Document Type : Original Research Paper

Authors

1 Professor Assistant in Department of Geology, University of Tehran

2 Master of Science of Geology, University of Tehran

10.22071/gsj.2022.307599.1937

Abstract

Plant macrofossils of Hojedk Formation were studied in a well of the Mazino region, southwest of Tabas, so that 29 species of plant macrofossils belonging to 15 genera of various orders were identified. One local interval biozone- Ptilophyllum harrisianum-Klukia exilis Interval zone were recognized. Based on the occurrences of the Equisetites sp. cf. E. beanii, Klukia exilis, Ptilophyllum harrisianum, Nilssonia macrophylla, and Elatides thomasii, an early Middle Jurassic (Aalenian-Bajocian) age is considered for this plant macrofossil assemblage. The relative abundance of Filicales (ferns), Cycadales, Pinales, and Equisetales are 43.18, 31.82, 13.63, and 4.64, respectively. Moreover, the results of similarity indices of plant macrofossils indicate relatively strong value of similarity between the plant macrofossil assemblage of the Mazino area and elsewhere in Tabas Block. Besides, floral gradient score of this assemblage is 54.89. Based on the paleontological and lithological evidences, a humid ‘warm temperate biome’ is considered for this locality. Moreover, it is confirmed that a uniform vegetation and palaeoclimate occurred in Tabas Block during the Middle Jurassic and that Iran was located within Vakhrameev’s Euro-Sinian region, Transcaspian subprovince.

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