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However, evaluating the origin of morphological features in the rock record can be problematic because naturally occurring abiotic structures can resemble biological morphologies, which may lead to false\u2010positive detections of fossilised life. Iron\u2010mineralised chemical gardens have been highlighted as potentially confounding abiotic structures because of their morphological and chemical resemblance to biomineralised filaments. Despite this, the potential for chemical garden structures to be preserved in the fossil record has not been thoroughly investigated. Here, we subjected abiotic iron\u2010mineralised chemical garden structures to artificial maturation using hydrous pyrolysis, in order to evaluate their preservation potential. We found that these abiotic filaments were relatively resistant to degradation caused by maturation when compared with analogous biological material. Additionally, the transformation of ferrihydrite to crystalline iron oxides was found to be relatively inhibited, likely because of the influence of silica. These findings highlight the need for fossilised filamentous material to be distinguished from chemical garden structures before a biological origin can be confidently attributed, particularly when observed in significantly altered rocks.<\/jats:p>","DOI":"10.1111\/gbi.70045","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T03:19:37Z","timestamp":1776827977000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tricks of Nature From the Ancient Earth and Early Mars: Chemical Gardens Generate Biomorphs With High Preservation Potential"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-7856-8495","authenticated-orcid":false,"given":"Solomon","family":"Hirsch","sequence":"first","affiliation":[{"name":"Department of Earth Science and Engineering Imperial College London  London 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