The world\u2019s oldest known fossil forest has been discovered in a sandstone quarry in New York state, offering new insights into how trees transformed the planet.<\/p>\n
The forest, found in the town of Cairo, would have spanned from New York to Pennsylvania and beyond, and has been dated to about 386m years old. It is one of only three known fossil forests dating to this period and about 2-3m years older than the previously oldest known fossil forest at Gilboa, also in New York state.<\/p>\n
\u201cThese fossil forests are extremely rare,\u201d said Chris Berry from Cardiff University\u2019s School of Earth and Ocean Sciences. \u201cTo really understand how trees began to draw down carbon dioxide from the atmosphere, we need to understand the ecology and habitats of the very earliest forests.\u201d<\/p>\n
The forest would have been quite open and its ancient trees would appear alien to the modern eye. A walker would have encountered clusters of Cladoxylopsid, a 10m-tall leafless tree with a swollen base, short branches resembling sticks of celery and shallow, ribbon-like roots. The fossils also revealed a tree called Archaeopteris, something like a pine, but instead of needles the branches and trunk were adorned with fern-like fronds, giving it an almost hairy appearance. \u201cIt\u2019s not something we can immediately recognise as a modern tree,\u201d said Berry.<\/p>\n
Archaeopteris also featured enormous woody roots, which had not previously been seen in forests of this era.<\/p>\n
The prehistoric forest would have been sparse on wildlife. The first dinosaurs would only appear 150m years later and there were no vertebrates on land yet and no birds. The forest\u2019s primary occupants were millipede-like creatures, called myriapods, and some other primitive insects that may or may not have begun to fly.<\/p>\n
\u201cIt\u2019s funny to think of a forest without large animals. No birdsong. Just the wind in the trees,\u201d said Berry.<\/p>\n
The emergence of forests is one of the most transformative events in Earth\u2019s history, marking permanent changes to ecology, atmospheric CO2 levels and climate. Before forests, CO2 levels were far higher and the Earth\u2019s climate was hotter with no ice caps. By the end of the Devonian period, about 350m years ago, there were glaciers and, soon after, polar ice became permanent.<\/p>\n
However, there have been so few fossil remains of early trees that scientists have had only a hazy idea of which trees dominated which habitats, how root systems altered soil chemistry and how forests opened up new ecological niches for animals.<\/p>\n
\u201cThese remarkable findings have allowed us to move away from the generalities of the importance of large plants growing in forests,\u201d said Berry. \u201cWe are really getting a handle on the transition of the Earth to a forested planet.\u201d<\/p>\n
Today, forests cover about 30% of the planet and are being cleared on a massive scale. Between 1990 and 2016, the world lost 502,000 square miles of forest, according to the World Bank \u2013 an area larger than South Africa \u2013 and about 17% of the Amazon rainforest has been cleared over the past 50 years. Even without accounting for the impact of burning fossil fuels, deforestation could lead to profound changes to the world\u2019s ecosystem and climate. \u201cIf you reverse that process [of forestation] you probably lose the ice,\u201d said Berry.<\/p>\n","protected":false},"excerpt":{"rendered":"
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