Researchers have discovered an exceptionally preserved fossil site in Massachusetts that provides a rare glimpse into terrestrial life from over 300 million years ago.
The site reveals a diverse ecosystem of early land-dwelling animals and plants from a poorly understood period.
The findings are available in Nature Communications .
320-million-year-old fossil site
The fossil site, called Lantern North, dates to approximately 320-318 million years ago during the early Pennsylvanian period and is located in the Wamsutta Formation of eastern North America.
The site predates many well-known fossil sites from the Coal Age.
Researchers uncovered body and trace fossils of over 130 species, including early reptiles, amphibians , arachnids, insects, and various plant fossils. Many represent some of the oldest known examples of their groups.
The site preserves body fossils and footprints, caves, and other trace fossils that provide insight into animal behaviors and interactions.
The researchers also found evidence of some of the earliest known insect behaviors, including oviposition (egg-laying) and plant galling, which pushes back the fossil record for these activities by millions of years.
Sheds light on early Pennsylvanian life
The Wamsutta Formation in eastern North America has a rich variety of ancient fossils from the Early Pennsylvanian period.
These fossils differ from those found in coal-bearing deposits and are preserved in clastic substrates within basin margin conglomerates.
The well-preserved fossils show a variety of animals, plants, and leaves, with 83 different types of foliage. Plant-insect interactions may provide the earliest evidence of insect oviposition.
The ecosystem represents a drier, upland environment than the coal swamps typically preserved from this period, which provides new perspectives on early terrestrial biodiversity.
“This site gives us an unprecedented look at a terrestrial ecosystem from a crucial time in the evolution of life on land,” said lead author Richard Knecht, a Griffin Graduate School of Arts and Sciences student in the Department of Organismic and Evolutionary Biology.
“We’re seeing evidence of complex plant-insect interactions and some of the earliest appearances of major animal groups that went on to dominate terrestrial habitats.”
The Wamsutta Formation represents deposition in seasonally wet, forested alluvial fan environments near the paleo equator. This setting contrasts with the swampy coal-forming environments that produced most fossil sites of similar age.
“The exceptional preservation of delicate impressions and traces allows us to reconstruct behaviors and ecology in ways not usually possible with body fossils alone,” said co-author Jacob Benner of the University of Tennessee.
“We can see how these early terrestrial communities functioned as integrated ecosystems.”
The researchers note that continued study of the site has the potential to reveal even more about the origins and early evolution of major animal and plant groups and their interactions.
The findings demonstrate the importance of exploring fossil sites beyond the typical swamp environments of the Coal Age to gain a fuller picture of ancient terrestrial ecosystems.
This site helps researchers learn more about early land ecosystems and how different organisms interacted.
It also provides accurate information that will be useful for studying the family trees of important plant, insect, and vertebrate groups in the future.
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