture of a crucial evolutionary step.