Ua ʻike ʻia kahi ululāʻau mōʻalihaku i loko o nā kumulāʻau mōʻalihaku (ʻike ʻia ʻo Calamophyton), a ua ʻike ʻia nā hale sedimentary i hoʻoulu ʻia i nā mea kanu ma nā pali pōhaku kiʻekiʻe ma ke kahakai ʻo Devon a me Somerset o ke komohana hema. ʻEnelani. ʻO kēia ka lā mai 390 miliona mau makahiki i hala aku nei a ʻo ia ka nahele mōʻalihaku kahiko loa honua.
ʻO kekahi o nā hanana nui i ka moʻolelo o honua ʻo ka ulu lāʻau a i ʻole ka hoʻololi ʻana i ka ululāʻau Honua ma hope o ka ulu ʻana o nā kumulāʻau a me nā ululāʻau i ka Mid-Late Devonian Period, 393–359 miliona mau makahiki i hala. Ua hoʻololi maoli ka nui o nā kumulāʻau i ka biosphere ʻāina ma ke ʻano o ka hoʻopaʻa ʻana o nā sediment ma nā pā kahawai, ka hana ʻana i ka mineral pālolo, ka nui o ka wā, CO.2 drawdown, a me ka pōʻai hydrological. He hopena nui kēia mau hoʻololi i ka wā e hiki mai ana o honua.
ʻO nā kumu lāʻau mōʻalihaku kūʻokoʻa mua loa no ka Cladoxylopsida i ulu ʻia ma Mid-Devonian. ʻO ka ʻO nā kumu lāʻau cladoxylopsid (calamophyton). ʻoi aku ka liʻiliʻi o ka lāʻau i hoʻohālikelike ʻia me nā lignophytes archaeopteridalean kahiko (archaeopteris) i ulu ma hope ma ka hopena o Mid-Devonian. Mai ka hopena o Mid-Devonian, ua hoʻomaka ka ulu lāʻau lignophytes flora i ka ʻāina (ʻo nā lignophytes nā mea kanu vascular e hoʻoulu i ka lāʻau ikaika ma o ka cambium).
I loko o kahi noiʻi hou, ua ʻike ka poʻe noiʻi i kahi ʻāina ulu lāʻau cladoxylopsid Mid-Dovinian i ʻike mua ʻole ʻia ma ka Hangman Sandstone Formation o Somerset a me Devon ma Southwest. ʻEnelani. Loaʻa i ka pūnaewele nā kumulāʻau mōʻalihaku kū ʻole a i ʻole ka nahele mōʻalihaku mai 390 miliona mau makahiki i hala aku nei a ʻo ia ka nahele mōʻalihaku kahiko loa i ʻike ʻia ma honua - ma kahi o ʻehā miliona mau makahiki i ʻoi aku ma mua o ka nahele mōʻalihaku mea paʻa moʻolelo i loaʻa ma New York State. Hōʻike ka haʻawina i ka hopena o nā ululāʻau kahiko loa.
ka cladoxylopsid Ua like nā lāʻau me nā lāʻau pāma akā ʻaʻohe lau. Ma kahi o ka lāʻau paʻa, ua lahilahi ko lākou mau kumu a ua hakahaka i waenakonu a ua uhi ʻia ko lākou mau lālā i nā haneli haneli like me nā kumu lāʻau i hāʻule i ka papahele o ka ulu lāʻau i ka ulu ʻana o ka lāʻau. Hoʻokumu nā kumulāʻau i nā ululāʻau paʻa me ka nui loa o nā ʻōpala mea kanu ma ka papahele. ʻAʻohe ulu ma ka papahele no ka mea ʻaʻole i ulu ka mauʻu akā ʻo ka nui o nā kulu o nā kumu lāʻau paʻa i ka hopena nui. Kākoʻo ka ʻōpala i ke ola ʻole o ka papahele. ʻO ka lepo ma luna o ka papahele i hoʻololi i ke kahe o nā kahawai a me ka hoʻoikaika ʻana i nā kahe. ʻO kēia ka manawa mua ma ka moʻolelo o honua ua hoʻololi nā hoʻololi lāʻau i ke ala o nā kahawai a me nā ʻāina ʻaʻole kai o ka Honua hoololi mau.
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Reference:
- ʻO Davies NS, McMahon WJ, a me Berry CM, 2024. Honua ka ululāʻau mua loa: nā kumu lāʻau fossilized a me nā mea kanu-induced sedimentary structures mai ka Middle Devonian (Eifelian) Hangman Sandstone Formation, Somerset and Devon, SW England. Ka Nupepa o ka Hui Geological. 23 Pepeluali 2024. DOI: https://doi.org/10.1144/jgs2023-204
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, and vegetation-induced sedimentary structures has been discovered in the high sandstone cliffs along the Devon and Somerset coast of Southwest England. This dates from 390 million years ago which makes it the oldest known fossil forest on Earth.){kind=link}