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Late Triassic and Middle Jurassic floral changes in the Central and Central-East Iran | ||
| Geopersia | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 17 خرداد 1405 | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/geope.2026.409457.648859 | ||
| نویسنده | ||
| Fatemeh Vaez-Javadi* | ||
| Faculty of Geology, College of Science, University of Tehran, Tehran | ||
| چکیده | ||
| Upper Triassic and Middle Jurassic deposits in the central and central east of Iran contain diverse and well-preserved plant macrofossils. The data were collected from 23 localities; four investigated in the present study, 19 in other localities in the Tabas Block, five in the Kerman Basin, and one in Shahreza. Analysis of the composition of plant communities in the Ghadir Member of the Nayband Formation (Upper Triassic) and the Hojedk Formation (Middle Jurassic) indicates significant changes in their floral composition. Based on fossil evidence and statistical analyses, it is evident that genera Clathropteris Brongniart and Thaumatopteris Goeppert (Family Dipteridaceae of Filicales) disappeared in the Middle Jurassic deposits, while Klukia Raciborski and Coniopteris Brongniart of families Schizaeaceae and Dicksoniaceae appeared and became widespread. In addition, the diversity and abundance of the representatives of the Order Bennettitales decreased significantly, such that Zamites Brongniart and Nilssoniopteris Nathorst were absent by the end of the Middle Jurassic. The Cycadales flourished by genus Nilssonia Brongniart and expanded with numerous species in these areas. Among the seed ferns, the Peltaspermales with the genus Scytophyllum Bornemann disappeared in the Middle Jurassic, and instead, the Caytoniales and Corystospermales with the genera of Sagenopteris Presl and Pachypteris appeared. Moreover, in the Middle Jurassic, small-leaved conifers such as Elatides Heer emend. Harris and Cyparissidium Heer became abundant and spread in the central and central eastern Iran. | ||
| کلیدواژهها | ||
| Late Triassic؛ Middle Jurassic؛ Fossil floral changes؛ Central and Central-East Iran | ||
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