Ancient reptiles 'make tracks'

Jul 29, 2010
Ancient reptiles conquer continental interiors. Credit: © James Robins

A new discovery of fossilized footprints reveals when reptiles first conquered dry land.

The 318-million-year-old reptile footprints were found in sea-cliffs on the Bay of Fundy, New Brunswick, Canada. They show that were the first vertebrates (animals with a backbone) to conquer dry continental interiors. These pioneers paved the way for the diverse ecosystems that exist on land today.

The footprints were discovered by Dr Howard Falcon-Lang of Royal Holloway, University of London. The results of his study, undertaken with Professor Mike Benton of the University of Bristol and Canadian colleagues, are published today in the journal Palaeogeography, Palaeoclimatology, Palaeoecology.

It has long been suspected that reptiles were the first to make the continental interiors their home. This is because reptiles do not need to return to water to breed unlike their amphibian cousins. The new discovery of footprints proves this theory. The rocks in which they occur show that the reptiles lived on dry river plains hundreds of miles from the sea.

Professor Benton said: "The footprints date from the when a single supercontinent (Pangaea) dominated the world. At first life was restricted to coastal swamps where lush rainforest existed, full of giant ferns and dragonflies. However, when reptiles came on the scene they pushed back the frontiers, conquering the dry continental interiors."

These are tetrapod trackways discovered in Nova Scotia by Dr. Howard Falcon-Lang, Royal Holloway, University of London. The trackways are the subject of research by Dr. Falcon-Lang and colleagues at the University of Bristol, UK, published this week in Palaeo-3. Credit: courtesy of Dr Howard Falcon-Lang

The same team reported the oldest known reptile from a different site in New Brunswick in 2007. The new discovery is of similar age, and may be even older.

Dr Falcon-Lang added: "The Bay of Fundy is such an amazing place to hunt for fossils. The sea-cliffs are rapidly eroding and each rock-fall reveals exciting new fossils. You just never know what will turn up next."

Explore further: Remains of French ship being reassembled in Texas

Related Stories

Earliest evidence for reptiles

Oct 17, 2007

Newly discovered fossilised footprints provide the earliest evidence yet for the evolution of reptiles – a major event in the history of life. They are 315 million years old, making reptiles up to 3 million ...

Ancient rainforests resilient to climate change

Oct 01, 2009

(PhysOrg.com) -- Climate change wreaked havoc on the Earth’s first rainforests but they quickly bounced back, scientists reveal today. The findings of the research team, led by Dr Howard Falcon-Lang from ...

Ancient Amphibians Left Full-Body Imprints

Oct 29, 2007

Unprecedented fossilized body imprints of amphibians have been discovered in 330 million-year-old rocks from Pennsylvania. The imprints show the unmistakably webbed feet and bodies of three previously unknown, ...

Recommended for you

Remains of French ship being reassembled in Texas

44 minutes ago

A frigate carrying French colonists to the New World that sank in a storm off the Texas coast more than 300 years ago is being reassembled into a display that archeologists hope will let people walk over ...

User comments : 0