Ihlathi lefosili eliquka imithi yefosili (eyaziwa ngokuba yiCalamophyton), kunye nezakhiwo zentlenga ezibangelwa zizityalo ziye zafunyanwa kumawa aphezulu entlabathi ngakunxweme lweDevon kunye neSomerset kuMzantsi-ntshona. eNgilani. Oku kususela kwi-390 yezigidi zeminyaka eyadlulayo nto leyo eyenza ukuba libe lelona hlathi lidala laziwa ngeefosili umhlaba.
Esinye seziganeko eziphambili kwimbali ye umhlaba kukugawulwa kwamahlathi okanye ukutshintshela ehlathini iplanethi kulandela ukuvela kwemithi kunye namahlathi kuMbindi-Kamva weDevonian Period, 393–359 yezigidi zeminyaka eyadlulayo. Ubungakanani bezityalo zomthi ngokusisiseko zatshintsha umhlaba ngokwendalo ngokwemiqathango yokuzinziswa kwentlenga kumathafa esikhukula, imveliso yezimbiwa zodongwe, amazinga emozulu, iCO.2 ukwehla, kunye nomjikelo we-hydrological. Olu tshintsho lube nefuthe elikhulu kwikamva le umhlaba.
Ezona mithi zamandulo zokuma simahla zeyeCladoxylopsida yavela ekuqaleni kweMid-Devonian. I imithi ye-cladoxylopsid (calamophyton) yayi i-woody encinci xa ithelekiswa ne-lignophytes yokuqala ye-archaeopteridalean (i-archaeopteris) eyavela kamva ekupheleni kwe-Mid-Devonian. Ukusukela ekupheleni kwe-Mid-Devonian, i-woody lignophytes flora yaqala ukulawula umhlaba (i-lignophytes zizityalo ze-vascular ezivelisa iinkuni ezomeleleyo nge-cambium).
Kuphononongo lwakutsha nje, abaphandi bachonge indawo yehlathi yaseMid-Dovinian cladoxylopsid eyayingabonwa ngaphambili kwiHangman Sandstone Formation yaseSomerset kunye neDevon kuMazantsi-ntshona. eNgilani. Le ndawo inemithi yefosili emileyo okanye ihlathi lefosili elaqala kwi-390 yezigidi zeminyaka eyadlulayo nto leyo eyenza ukuba libe lelona hlathi lidala lefosili elaziwa kulo. umhlaba - malunga nezigidi ezine zeminyaka ubudala kunehlathi langaphambili lefosili elifunyenwe kwiLizwe laseNew York. Uphononongo lunika ukukhanya kwimpembelelo yawona mahlathi amadala.
The cladoxylopsid imithi yayifana nemithi yesundu kodwa yayingenamagqabi. Kunokuba ibe ngamaplanga aqinileyo, iziqu zawo zazibhityile yaye zinomgongxo embindini yaye amasebe awo ayegqunywe ngamakhulu ezakhiwo ezinjengamasetyana ezaziwa phantsi kwehlathi njengoko umthi ukhula. Imithi yenza amahlathi ashinyeneyo anentabalala yobutyobo bezityalo emgangathweni. Kwakungekho kukhula emgangathweni njengoko ingca yayingekabikho kodwa inqwaba yelindle kwimithi exineneyo ibe nempembelelo enkulu. Obu butyobo babuxhasa ubomi bezilwanyana ezingenamqolo emgangathweni. Intlenga emgangathweni yaba nefuthe lokuqukuqela kwemilambo nokomelela kwisikhukula. Eli yayilixesha lokuqala kwimbali ye umhlaba ukuba utshintsho oluqhutywa yimithi luphembelele indlela yemilambo kunye neendawo ezingezizo zaselwandle iplanethi itshintshe ngonaphakade.
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Imbekiselo:
- UDavies NS, McMahon WJ, kunye noBerry CM, 2024. Umhlaba elona hlathi lakudala: imithi yefosili kunye nezityalo-eziye zavela kwintlenga ephuma kwi-Middle Devonian (Eifelian) iHangman Sandstone Formation, Somerset and Devon, SW England. Ijenali yeGeological Society. 23 February 2024. DOI: https://doi.org/10.1144/jgs2023-204
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