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From the mid-Givetian Age onwards, lignophyte flora are known to have been key parts of the machinery in the so-called Devonian landscape factory, but the impact of earlier forests, dominated by less woody cladoxylopsids, are not as well understood. We report here evidence for a previously unrecognized cladoxylopsid forest landscape, archived within the Eifelian Hangman Sandstone Formation of Somerset and Devon, SW England. This unit has previously been considered palaeobotanically depauperate, but is here shown to contain the earliest fossil evidence for such trees in the British record, as well as the oldest known evidence globally for the relative position of standing trees: in common parlance, a fossil forest. In addition to abundant fossil material attributable to the cladoxylopsid tree\n            <jats:italic>Calamophyton<\/jats:italic>\n            , and other early Mid-Devonian flora, the sedimentary context of the plant remains sheds light on the biogeomorphic impacts of these earliest forests. The trees colonized a sizeable distributive fluvial system that was prone to seasonal disturbance events. The nature of the sedimentary system has created a bias to those facies where biogeomorphic signatures are most frequently recorded (from the distal parts of the system), but across the whole system there is evidence of plant\u2013sediment interactions in the form of vegetation-induced sedimentary structures, rooting features and accumulations of plant debris. Plant remains are also found in nearshore facies adjacent to the distributive fluvial system, attesting to the development of a novel non-marine\/marine teleconnection from the production and export of new biological sedimentary particles. The Hangman Sandstone Formation is illustrative of the revolutionary power of cladoxylopsid trees as biogeomorphic agents, forming densely spaced forests and shedding exceptionally abundant plant debris, while also impacting local landforms and sediment accumulations and profoundly changing landform resilience against flood disturbance events. These findings provide evidence that the Eifelian Stage (393.3\u2013387.7\u2005Ma) marks the onset of tree-driven changes to physical environments that would forever change Earth's non-marine landscapes and biosphere.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material:<\/jats:bold>\n            Details of sedimentary facies and additional images of plant fossils are available at\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" specific-use=\"dataset is-supplemented-by\" xlink:href=\"https:\/\/doi.org\/10.6084\/m9.figshare.c.7084873\">https:\/\/doi.org\/10.6084\/m9.figshare.c.7084873<\/jats:ext-link>\n          <\/jats:p>","DOI":"10.1144\/jgs2023-204","type":"journal-article","created":{"date-parts":[[2024,2,23]],"date-time":"2024-02-23T10:03:28Z","timestamp":1708682608000},"update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":20,"title":["Earth's earliest forest: fossilized trees and vegetation-induced sedimentary structures from the Middle Devonian (Eifelian) Hangman Sandstone Formation, Somerset and Devon, SW England"],"prefix":"10.1144","volume":"181","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0910-8283","authenticated-orcid":true,"given":"Neil S.","family":"Davies","sequence":"first","affiliation":[{"name":"Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK"}]},{"given":"William J.","family":"McMahon","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK"}]},{"given":"Christopher M.","family":"Berry","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Cardiff University, Park Place, Cardiff CF10 3AT, UK"}]}],"member":"1881","published-online":{"date-parts":[[2024,4,18]]},"reference":[{"key":"e_1_3_6_2_1","doi-asserted-by":"publisher","DOI":"10.1127\/1860-1804\/2009\/0160-0001"},{"key":"e_1_3_6_3_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1755691018000695"},{"key":"e_1_3_6_4_1","doi-asserted-by":"crossref","unstructured":"Allen J.P. and Gastaldo R.A. 2006. Sedimentology and taphonomy of the Early to Middle Devonian plant-bearing beds of the Trout Valley Formation Maine. GSA Special Papers 399 https:\/\/doi.org\/10.1130\/2006.2399(03)","DOI":"10.1130\/2006.2399(03)"},{"key":"e_1_3_6_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/sed.12102"},{"key":"e_1_3_6_6_1","first-page":"65","article-title":"Old Red Sandstone facies in external basins, with particular reference to southern Britain","volume":"23","author":"Allen J.R.L.","year":"1979","unstructured":"Allen, J.R.L. 1979. Old Red Sandstone facies in external basins, with particular reference to southern Britain. Special Papers in Palaeontology, 23, 65\u201380.","journal-title":"Special Papers in Palaeontology"},{"key":"e_1_3_6_7_1","volume-title":"Sedimentary Structures, their Character and Physical Basis. Vol. 2","author":"Allen J.R.L.","year":"1982","unstructured":"Allen, J.R.L. 1982. Sedimentary Structures, their Character and Physical Basis. Vol. 2. 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